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From David Jencks <david_jen...@yahoo.com>
Subject Re: ConcurrentModificationException while starting AG1.1
Date Tue, 09 May 2006 07:43:19 GMT

On May 8, 2006, at 11:25 PM, Manu George wrote:

> Hi David,
>       I just compared the file on your page with the file in one of  
> my builds of G. It seems to be missing two files mbeans- 
> descriptors.dtd and ant.properties. Was these files removed on  
> purpose?

I just ran maven -o jar:install -Dmaven.test.skip=true

I have no idea how the 1.1 release was built.  I can't see how  
ant.properties could be useful :-)  and apparently mbeans- 
descriptors.dtd isn't actually needed??

>
> Regards
> Manu
>
> On 5/9/06, Manu George <manu.t.george@gmail.com> wrote:
> Thanks David. Can I take this jar
> (http://people.apache.org/~djencks/maven/commons-modeler/jars/ 
> commons-modeler-1.2-GERONIMO-SNAPSHOT.jar ) and replace the one in  
> a previous version of G say 1.0? Will it be fine? Or do I have to  
> do a rebuild?

I think it will work in G 1.0 if you rename it to have version 1.1.   
It should work in any recent build of 1.1 just by adding it to the  
geronimo repository without renaming.  Since it is used only by  
tomcat which I have not rebuilt I think its safe to say there are no  
interface changes since commons-modeler 1.1 :-)

thanks
david jencks



>
> Regards
> Manu
>
>
> On 5/9/06, David Jencks < david_jencks@yahoo.com> wrote:
> I've put a private build of commons-modeler on my apache page and  
> modified the g. build to use it.  Could you rebuild g (you will  
> need a clean build after dain's changes) and see if this CME is fixed?
>
> thanks
> david jencks
>
> On May 8, 2006, at 2:30 PM, David Jencks wrote:
>
>> I've opened
>> http://issues.apache.org/bugzilla/show_bug.cgi?id=39521
>>
>> for this and I wrote a patch to possibly fix it.  I'm going to  
>> push a private jar for this and set up the g. build to use it.
>>
>> I also opened  http://issues.apache.org/jira/browse/GERONIMO-1999  
>> for us to track this problem
>>
>> thanks
>> david jencks
>>
>>
>>
>> On May 8, 2006, at 3:33 AM, Phani Madgula wrote:
>>
>>> 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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