java: add test with deeper paths

also format test files

java/ql/test/query-tests/ThreadSafe/examples/DeepPaths.java

@@ -0,0 +1,61 @@
+package examples;
+
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+@ThreadSafe
+public class DeepPaths {
+    private int y; // $ Alert
+
+    private final Lock lock1 = new ReentrantLock();
+    private final Lock lock2 = new ReentrantLock();
+    private final Lock lock3 = new ReentrantLock();
+
+    public void layer1Locked() {
+        lock1.lock();
+        this.layer2Locked();
+        lock1.unlock();
+    }
+
+    private void layer2Locked() {
+        lock2.lock();
+        this.layer3Unlocked();
+        lock2.unlock();
+    }
+
+    private void layer3Locked() {
+        lock3.lock();
+        y++;
+        lock3.unlock();
+    }
+
+    public void layer1Skip() {
+        lock2.lock();
+        this.layer3Locked();
+        lock2.unlock();
+    }
+
+    public void layer1Indirect() {
+        this.layer2();
+    }
+
+    private void layer2() {
+        this.layer2Locked();
+    }
+
+    public void layer1Unlocked() {
+        this.layer2Unlocked();
+    }
+
+    private void layer2Unlocked() {
+        this.layer3();
+    }
+
+    private void layer3() {
+        this.layer3Locked();
+    }
+
+    private void layer3Unlocked() {
+        y++;
+    }
+}