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diff --git a/src/java/jogamp/common/util/locks/LockDebugUtil.java b/src/java/jogamp/common/util/locks/LockDebugUtil.java
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+++ b/src/java/jogamp/common/util/locks/LockDebugUtil.java
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+/**
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * 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, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package jogamp.common.util.locks;
+
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import com.jogamp.common.util.locks.Lock;
+
+/**
+ * Functionality enabled if {@link Lock#DEBUG} is <code>true</code>.
+ */
+public class LockDebugUtil {
+    private static final ThreadLocal<ArrayList<Throwable>> tlsLockedStacks;
+    private static final List<Throwable> dummy;
+    static {
+        if(Lock.DEBUG) {
+            tlsLockedStacks = new ThreadLocal<ArrayList<Throwable>>();
+            dummy = null;
+        } else {
+            tlsLockedStacks = null;
+            dummy = new ArrayList<Throwable>(0);
+        }
+    }
+    
+    public static List<Throwable> getRecursiveLockTrace() {
+        if(Lock.DEBUG) {
+            ArrayList<Throwable> ls = tlsLockedStacks.get();
+            if(null == ls) {
+                ls = new ArrayList<Throwable>();
+                tlsLockedStacks.set(ls);
+            }
+            return ls;
+        } else {
+            return dummy;
+        }
+    }
+    
+    public static void dumpRecursiveLockTrace(PrintStream out) {
+        if(Lock.DEBUG) {
+            List<Throwable> ls = getRecursiveLockTrace();
+            if(null!=ls && ls.size()>0) {
+                int j=0;
+                out.println("TLSLockedStacks: locks "+ls.size());
+                for(Iterator<Throwable> i=ls.iterator(); i.hasNext(); j++) {
+                    out.print(j+": ");
+                    i.next().printStackTrace(out);
+                }
+            }
+        }
+    }
+}