2 files changed, 13 insertions, 8 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/util/Animator.java b/src/jogl/classes/com/jogamp/opengl/util/Animator.java
index 31abe099d..311b4141f 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/Animator.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/Animator.java
@@ -253,9 +253,9 @@ public class Animator extends AnimatorBase {
         }
     }
 
-    public synchronized void start() {
+    public synchronized boolean start() {
         if ( isStartedImpl() ) {
-            throw new GLException("Start: Already running (started "+isStartedImpl()+" (false))");
+            return false;
         }
         if (runnable == null) {
             runnable = new MainLoop();
@@ -271,7 +271,9 @@ public class Animator extends AnimatorBase {
         thread.setDaemon(true); // don't stop JVM from shutdown ..
         thread.start();
         finishLifecycleAction(waitForStartedCondition);
+        return true;
     }
+
     private class WaitForStartedCondition implements Condition {
         public boolean result() {
             return !isStartedImpl() || (!drawablesEmpty && !isAnimating) ;
@@ -279,13 +281,14 @@ public class Animator extends AnimatorBase {
     }
     Condition waitForStartedCondition = new WaitForStartedCondition();
 
-    public synchronized void stop() {
+    public synchronized boolean stop() {
         if ( !isStartedImpl() ) {
-            throw new GLException("Stop: Not running (started "+isStartedImpl()+" (true))");
+            return false;
         }
         stopIssued = true;
         notifyAll();
         finishLifecycleAction(waitForStoppedCondition);
+        return true;
     }
     private class WaitForStoppedCondition implements Condition {
         public boolean result() {
diff --git a/src/jogl/classes/com/jogamp/opengl/util/FPSAnimator.java b/src/jogl/classes/com/jogamp/opengl/util/FPSAnimator.java
index 6bac1646b..741d4461b 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/FPSAnimator.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/FPSAnimator.java
@@ -137,9 +137,9 @@ public class FPSAnimator extends AnimatorBase {
         }
     }
 
-    public synchronized void start() {
+    public synchronized boolean  start() {
         if (timer != null) {
-            throw new GLException("Already started");
+            return false;
         }
         stateSync.lock();
         try {
@@ -148,14 +148,15 @@ public class FPSAnimator extends AnimatorBase {
         } finally {
             stateSync.unlock();
         }
+        return true;
     }
 
     /** Stops this FPSAnimator. Due to the implementation of the
     FPSAnimator it is not guaranteed that the FPSAnimator will be
     completely stopped by the time this method returns. */
-    public synchronized void stop() {
+    public synchronized boolean stop() {
         if (timer == null) {
-            throw new GLException("Already stopped");
+            return false;
         }
         stateSync.lock();
         try {
@@ -168,6 +169,7 @@ public class FPSAnimator extends AnimatorBase {
         } finally {
             stateSync.unlock();
         }
+        return true;
     }
 
     public synchronized boolean pause() {