Ratpack Promise add support for apply method

java/ql/src/semmle/code/java/frameworks/ratpack/RatpackExec.qll

@@ -54,7 +54,7 @@ abstract private class SimpleFluentLambdaMethod extends FluentLambdaMethod {
 private class RatpackPromiseMapMethod extends SimpleFluentLambdaMethod {
   RatpackPromiseMapMethod() {
     getDeclaringType() instanceof RatpackPromise and
-    hasName(["map", "flatMap", "blockingMap"])
+    hasName(["map", "flatMap", "blockingMap", "apply"])
   }
 
   override predicate consumesTaint(int lambdaArg) { lambdaArg = 0 }

java/ql/test/library-tests/frameworks/ratpack/resources/Resource.java

@@ -189,4 +189,24 @@ class Resource {
                 sink(value); //$hasTaintFlow
             });
     }
+
+    void test9() {
+        String tainted = taint();
+        Promise
+            .value(tainted)
+            .apply(Resource::identity)
+            .then(value -> {
+                sink(value); //$hasTaintFlow
+            });
+        Promise
+            .value("potato")
+            .apply(Resource::identity)
+            .then(value -> {
+                sink(value); // no taints flow
+            });
+    }
+
+    public static Promise<String> identity(Promise<String> input) {
+        return input.map(i -> i);
+    }
 }

java/ql/test/stubs/ratpack-1.9.x/ratpack/exec/Promise.java

@@ -113,4 +113,8 @@ public interface Promise<T> {
   default Promise<T> fork() {
     return null;
   }
+
+  default <O> Promise<O> apply(Function<? super Promise<T>, ? extends Promise<O>> function) {
+    return null;
+  }
 }