From d717be14502554ceb31dadac9aab53973c619b08 Mon Sep 17 00:00:00 2001
From: Jesse McConnell <jesse.mcconnell@gmail.com>
Date: Fri, 16 Mar 2012 14:52:49 -0500
Subject: [PATCH] [Bug 374367] NPE in QueuedThreadPool.dump() with early java6
 jvms

---
 .../eclipse/jetty/util/thread/QueuedThreadPool.java  | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/thread/QueuedThreadPool.java b/jetty-util/src/main/java/org/eclipse/jetty/util/thread/QueuedThreadPool.java
index e3cccc09dd8..a6ae12096f1 100644
--- a/jetty-util/src/main/java/org/eclipse/jetty/util/thread/QueuedThreadPool.java
+++ b/jetty-util/src/main/java/org/eclipse/jetty/util/thread/QueuedThreadPool.java
@@ -465,12 +465,16 @@ public class QueuedThreadPool extends AbstractLifeCycle implements SizedThreadPo
         {
             final StackTraceElement[] trace=thread.getStackTrace();
             boolean inIdleJobPoll=false;
-            for (StackTraceElement t : trace)
+            // trace can be null on early java 6 jvms
+            if (trace != null)
             {
-                if ("idleJobPoll".equals(t.getMethodName()))
+                for (StackTraceElement t : trace)
                 {
-                    inIdleJobPoll=true;
-                    break;
+                    if ("idleJobPoll".equals(t.getMethodName()))
+                    {
+                        inIdleJobPoll = true;
+                        break;
+                    }
                 }
             }
             final boolean idle=inIdleJobPoll;