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I recently worked on a PMR where an unusual #stack seemed to be causing a lot of WebContainer #threads to lock which impacted performance, so I thought of sharing this scenario in case you have been noticing the same during performance tuning, and weren't able to figure out the cause. If you are running WebSphere Application Server V7, this is the stack you need to look for:   at java.util.Collections$SynchronizedMap.get(Collections.java:751)   at com.ibm.ws.webcontainer.webapp.WebApp.getAttribute(WebApp.java:2800)   at read more...

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