Add option to print peer connection factory Java stack traces.

talk/app/webrtc/java/src/org/webrtc/PeerConnectionFactory.java

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 130 matching lines @@
   public void dispose() {
     nativeFreeFactory(nativeFactory);
     signalingThread = null;
     workerThread = null;
   }
 
   public void threadsCallbacks() {
     nativeThreadsCallbacks(nativeFactory);
   }
 
-  public static void printStackTraces() {
-    if (workerThread != null) {
-      Logging.d(TAG, "Worker thread stacks trace:");
-      for (StackTraceElement stackTrace : workerThread.getStackTrace()) {
-        Logging.d(TAG, stackTrace.toString());
+  private static void printStackTrace(Thread thread, String threadName) {
+    if (thread != null) {
+      StackTraceElement[] stackTraces = thread.getStackTrace();
+      if (stackTraces.length > 0) {
+        Logging.d(TAG, threadName + " stacks trace:");
+        for (StackTraceElement stackTrace : stackTraces) {
+          Logging.d(TAG, stackTrace.toString());
+        }
       }
     }
-    if (signalingThread != null) {
-      Logging.d(TAG, "Signaling thread stacks trace:");
-      for (StackTraceElement stackTrace : signalingThread.getStackTrace()) {
-        Logging.d(TAG, stackTrace.toString());
-      }
-    }
+  }
+
+  public static void printStackTraces() {
+    printStackTrace(workerThread, "Worker thread");
+    printStackTrace(signalingThread, "Signaling thread");
   }
 
   private static void onWorkerThreadReady() {
     workerThread = Thread.currentThread();
     Logging.d(TAG, "onWorkerThreadReady");
   }
 
   private static void onSignalingThreadReady() {
     signalingThread = Thread.currentThread();
     Logging.d(TAG, "onSignalingThreadReady");
@@ skipping 26 matching lines @@
 
   public native void nativeSetOptions(long nativeFactory, Options options);
 
   private static native void nativeSetVideoHwAccelerationOptions(
       long nativeFactory, Object renderEGLContext);
 
   private static native void nativeThreadsCallbacks(long nativeFactory);
 
   private static native void nativeFreeFactory(long nativeFactory);
 }