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From "Phani Madgula" <phanibalaji.madg...@gmail.com>
Subject ConcurrentModificationException while starting AG1.1
Date Mon, 08 May 2006 10:33:48 GMT
Hi,

I am getting the following exception, quite unfrequently, may be once
in 25 times, while starting AG1.1

jvm 1    | 08:24:25,762 ERROR [Registry] Error registering Geronimo:type=Request
Processor,worker=http-localhost%2F127.0.0.1-8453,name=HttpRequest0
jvm 1    | java.util.ConcurrentModificationException: concurrent access to HashM
ap attempted by Thread[http-localhost%2F127.0.0.1-8453-Processor25,5,main]
jvm 1    |      at java.util.HashMap.onEntry(HashMap.java:205)
jvm 1    |      at java.util.HashMap.transfer(HashMap.java:510)
jvm 1    |      at java.util.HashMap.resize(HashMap.java:500)
jvm 1    |      at java.util.HashMap.addEntry(HashMap.java:800)
jvm 1    |      at java.util.HashMap.put(HashMap.java:441)
jvm 1    |      at org.apache.commons.modeler.Registry.addManagedBean(Registry.j
ava:457)
jvm 1    |      at org.apache.commons.modeler.Registry.loadDescriptors(Registry.
java:938)
jvm 1    |      at org.apache.commons.modeler.Registry.findManagedBean(Registry.
java:719)
jvm 1    |      at org.apache.commons.modeler.Registry.findManagedBean(Registry.
java:1047)
jvm 1    |      at org.apache.commons.modeler.Registry.registerComponent(Registr
y.java:859)
jvm 1    |      at org.apache.coyote.http11.Http11Protocol$JmxHttp11ConnectionHa
ndler.init(Http11Protocol.java:175)
jvm 1    |      at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.getInit
Data(LeaderFollowerWorkerThread.java:48)
jvm 1    |      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
(ThreadPool.java:686)
jvm 1    |      at java.lang.Thread.run(Thread.java:797)
jvm 1    | 08:24:25,762 ERROR [Registry] Error loading jar:file:/D:/ccviews/d_sj
c_tk4s_f5887_pathfinder_wasce_only/v3tools/thirdparty/was_ce/test/was-ce-1.1.0/r
epository/tomcat/tomcat-ajp/5.5.15/tomcat-ajp-5.5.15.jar!/org/apache/jk/mbeans-d
escriptors.xml
jvm 1    | 08:24:25,762 WARN  [Http11BaseProtocol] Error registering request


I saw that the Registry class is not thread-safe. In the method,
Http11Protocol:JmxHttp11ConnectionHandler:init()
there is a call to Registry.getRegistry(null, null).registerComponent(
rp, rpName, null)

Should this be synchronized to resolve the problem?

Can we synchronize it? Any suggestions?

Regards
phani

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