From 5e723c42f9b5f2aa70f0b4b72217468d4442e582 Mon Sep 17 00:00:00 2001
From: Jaroslav Bachorik <jbachorik@openjdk.org>
Date: Mon, 22 Jun 2015 12:13:39 +0200
Subject: [PATCH] 8081634: Concurrent usage of a StringBuilder causes test
 intermittent failures

Reviewed-by: sla, sspitsyn
---
 .../management/jmxremote/startstop/ManagementAgentJcmd.java   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/jdk/test/sun/management/jmxremote/startstop/ManagementAgentJcmd.java b/jdk/test/sun/management/jmxremote/startstop/ManagementAgentJcmd.java
index f273cd2ce4b..d2f231cdfc0 100644
--- a/jdk/test/sun/management/jmxremote/startstop/ManagementAgentJcmd.java
+++ b/jdk/test/sun/management/jmxremote/startstop/ManagementAgentJcmd.java
@@ -196,7 +196,9 @@ final class ManagementAgentJcmd {
             l.addToolArg(cmd);
         }
 
-        StringBuilder output = new StringBuilder();
+        // this buffer will get filled in different threads
+        //   -> must be the synchronized StringBuffer
+        StringBuffer output = new StringBuffer();
 
         AtomicBoolean portUnavailable = new AtomicBoolean(false);
         Process p = ProcessTools.startProcess(