diff --git a/java/change-notes/2021-05-11-apache-tuples.md b/java/change-notes/2021-05-11-apache-tuples.md
new file mode 100644
index 00000000000..2eab20ecd4f
--- /dev/null
+++ b/java/change-notes/2021-05-11-apache-tuples.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Added models for the Apache Commons Lang tuple types (Pair, Triple and their immutable and mutable implementations). This may lead to more results from any query using data-flow analysis where a relevant path uses one of these container types.
diff --git a/java/ql/src/semmle/code/java/dataflow/internal/FlowSummaryImplSpecific.qll b/java/ql/src/semmle/code/java/dataflow/internal/FlowSummaryImplSpecific.qll
index d28dd2206ac..974982a9c29 100644
--- a/java/ql/src/semmle/code/java/dataflow/internal/FlowSummaryImplSpecific.qll
+++ b/java/ql/src/semmle/code/java/dataflow/internal/FlowSummaryImplSpecific.qll
@@ -70,9 +70,22 @@ predicate summaryElement(DataFlowCallable c, string input, string output, string
   )
 }
 
+private FieldContent parseField(string c) {
+  External::specSplit(_, c, _) and
+  exists(string fieldRegex, string package, string className, string fieldName |
+    fieldRegex = "^Field\\[(.*)\\.([^.]+)\\.([^.]+)\\]$" and
+    package = c.regexpCapture(fieldRegex, 1) and
+    className = c.regexpCapture(fieldRegex, 2) and
+    fieldName = c.regexpCapture(fieldRegex, 3) and
+    result.getField().hasQualifiedName(package, className, fieldName)
+  )
+}
+
 /** Gets the summary component for specification component `c`, if any. */
 bindingset[c]
 SummaryComponent interpretComponentSpecific(string c) {
+  result = SummaryComponent::content(parseField(c))
+  or
   c = "ArrayElement" and result = SummaryComponent::content(any(ArrayContent c0))
   or
   c = "Element" and result = SummaryComponent::content(any(CollectionContent c0))
diff --git a/java/ql/src/semmle/code/java/frameworks/apache/Lang.qll b/java/ql/src/semmle/code/java/frameworks/apache/Lang.qll
index 38469bf6b76..bf47d627686 100644
--- a/java/ql/src/semmle/code/java/frameworks/apache/Lang.qll
+++ b/java/ql/src/semmle/code/java/frameworks/apache/Lang.qll
@@ -789,3 +789,72 @@ private class ApacheToStringBuilderModel extends SummaryModelCsv {
       ]
   }
 }
+
+/**
+ * Value-propagating models for `Pair`, `ImmutablePair` and `MutablePair`.
+ */
+private class ApachePairModel extends SummaryModelCsv {
+  override predicate row(string row) {
+    row =
+      [
+        "org.apache.commons.lang3.tuple;Pair;false;getKey;;;Field[org.apache.commons.lang3.tuple.ImmutablePair.left] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Pair;false;getValue;;;Field[org.apache.commons.lang3.tuple.ImmutablePair.right] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Pair;false;getKey;;;Field[org.apache.commons.lang3.tuple.MutablePair.left] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Pair;false;getValue;;;Field[org.apache.commons.lang3.tuple.MutablePair.right] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Pair;false;of;(java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutablePair.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Pair;false;of;(java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.ImmutablePair.right] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;ImmutablePair;(java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutablePair.left] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;ImmutablePair;(java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.ImmutablePair.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;getLeft;;;Field[org.apache.commons.lang3.tuple.ImmutablePair.left] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;getRight;;;Field[org.apache.commons.lang3.tuple.ImmutablePair.right] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;left;;;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutablePair.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;right;;;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutablePair.right] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;of;(java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutablePair.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutablePair;false;of;(java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.ImmutablePair.right] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;MutablePair;(java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.MutablePair.left] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;MutablePair;(java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.MutablePair.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;getLeft;;;Field[org.apache.commons.lang3.tuple.MutablePair.left] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;getRight;;;Field[org.apache.commons.lang3.tuple.MutablePair.right] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;setLeft;;;Argument[0];Field[org.apache.commons.lang3.tuple.MutablePair.left] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;setRight;;;Argument[0];Field[org.apache.commons.lang3.tuple.MutablePair.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;setValue;;;Argument[0];Field[org.apache.commons.lang3.tuple.MutablePair.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;of;(java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.MutablePair.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutablePair;false;of;(java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.MutablePair.right] of ReturnValue;value"
+      ]
+  }
+}
+
+/**
+ * Value-propagating models for `Triple`, `ImmutableTriple` and `MutableTriple`.
+ */
+private class ApacheTripleModel extends SummaryModelCsv {
+  override predicate row(string row) {
+    row =
+      [
+        "org.apache.commons.lang3.tuple;Triple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutableTriple.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Triple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.ImmutableTriple.middle] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;Triple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[2];Field[org.apache.commons.lang3.tuple.ImmutableTriple.right] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;ImmutableTriple;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutableTriple.left] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;ImmutableTriple;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.ImmutableTriple.middle] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;ImmutableTriple;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[2];Field[org.apache.commons.lang3.tuple.ImmutableTriple.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;getLeft;;;Field[org.apache.commons.lang3.tuple.ImmutableTriple.left] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;getMiddle;;;Field[org.apache.commons.lang3.tuple.ImmutableTriple.middle] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;getRight;;;Field[org.apache.commons.lang3.tuple.ImmutableTriple.right] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.ImmutableTriple.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.ImmutableTriple.middle] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;ImmutableTriple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[2];Field[org.apache.commons.lang3.tuple.ImmutableTriple.right] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;MutableTriple;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.MutableTriple.left] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;MutableTriple;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.MutableTriple.middle] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;MutableTriple;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[2];Field[org.apache.commons.lang3.tuple.MutableTriple.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;getLeft;;;Field[org.apache.commons.lang3.tuple.MutableTriple.left] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;getMiddle;;;Field[org.apache.commons.lang3.tuple.MutableTriple.middle] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;getRight;;;Field[org.apache.commons.lang3.tuple.MutableTriple.right] of Argument[-1];ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;setLeft;;;Argument[0];Field[org.apache.commons.lang3.tuple.MutableTriple.left] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;setMiddle;;;Argument[0];Field[org.apache.commons.lang3.tuple.MutableTriple.middle] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;setRight;;;Argument[0];Field[org.apache.commons.lang3.tuple.MutableTriple.right] of Argument[-1];value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[0];Field[org.apache.commons.lang3.tuple.MutableTriple.left] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[1];Field[org.apache.commons.lang3.tuple.MutableTriple.middle] of ReturnValue;value",
+        "org.apache.commons.lang3.tuple;MutableTriple;false;of;(java.lang.Object,java.lang.Object,java.lang.Object);;Argument[2];Field[org.apache.commons.lang3.tuple.MutableTriple.right] of ReturnValue;value"
+      ]
+  }
+}
diff --git a/java/ql/test/library-tests/frameworks/apache-commons-lang3/PairTest.java b/java/ql/test/library-tests/frameworks/apache-commons-lang3/PairTest.java
new file mode 100644
index 00000000000..6db15beb181
--- /dev/null
+++ b/java/ql/test/library-tests/frameworks/apache-commons-lang3/PairTest.java
@@ -0,0 +1,150 @@
+import org.apache.commons.lang3.tuple.Pair;
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.MutablePair;
+
+class PairTest {
+    String taint() { return "tainted"; }
+
+    private static class IntSource {
+      static int taint() { return 0; }
+    }
+
+    void sink(Object o) {}
+
+    void test() throws Exception {
+
+      ImmutablePair<String, String> taintedLeft = ImmutablePair.of(taint(), "clean-right");
+      ImmutablePair<String, String> taintedRight = ImmutablePair.of("clean-left", taint());
+      Pair<String, String> taintedLeft2_ = ImmutablePair.left(taint());
+      ImmutablePair<String, String> taintedLeft2 = (ImmutablePair)taintedLeft2_;
+      Pair<String, String> taintedRight2_ = ImmutablePair.right(taint());
+      ImmutablePair<String, String> taintedRight2 = (ImmutablePair)taintedRight2_;
+      Pair<String, String> taintedLeft3 = Pair.of(taint(), "clean-right");
+      Pair<String, String> taintedRight3 = Pair.of("clean-left", taint());
+      ImmutablePair<String, String> taintedLeft4 = new ImmutablePair(taint(), "clean-right");
+      ImmutablePair<String, String> taintedRight4 = new ImmutablePair("clean-left", taint());
+
+      // Check flow through ImmutablePairs:
+      sink(taintedLeft.getLeft()); // $hasValueFlow
+      sink(taintedLeft.getRight());
+      sink(taintedLeft.getKey()); // $hasValueFlow
+      sink(taintedLeft.getValue());
+      sink(taintedLeft.left); // $hasValueFlow
+      sink(taintedLeft.right);
+      sink(taintedRight.getLeft());
+      sink(taintedRight.getRight()); // $hasValueFlow
+      sink(taintedRight.getKey());
+      sink(taintedRight.getValue()); // $hasValueFlow
+      sink(taintedRight.left);
+      sink(taintedRight.right); // $hasValueFlow
+      sink(taintedLeft2.getLeft()); // $hasValueFlow
+      sink(taintedLeft2.getRight());
+      sink(taintedLeft2.getKey()); // $hasValueFlow
+      sink(taintedLeft2.getValue());
+      sink(taintedLeft2.left); // $hasValueFlow
+      sink(taintedLeft2.right);
+      sink(taintedRight2.getLeft());
+      sink(taintedRight2.getRight()); // $hasValueFlow
+      sink(taintedRight2.getKey());
+      sink(taintedRight2.getValue()); // $hasValueFlow
+      sink(taintedRight2.left);
+      sink(taintedRight2.right); // $hasValueFlow
+      sink(taintedLeft3.getLeft()); // $hasValueFlow
+      sink(taintedLeft3.getRight());
+      sink(taintedLeft3.getKey()); // $hasValueFlow
+      sink(taintedLeft3.getValue());
+      sink(taintedRight3.getLeft());
+      sink(taintedRight3.getRight()); // $hasValueFlow
+      sink(taintedRight3.getKey());
+      sink(taintedRight3.getValue()); // $hasValueFlow
+      sink(taintedLeft4.getLeft()); // $hasValueFlow
+      sink(taintedLeft4.getRight());
+      sink(taintedLeft4.getKey()); // $hasValueFlow
+      sink(taintedLeft4.getValue());
+      sink(taintedLeft4.left); // $hasValueFlow
+      sink(taintedLeft4.right);
+      sink(taintedRight4.getLeft());
+      sink(taintedRight4.getRight()); // $hasValueFlow
+      sink(taintedRight4.getKey());
+      sink(taintedRight4.getValue()); // $hasValueFlow
+      sink(taintedRight4.left);
+      sink(taintedRight4.right); // $hasValueFlow
+
+      // Check flow also works via an alias of type Pair:
+      sink(taintedLeft2_.getLeft()); // $hasValueFlow
+      sink(taintedLeft2_.getRight());
+      sink(taintedLeft2_.getKey()); // $hasValueFlow
+      sink(taintedLeft2_.getValue());
+      sink(taintedRight2_.getLeft());
+      sink(taintedRight2_.getRight()); // $hasValueFlow
+      sink(taintedRight2_.getKey());
+      sink(taintedRight2_.getValue()); // $hasValueFlow
+
+      // Check flow through MutablePairs:
+      MutablePair<String, String> taintedLeftMutable = MutablePair.of(taint(), "clean-right");
+      MutablePair<String, String> taintedRightMutable = MutablePair.of("clean-left", taint());
+      MutablePair<String, String> setTaintLeft = MutablePair.of("clean-left", "clean-right");
+      setTaintLeft.setLeft(taint());
+      MutablePair<String, String> setTaintRight = MutablePair.of("clean-left", "clean-right");
+      setTaintRight.setRight(taint());
+      MutablePair<String, String> setTaintValue = MutablePair.of("clean-left", "clean-right");
+      setTaintValue.setValue(taint());
+      MutablePair<String, String> taintedLeftMutableConstructed = new MutablePair(taint(), "clean-right");
+      MutablePair<String, String> taintedRightMutableConstructed = new MutablePair("clean-left", taint());
+
+      sink(taintedLeftMutable.getLeft()); // $hasValueFlow
+      sink(taintedLeftMutable.getRight());
+      sink(taintedLeftMutable.getKey()); // $hasValueFlow
+      sink(taintedLeftMutable.getValue());
+      sink(taintedLeftMutable.left); // $hasValueFlow
+      sink(taintedLeftMutable.right);
+      sink(taintedRightMutable.getLeft());
+      sink(taintedRightMutable.getRight()); // $hasValueFlow
+      sink(taintedRightMutable.getKey());
+      sink(taintedRightMutable.getValue()); // $hasValueFlow
+      sink(taintedRightMutable.left);
+      sink(taintedRightMutable.right); // $hasValueFlow
+      sink(setTaintLeft.getLeft()); // $hasValueFlow
+      sink(setTaintLeft.getRight());
+      sink(setTaintLeft.getKey()); // $hasValueFlow
+      sink(setTaintLeft.getValue());
+      sink(setTaintLeft.left); // $hasValueFlow
+      sink(setTaintLeft.right);
+      sink(setTaintRight.getLeft());
+      sink(setTaintRight.getRight()); // $hasValueFlow
+      sink(setTaintRight.getKey());
+      sink(setTaintRight.getValue()); // $hasValueFlow
+      sink(setTaintRight.left);
+      sink(setTaintRight.right); // $hasValueFlow
+      sink(setTaintValue.getLeft());
+      sink(setTaintValue.getRight()); // $hasValueFlow
+      sink(setTaintValue.getKey());
+      sink(setTaintValue.getValue()); // $hasValueFlow
+      sink(setTaintValue.left);
+      sink(setTaintValue.right); // $hasValueFlow
+      sink(taintedLeftMutableConstructed.getLeft()); // $hasValueFlow
+      sink(taintedLeftMutableConstructed.getRight());
+      sink(taintedLeftMutableConstructed.getKey()); // $hasValueFlow
+      sink(taintedLeftMutableConstructed.getValue());
+      sink(taintedLeftMutableConstructed.left); // $hasValueFlow
+      sink(taintedLeftMutableConstructed.right);
+      sink(taintedRightMutableConstructed.getLeft());
+      sink(taintedRightMutableConstructed.getRight()); // $hasValueFlow
+      sink(taintedRightMutableConstructed.getKey());
+      sink(taintedRightMutableConstructed.getValue()); // $hasValueFlow
+      sink(taintedRightMutableConstructed.left);
+      sink(taintedRightMutableConstructed.right); // $hasValueFlow
+
+      // Check flow also works via an alias of type Pair:
+      Pair<String, String> taintedLeftMutableAlias = taintedLeftMutable;
+      Pair<String, String> taintedRightMutableAlias = taintedRightMutable;
+      sink(taintedLeftMutableAlias.getLeft()); // $hasValueFlow
+      sink(taintedLeftMutableAlias.getRight());
+      sink(taintedLeftMutableAlias.getKey()); // $hasValueFlow
+      sink(taintedLeftMutableAlias.getValue());
+      sink(taintedRightMutableAlias.getLeft());
+      sink(taintedRightMutableAlias.getRight()); // $hasValueFlow
+      sink(taintedRightMutableAlias.getKey());
+      sink(taintedRightMutableAlias.getValue()); // $hasValueFlow
+    }
+}
\ No newline at end of file
diff --git a/java/ql/test/library-tests/frameworks/apache-commons-lang3/TripleTest.java b/java/ql/test/library-tests/frameworks/apache-commons-lang3/TripleTest.java
new file mode 100644
index 00000000000..b6f9c53cc7e
--- /dev/null
+++ b/java/ql/test/library-tests/frameworks/apache-commons-lang3/TripleTest.java
@@ -0,0 +1,181 @@
+import org.apache.commons.lang3.tuple.Triple;
+import org.apache.commons.lang3.tuple.ImmutableTriple;
+import org.apache.commons.lang3.tuple.MutableTriple;
+
+class TripleTest {
+    String taint() { return "tainted"; }
+
+    private static class IntSource {
+      static int taint() { return 0; }
+    }
+
+    void sink(Object o) {}
+
+    void test() throws Exception {
+
+      ImmutableTriple<String, String, String> taintedLeft = ImmutableTriple.of(taint(), "clean-middle", "clean-right");
+      ImmutableTriple<String, String, String> taintedMiddle = ImmutableTriple.of("clean-left", taint(), "clean-right");
+      ImmutableTriple<String, String, String> taintedRight = ImmutableTriple.of("clean-left", "clean-middle", taint());
+
+      // Check flow through ImmutableTriples:
+      sink(taintedLeft.getLeft()); // $hasValueFlow
+      sink(taintedLeft.getMiddle());
+      sink(taintedLeft.getRight());
+      sink(taintedLeft.left); // $hasValueFlow
+      sink(taintedLeft.middle);
+      sink(taintedLeft.right);
+      sink(taintedMiddle.getLeft());
+      sink(taintedMiddle.getMiddle()); // $hasValueFlow
+      sink(taintedMiddle.getRight());
+      sink(taintedMiddle.left);
+      sink(taintedMiddle.middle); // $hasValueFlow
+      sink(taintedMiddle.right);
+      sink(taintedRight.getLeft());
+      sink(taintedRight.getMiddle());
+      sink(taintedRight.getRight()); // $hasValueFlow
+      sink(taintedRight.left);
+      sink(taintedRight.middle);
+      sink(taintedRight.right); // $hasValueFlow
+
+      Triple<String, String, String> taintedLeft2 = taintedLeft;
+      Triple<String, String, String> taintedMiddle2 = taintedMiddle;
+      Triple<String, String, String> taintedRight2 = taintedRight;
+
+      // Check flow also works via an alias of type Triple:
+      sink(taintedLeft2.getLeft()); // $hasValueFlow
+      sink(taintedLeft2.getMiddle());
+      sink(taintedLeft2.getRight());
+      sink(taintedMiddle2.getLeft());
+      sink(taintedMiddle2.getMiddle()); // $hasValueFlow
+      sink(taintedMiddle2.getRight());
+      sink(taintedRight2.getLeft());
+      sink(taintedRight2.getMiddle());
+      sink(taintedRight2.getRight()); // $hasValueFlow
+
+      // Check flow via Triple.of:
+      Triple<String, String, String> taintedLeft3 = Triple.of(taint(), "clean-middle", "clean-right");
+      Triple<String, String, String> taintedMiddle3 = Triple.of("clean-left", taint(), "clean-right");
+      Triple<String, String, String> taintedRight3 = Triple.of("clean-left", "clean-middle", taint());
+
+      sink(taintedLeft3.getLeft()); // $hasValueFlow
+      sink(taintedLeft3.getMiddle());
+      sink(taintedLeft3.getRight());
+      sink(taintedMiddle3.getLeft());
+      sink(taintedMiddle3.getMiddle()); // $hasValueFlow
+      sink(taintedMiddle3.getRight());
+      sink(taintedRight3.getLeft());
+      sink(taintedRight3.getMiddle());
+      sink(taintedRight3.getRight()); // $hasValueFlow
+
+      // Check flow via constructor:
+      ImmutableTriple<String, String, String> taintedLeft4 = new ImmutableTriple(taint(), "clean-middle", "clean-right");
+      ImmutableTriple<String, String, String> taintedMiddle4 = new ImmutableTriple("clean-left", taint(), "clean-right");
+      ImmutableTriple<String, String, String> taintedRight4 = new ImmutableTriple("clean-left", "clean-middle", taint());
+
+      sink(taintedLeft4.getLeft()); // $hasValueFlow
+      sink(taintedLeft4.getMiddle());
+      sink(taintedLeft4.getRight());
+      sink(taintedMiddle4.getLeft());
+      sink(taintedMiddle4.getMiddle()); // $hasValueFlow
+      sink(taintedMiddle4.getRight());
+      sink(taintedRight4.getLeft());
+      sink(taintedRight4.getMiddle());
+      sink(taintedRight4.getRight()); // $hasValueFlow
+
+      MutableTriple<String, String, String> mutableTaintedLeft = MutableTriple.of(taint(), "clean-middle", "clean-right");
+      MutableTriple<String, String, String> mutableTaintedMiddle = MutableTriple.of("clean-left", taint(), "clean-right");
+      MutableTriple<String, String, String> mutableTaintedRight = MutableTriple.of("clean-left", "clean-middle", taint());
+      MutableTriple<String, String, String> setTaintedLeft = MutableTriple.of("clean-left", "clean-middle", "clean-right");
+      setTaintedLeft.setLeft(taint());
+      MutableTriple<String, String, String> setTaintedMiddle = MutableTriple.of("clean-left", "clean-middle", "clean-right");
+      setTaintedMiddle.setMiddle(taint());
+      MutableTriple<String, String, String> setTaintedRight = MutableTriple.of("clean-left", "clean-middle", "clean-right");
+      setTaintedRight.setRight(taint());
+      MutableTriple<String, String, String> mutableTaintedLeftConstructed = new MutableTriple(taint(), "clean-middle", "clean-right");
+      MutableTriple<String, String, String> mutableTaintedMiddleConstructed = new MutableTriple("clean-left", taint(), "clean-right");
+      MutableTriple<String, String, String> mutableTaintedRightConstructed = new MutableTriple("clean-left", "clean-middle", taint());
+
+      // Check flow through MutableTriples:
+      sink(mutableTaintedLeft.getLeft()); // $hasValueFlow
+      sink(mutableTaintedLeft.getMiddle());
+      sink(mutableTaintedLeft.getRight());
+      sink(mutableTaintedLeft.left); // $hasValueFlow
+      sink(mutableTaintedLeft.middle);
+      sink(mutableTaintedLeft.right);
+      sink(mutableTaintedMiddle.getLeft());
+      sink(mutableTaintedMiddle.getMiddle()); // $hasValueFlow
+      sink(mutableTaintedMiddle.getRight());
+      sink(mutableTaintedMiddle.left);
+      sink(mutableTaintedMiddle.middle); // $hasValueFlow
+      sink(mutableTaintedMiddle.right);
+      sink(mutableTaintedRight.getLeft());
+      sink(mutableTaintedRight.getMiddle());
+      sink(mutableTaintedRight.getRight()); // $hasValueFlow
+      sink(mutableTaintedRight.left);
+      sink(mutableTaintedRight.middle);
+      sink(mutableTaintedRight.right); // $hasValueFlow
+      sink(setTaintedLeft.getLeft()); // $hasValueFlow
+      sink(setTaintedLeft.getMiddle());
+      sink(setTaintedLeft.getRight());
+      sink(setTaintedLeft.left); // $hasValueFlow
+      sink(setTaintedLeft.middle);
+      sink(setTaintedLeft.right);
+      sink(setTaintedMiddle.getLeft());
+      sink(setTaintedMiddle.getMiddle()); // $hasValueFlow
+      sink(setTaintedMiddle.getRight());
+      sink(setTaintedMiddle.left);
+      sink(setTaintedMiddle.middle); // $hasValueFlow
+      sink(setTaintedMiddle.right);
+      sink(setTaintedRight.getLeft());
+      sink(setTaintedRight.getMiddle());
+      sink(setTaintedRight.getRight()); // $hasValueFlow
+      sink(setTaintedRight.left);
+      sink(setTaintedRight.middle);
+      sink(setTaintedRight.right); // $hasValueFlow
+      sink(mutableTaintedLeftConstructed.getLeft()); // $hasValueFlow
+      sink(mutableTaintedLeftConstructed.getMiddle());
+      sink(mutableTaintedLeftConstructed.getRight());
+      sink(mutableTaintedLeftConstructed.left); // $hasValueFlow
+      sink(mutableTaintedLeftConstructed.middle);
+      sink(mutableTaintedLeftConstructed.right);
+      sink(mutableTaintedMiddleConstructed.getLeft());
+      sink(mutableTaintedMiddleConstructed.getMiddle()); // $hasValueFlow
+      sink(mutableTaintedMiddleConstructed.getRight());
+      sink(mutableTaintedMiddleConstructed.left);
+      sink(mutableTaintedMiddleConstructed.middle); // $hasValueFlow
+      sink(mutableTaintedMiddleConstructed.right);
+      sink(mutableTaintedRightConstructed.getLeft());
+      sink(mutableTaintedRightConstructed.getMiddle());
+      sink(mutableTaintedRightConstructed.getRight()); // $hasValueFlow
+      sink(mutableTaintedRightConstructed.left);
+      sink(mutableTaintedRightConstructed.middle);
+      sink(mutableTaintedRightConstructed.right); // $hasValueFlow
+
+      Triple<String, String, String> mutableTaintedLeft2 = mutableTaintedLeft;
+      Triple<String, String, String> mutableTaintedMiddle2 = mutableTaintedMiddle;
+      Triple<String, String, String> mutableTaintedRight2 = mutableTaintedRight;
+      Triple<String, String, String> setTaintedLeft2 = setTaintedLeft;
+      Triple<String, String, String> setTaintedMiddle2 = setTaintedMiddle;
+      Triple<String, String, String> setTaintedRight2 = setTaintedRight;
+
+      // Check flow also works via an alias of type Triple:
+      sink(mutableTaintedLeft2.getLeft()); // $hasValueFlow
+      sink(mutableTaintedLeft2.getMiddle());
+      sink(mutableTaintedLeft2.getRight());
+      sink(mutableTaintedMiddle2.getLeft());
+      sink(mutableTaintedMiddle2.getMiddle()); // $hasValueFlow
+      sink(mutableTaintedMiddle2.getRight());
+      sink(mutableTaintedRight2.getLeft());
+      sink(mutableTaintedRight2.getMiddle());
+      sink(mutableTaintedRight2.getRight()); // $hasValueFlow
+      sink(setTaintedLeft2.getLeft()); // $hasValueFlow
+      sink(setTaintedLeft2.getMiddle());
+      sink(setTaintedLeft2.getRight());
+      sink(setTaintedMiddle2.getLeft());
+      sink(setTaintedMiddle2.getMiddle()); // $hasValueFlow
+      sink(setTaintedMiddle2.getRight());
+      sink(setTaintedRight2.getLeft());
+      sink(setTaintedRight2.getMiddle());
+      sink(setTaintedRight2.getRight()); // $hasValueFlow
+    }
+}
\ No newline at end of file
diff --git a/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/ImmutablePair.java b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/ImmutablePair.java
new file mode 100644
index 00000000000..ee4cacd78a6
--- /dev/null
+++ b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/ImmutablePair.java
@@ -0,0 +1,195 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+import java.util.Map;
+
+/**
+ * <p>An immutable pair consisting of two {@code Object} elements.</p>
+ *
+ * <p>Although the implementation is immutable, there is no restriction on the objects
+ * that may be stored. If mutable objects are stored in the pair, then the pair
+ * itself effectively becomes mutable. The class is also {@code final}, so a subclass
+ * can not add undesirable behavior.</p>
+ *
+ * <p>#ThreadSafe# if both paired objects are thread-safe</p>
+ *
+ * @param <L> the left element type
+ * @param <R> the right element type
+ *
+ * @since 3.0
+ */
+public final class ImmutablePair<L, R> extends Pair<L, R> {
+
+    /**
+     * An empty array.
+     * <p>
+     * Consider using {@link #emptyArray()} to avoid generics warnings.
+     * </p>
+     *
+     * @since 3.10.
+     */
+    public static final ImmutablePair<?, ?>[] EMPTY_ARRAY = null;
+
+    /**
+     * An immutable pair of nulls.
+     */
+    // This is not defined with generics to avoid warnings in call sites.
+    @SuppressWarnings("rawtypes")
+    private static final ImmutablePair NULL = null;
+
+    /** Serialization version */
+    private static final long serialVersionUID = 4954918890077093841L;
+
+    /**
+     * Returns the empty array singleton that can be assigned without compiler warning.
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @return the empty array singleton that can be assigned without compiler warning.
+     *
+     * @since 3.10.
+     */
+    @SuppressWarnings("unchecked")
+    public static <L, R> ImmutablePair<L, R>[] emptyArray() {
+        return null;
+    }
+
+    /**
+     * <p>Creates an immutable pair of two objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @return a pair formed from the two parameters, not null
+     * @since 3.11
+     */
+    public static <L, R> Pair<L, R> left(final L left) {
+        return null;
+    }
+
+    /**
+     * Returns an immutable pair of nulls.
+     *
+     * @param <L> the left element of this pair. Value is {@code null}.
+     * @param <R> the right element of this pair. Value is {@code null}.
+     * @return an immutable pair of nulls.
+     * @since 3.6
+     */
+    public static <L, R> ImmutablePair<L, R> nullPair() {
+        return null;
+    }
+
+    /**
+     * <p>Creates an immutable pair of two objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param right  the right element, may be null
+     * @return a pair formed from the two parameters, not null
+     */
+    public static <L, R> ImmutablePair<L, R> of(final L left, final R right) {
+        return null;
+    }
+
+    /**
+     * <p>Creates an immutable pair from an existing pair.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param pair the existing pair.
+     * @return a pair formed from the two parameters, not null
+     * @since 3.10
+     */
+    public static <L, R> ImmutablePair<L, R> of(final Map.Entry<L, R> pair) {
+        return null;
+    }
+
+    /**
+     * <p>Creates an immutable pair of two objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param right  the right element, may be null
+     * @return a pair formed from the two parameters, not null
+     * @since 3.11
+     */
+    public static <L, R> Pair<L, R> right(final R right) {
+        return null;
+    }
+
+    /** Left object */
+    public final L left;
+
+    /** Right object */
+    public final R right;
+
+    /**
+     * Create a new pair instance.
+     *
+     * @param left  the left value, may be null
+     * @param right  the right value, may be null
+     */
+    public ImmutablePair(final L left, final R right) {
+      this.left = null;
+      this.right = null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public L getLeft() {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public R getRight() {
+        return null;
+    }
+
+    /**
+     * <p>Throws {@code UnsupportedOperationException}.</p>
+     *
+     * <p>This pair is immutable, so this operation is not supported.</p>
+     *
+     * @param value  the value to set
+     * @return never
+     * @throws UnsupportedOperationException as this operation is not supported
+     */
+    @Override
+    public R setValue(final R value) {
+        return null;
+    }
+
+}
\ No newline at end of file
diff --git a/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/ImmutableTriple.java b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/ImmutableTriple.java
new file mode 100644
index 00000000000..846fcbd9052
--- /dev/null
+++ b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/ImmutableTriple.java
@@ -0,0 +1,137 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+/**
+ * <p>An immutable triple consisting of three {@code Object} elements.</p>
+ *
+ * <p>Although the implementation is immutable, there is no restriction on the objects
+ * that may be stored. If mutable objects are stored in the triple, then the triple
+ * itself effectively becomes mutable. The class is also {@code final}, so a subclass
+ * can not add undesirable behavior.</p>
+ *
+ * <p>#ThreadSafe# if all three objects are thread-safe</p>
+ *
+ * @param <L> the left element type
+ * @param <M> the middle element type
+ * @param <R> the right element type
+ *
+ * @since 3.2
+ */
+public final class ImmutableTriple<L, M, R> extends Triple<L, M, R> {
+
+    /**
+     * An empty array.
+     * <p>
+     * Consider using {@link #emptyArray()} to avoid generics warnings.
+     * </p>
+     *
+     * @since 3.10.
+     */
+    public static final ImmutableTriple<?, ?, ?>[] EMPTY_ARRAY = null;
+
+    /**
+     * Returns the empty array singleton that can be assigned without compiler warning.
+     *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
+     * @return the empty array singleton that can be assigned without compiler warning.
+     *
+     * @since 3.10.
+     */
+    @SuppressWarnings("unchecked")
+    public static <L, M, R> ImmutableTriple<L, M, R>[] emptyArray() {
+        return null;
+    }
+
+    /**
+     * Returns an immutable triple of nulls.
+     *
+     * @param <L> the left element of this triple. Value is {@code null}.
+     * @param <M> the middle element of this triple. Value is {@code null}.
+     * @param <R> the right element of this triple. Value is {@code null}.
+     * @return an immutable triple of nulls.
+     * @since 3.6
+     */
+    public static <L, M, R> ImmutableTriple<L, M, R> nullTriple() {
+        return null;
+    }
+
+    /**
+     * <p>Obtains an immutable triple of three objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the triple to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param middle  the middle element, may be null
+     * @param right  the right element, may be null
+     * @return a triple formed from the three parameters, not null
+     */
+    public static <L, M, R> ImmutableTriple<L, M, R> of(final L left, final M middle, final R right) {
+        return null;
+    }
+    /** Left object */
+    public final L left;
+    /** Middle object */
+    public final M middle;
+
+    /** Right object */
+    public final R right;
+
+    /**
+     * Create a new triple instance.
+     *
+     * @param left  the left value, may be null
+     * @param middle the middle value, may be null
+     * @param right  the right value, may be null
+     */
+    public ImmutableTriple(final L left, final M middle, final R right) {
+        this.left = null;
+        this.middle = null;
+        this.right = null;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public L getLeft() {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public M getMiddle() {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public R getRight() {
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/MutablePair.java b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/MutablePair.java
new file mode 100644
index 00000000000..5826a2145fc
--- /dev/null
+++ b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/MutablePair.java
@@ -0,0 +1,158 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+import java.util.Map;
+
+/**
+ * <p>A mutable pair consisting of two {@code Object} elements.</p>
+ *
+ * <p>Not #ThreadSafe#</p>
+ *
+ * @param <L> the left element type
+ * @param <R> the right element type
+ *
+ * @since 3.0
+ */
+public class MutablePair<L, R> extends Pair<L, R> {
+
+    /**
+     * An empty array.
+     * <p>
+     * Consider using {@link #emptyArray()} to avoid generics warnings.
+     * </p>
+     *
+     * @since 3.10.
+     */
+    public static final MutablePair<?, ?>[] EMPTY_ARRAY = null;
+
+    /**
+     * Returns the empty array singleton that can be assigned without compiler warning.
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @return the empty array singleton that can be assigned without compiler warning.
+     *
+     * @since 3.10.
+     */
+    @SuppressWarnings("unchecked")
+    public static <L, R> MutablePair<L, R>[] emptyArray() {
+        return null;
+    }
+
+    /**
+     * <p>Creates a mutable pair of two objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param right  the right element, may be null
+     * @return a pair formed from the two parameters, not null
+     */
+    public static <L, R> MutablePair<L, R> of(final L left, final R right) {
+        return null;
+    }
+
+    /**
+     * <p>Creates a mutable pair from an existing pair.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param pair the existing pair.
+     * @return a pair formed from the two parameters, not null
+     */
+    public static <L, R> MutablePair<L, R> of(final Map.Entry<L, R> pair) {
+        return null;
+    }
+
+    /** Left object */
+    public L left;
+
+    /** Right object */
+    public R right;
+
+    /**
+     * Create a new pair instance of two nulls.
+     */
+    public MutablePair() {
+    }
+
+    /**
+     * Create a new pair instance.
+     *
+     * @param left  the left value, may be null
+     * @param right  the right value, may be null
+     */
+    public MutablePair(final L left, final R right) {
+        this.left = null;
+        this.right = null;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public L getLeft() {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public R getRight() {
+        return null;
+    }
+
+    /**
+     * Sets the left element of the pair.
+     *
+     * @param left  the new value of the left element, may be null
+     */
+    public void setLeft(final L left) {
+
+    }
+
+    /**
+     * Sets the right element of the pair.
+     *
+     * @param right  the new value of the right element, may be null
+     */
+    public void setRight(final R right) {
+
+    }
+
+    /**
+     * Sets the {@code Map.Entry} value.
+     * This sets the right element of the pair.
+     *
+     * @param value  the right value to set, not null
+     * @return the old value for the right element
+     */
+    @Override
+    public R setValue(final R value) {
+        return null;
+    }
+
+}
\ No newline at end of file
diff --git a/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/MutableTriple.java b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/MutableTriple.java
new file mode 100644
index 00000000000..dc489c44293
--- /dev/null
+++ b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/MutableTriple.java
@@ -0,0 +1,152 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+/**
+ * <p>A mutable triple consisting of three {@code Object} elements.</p>
+ *
+ * <p>Not #ThreadSafe#</p>
+ *
+ * @param <L> the left element type
+ * @param <M> the middle element type
+ * @param <R> the right element type
+ *
+ * @since 3.2
+ */
+public class MutableTriple<L, M, R> extends Triple<L, M, R> {
+
+    /**
+     * The empty array singleton.
+     * <p>
+     * Consider using {@link #emptyArray()} to avoid generics warnings.
+     * </p>
+     *
+     * @since 3.10.
+     */
+    public static final MutableTriple<?, ?, ?>[] EMPTY_ARRAY = null;
+
+    /**
+     * Returns the empty array singleton that can be assigned without compiler warning.
+     *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
+     * @return the empty array singleton that can be assigned without compiler warning.
+     *
+     * @since 3.10.
+     */
+    @SuppressWarnings("unchecked")
+    public static <L, M, R> MutableTriple<L, M, R>[] emptyArray() {
+        return null;
+    }
+
+    /**
+     * <p>Obtains a mutable triple of three objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the triple to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param middle  the middle element, may be null
+     * @param right  the right element, may be null
+     * @return a triple formed from the three parameters, not null
+     */
+    public static <L, M, R> MutableTriple<L, M, R> of(final L left, final M middle, final R right) {
+        return null;
+    }
+    /** Left object */
+    public L left;
+    /** Middle object */
+    public M middle;
+
+    /** Right object */
+    public R right;
+
+    /**
+     * Create a new triple instance of three nulls.
+     */
+    public MutableTriple() {
+    }
+
+    /**
+     * Create a new triple instance.
+     *
+     * @param left  the left value, may be null
+     * @param middle  the middle value, may be null
+     * @param right  the right value, may be null
+     */
+    public MutableTriple(final L left, final M middle, final R right) {
+        this.left = null;
+        this.middle = null;
+        this.right = null;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public L getLeft() {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public M getMiddle() {
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public R getRight() {
+        return null;
+    }
+
+    /**
+     * Sets the left element of the triple.
+     *
+     * @param left  the new value of the left element, may be null
+     */
+    public void setLeft(final L left) {
+
+    }
+
+    /**
+     * Sets the middle element of the triple.
+     *
+     * @param middle  the new value of the middle element, may be null
+     */
+    public void setMiddle(final M middle) {
+
+    }
+
+    /**
+     * Sets the right element of the triple.
+     *
+     * @param right  the new value of the right element, may be null
+     */
+    public void setRight(final R right) {
+
+    }
+}
\ No newline at end of file
diff --git a/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/Pair.java b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/Pair.java
new file mode 100644
index 00000000000..1f23f886e5b
--- /dev/null
+++ b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/Pair.java
@@ -0,0 +1,204 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+import java.io.Serializable;
+import java.util.Map;
+
+/**
+ * <p>A pair consisting of two elements.</p>
+ *
+ * <p>This class is an abstract implementation defining the basic API.
+ * It refers to the elements as 'left' and 'right'. It also implements the
+ * {@code Map.Entry} interface where the key is 'left' and the value is 'right'.</p>
+ *
+ * <p>Subclass implementations may be mutable or immutable.
+ * However, there is no restriction on the type of the stored objects that may be stored.
+ * If mutable objects are stored in the pair, then the pair itself effectively becomes mutable.</p>
+ *
+ * @param <L> the left element type
+ * @param <R> the right element type
+ *
+ * @since 3.0
+ */
+public abstract class Pair<L, R> implements Map.Entry<L, R>, Comparable<Pair<L, R>>, Serializable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 4954918890077093841L;
+
+    /**
+     * An empty array.
+     * <p>
+     * Consider using {@link #emptyArray()} to avoid generics warnings.
+     * </p>
+     *
+     * @since 3.10.
+     */
+    public static final Pair<?, ?>[] EMPTY_ARRAY = null;
+
+    /**
+     * Returns the empty array singleton that can be assigned without compiler warning.
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @return the empty array singleton that can be assigned without compiler warning.
+     *
+     * @since 3.10.
+     */
+    @SuppressWarnings("unchecked")
+    public static <L, R> Pair<L, R>[] emptyArray() {
+        return null;
+    }
+
+    /**
+     * <p>Creates an immutable pair of two objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param right  the right element, may be null
+     * @return a pair formed from the two parameters, not null
+     */
+    public static <L, R> Pair<L, R> of(final L left, final R right) {
+        return null;
+    }
+
+    /**
+     * <p>Creates an immutable pair from an existing pair.</p>
+     *
+     * <p>This factory allows the pair to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <R> the right element type
+     * @param pair the existing pair.
+     * @return a pair formed from the two parameters, not null
+     * @since 3.10
+     */
+    public static <L, R> Pair<L, R> of(final Map.Entry<L, R> pair) {
+        return null;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * <p>Compares the pair based on the left element followed by the right element.
+     * The types must be {@code Comparable}.</p>
+     *
+     * @param other  the other pair, not null
+     * @return negative if this is less, zero if equal, positive if greater
+     */
+    @Override
+    public int compareTo(final Pair<L, R> other) {
+      return 0;
+    }
+
+    /**
+     * <p>Compares this pair to another based on the two elements.</p>
+     *
+     * @param obj  the object to compare to, null returns false
+     * @return true if the elements of the pair are equal
+     */
+    @Override
+    public boolean equals(final Object obj) {
+        return false;
+    }
+
+    /**
+     * <p>Gets the key from this pair.</p>
+     *
+     * <p>This method implements the {@code Map.Entry} interface returning the
+     * left element as the key.</p>
+     *
+     * @return the left element as the key, may be null
+     */
+    @Override
+    public final L getKey() {
+        return null;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * <p>Gets the left element from this pair.</p>
+     *
+     * <p>When treated as a key-value pair, this is the key.</p>
+     *
+     * @return the left element, may be null
+     */
+    public abstract L getLeft();
+
+    /**
+     * <p>Gets the right element from this pair.</p>
+     *
+     * <p>When treated as a key-value pair, this is the value.</p>
+     *
+     * @return the right element, may be null
+     */
+    public abstract R getRight();
+
+    /**
+     * <p>Gets the value from this pair.</p>
+     *
+     * <p>This method implements the {@code Map.Entry} interface returning the
+     * right element as the value.</p>
+     *
+     * @return the right element as the value, may be null
+     */
+    @Override
+    public R getValue() {
+        return null;
+    }
+
+    /**
+     * <p>Returns a suitable hash code.
+     * The hash code follows the definition in {@code Map.Entry}.</p>
+     *
+     * @return the hash code
+     */
+    @Override
+    public int hashCode() {
+        return 0;
+    }
+
+    /**
+     * <p>Returns a String representation of this pair using the format {@code ($left,$right)}.</p>
+     *
+     * @return a string describing this object, not null
+     */
+    @Override
+    public String toString() {
+        return "";
+    }
+
+    /**
+     * <p>Formats the receiver using the given format.</p>
+     *
+     * <p>This uses {@link java.util.Formattable} to perform the formatting. Two variables may
+     * be used to embed the left and right elements. Use {@code %1$s} for the left
+     * element (key) and {@code %2$s} for the right element (value).
+     * The default format used by {@code toString()} is {@code (%1$s,%2$s)}.</p>
+     *
+     * @param format  the format string, optionally containing {@code %1$s} and {@code %2$s}, not null
+     * @return the formatted string, not null
+     */
+    public String toString(final String format) {
+        return "";
+    }
+
+}
\ No newline at end of file
diff --git a/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/Triple.java b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/Triple.java
new file mode 100644
index 00000000000..d8453f7e3cd
--- /dev/null
+++ b/java/ql/test/stubs/apache-commons-lang3-3.7/org/apache/commons/lang3/tuple/Triple.java
@@ -0,0 +1,164 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.tuple;
+
+import java.io.Serializable;
+
+/**
+ * <p>A triple consisting of three elements.</p>
+ *
+ * <p>This class is an abstract implementation defining the basic API.
+ * It refers to the elements as 'left', 'middle' and 'right'.</p>
+ *
+ * <p>Subclass implementations may be mutable or immutable.
+ * However, there is no restriction on the type of the stored objects that may be stored.
+ * If mutable objects are stored in the triple, then the triple itself effectively becomes mutable.</p>
+ *
+ * @param <L> the left element type
+ * @param <M> the middle element type
+ * @param <R> the right element type
+ *
+ * @since 3.2
+ */
+public abstract class Triple<L, M, R> implements Comparable<Triple<L, M, R>>, Serializable {
+
+    /**
+     * An empty array.
+     * <p>
+     * Consider using {@link #emptyArray()} to avoid generics warnings.
+     * </p>
+     *
+     * @since 3.10.
+     */
+    public static final Triple<?, ?, ?>[] EMPTY_ARRAY = null;
+
+    /**
+     * Returns the empty array singleton that can be assigned without compiler warning.
+     *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
+     * @return the empty array singleton that can be assigned without compiler warning.
+     *
+     * @since 3.10.
+     */
+    @SuppressWarnings("unchecked")
+    public static <L, M, R> Triple<L, M, R>[] emptyArray() {
+        return null;
+    }
+
+    /**
+     * <p>Obtains an immutable triple of three objects inferring the generic types.</p>
+     *
+     * <p>This factory allows the triple to be created using inference to
+     * obtain the generic types.</p>
+     *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
+     * @param left  the left element, may be null
+     * @param middle the middle element, may be null
+     * @param right  the right element, may be null
+     * @return a triple formed from the three parameters, not null
+     */
+    public static <L, M, R> Triple<L, M, R> of(final L left, final M middle, final R right) {
+        return null;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * <p>Compares the triple based on the left element, followed by the middle element,
+     * finally the right element.
+     * The types must be {@code Comparable}.</p>
+     *
+     * @param other  the other triple, not null
+     * @return negative if this is less, zero if equal, positive if greater
+     */
+    @Override
+    public int compareTo(final Triple<L, M, R> other) {
+      return 0;
+    }
+
+    /**
+     * <p>Compares this triple to another based on the three elements.</p>
+     *
+     * @param obj  the object to compare to, null returns false
+     * @return true if the elements of the triple are equal
+     */
+    @Override
+    public boolean equals(final Object obj) {
+        return false;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * <p>Gets the left element from this triple.</p>
+     *
+     * @return the left element, may be null
+     */
+    public abstract L getLeft();
+
+    /**
+     * <p>Gets the middle element from this triple.</p>
+     *
+     * @return the middle element, may be null
+     */
+    public abstract M getMiddle();
+
+    /**
+     * <p>Gets the right element from this triple.</p>
+     *
+     * @return the right element, may be null
+     */
+    public abstract R getRight();
+
+    /**
+     * <p>Returns a suitable hash code.</p>
+     *
+     * @return the hash code
+     */
+    @Override
+    public int hashCode() {
+        return 0;
+    }
+
+    /**
+     * <p>Returns a String representation of this triple using the format {@code ($left,$middle,$right)}.</p>
+     *
+     * @return a string describing this object, not null
+     */
+    @Override
+    public String toString() {
+        return "";
+    }
+
+    /**
+     * <p>Formats the receiver using the given format.</p>
+     *
+     * <p>This uses {@link java.util.Formattable} to perform the formatting. Three variables may
+     * be used to embed the left and right elements. Use {@code %1$s} for the left
+     * element, {@code %2$s} for the middle and {@code %3$s} for the right element.
+     * The default format used by {@code toString()} is {@code (%1$s,%2$s,%3$s)}.</p>
+     *
+     * @param format  the format string, optionally containing {@code %1$s}, {@code %2$s} and {@code %3$s}, not null
+     * @return the formatted string, not null
+     */
+    public String toString(final String format) {
+        return "";
+    }
+
+}