PQ80782: A NullPointerException or ConcurrentModificationException is thrown
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Abstract
A NullPointerException or ConcurrentModificationException is thrown from either the SelectionManager or PMIManager during very heavy workloads.
 
Download Description
Under heavy workloads, a NullPointerException or ConcurrentModificationException is thrown from a WeakHashmap object in the Workload Management code. The exception may look something like this:

Root exception is java.util.ConcurrentModificationException:
concurrent access to HashMap attempted by Thread Thread-7,5,
at java.util.HashMap.onExit(HashMap.java:175)
at java.util.HashMap.rehash(HashMap.java:347)
at java.util.HashMap.put(HashMap.java:418)
at java.util.WeakHashMap.put(WeakHashMap.java:298)
at com.ibm.ws.wlm.client.selection.SelectionManager.pushServerForInvocat
at com.ibm.ws.wlm.client.selection.SelectionManager.getTarget(SelectionM
...
...
 
Prerequisites
Please download the UpdateInstaller below to install this fix.
 
URL LANGUAGE SIZE(Bytes)
UpdateInstaller - 5.0.x US English 7000000
UpdateInstaller - 5.1.x US English 4000000
 
 
Installation Instructions
Please review the readme.txt for detailed installation instructions.
 
URL LANGUAGE SIZE(Bytes)
Readme US English 2489
 
Download package
What is DD?
Download RELEASE DATE LANGUAGE SIZE(Bytes) Download Options
PQ80782 12/19/2003 US English 7722 FTP DD
 
Technical support
1-800-IBM-SERV (U.S. Only)
 
Cross Reference information
Segment Product Component Platform Version Edition
Application Servers Runtimes for Java Technology Java SDK
Problems (APARS) fixed
PQ80782
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > Workload Management (WLM)
Operating system(s): Windows
Software version: 5.1
Software edition:
Reference #: 4006123
IBM Group: Software Group
Modified date: Apr 26, 2006