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From "J. Matthew Pryor" <>
Subject Re: Massive accumulation of ConcurrentHashMap in heap
Date Sun, 03 Jan 2010 23:02:53 GMT
Thanks for the reply Rob,

I am not sure how we are accumulating these connections, could be  
anything to do with having turned JMX on?

We sometime have clients with intermittent TCP/IP network connection?  
Perhaps we have timeout issues or some other reason for retaining the  

Can you suggest any mods or config changes we can perform to help  

We still have the dumped heap file, are there any other queries we can  
perform that might shed more light?

Thanks again


On 03/01/2010, at 9:13 PM, Rob Davies wrote:

> On 3 Jan 2010, at 02:07, J. Matthew Pryor wrote:
>> Hi,
>> I am trying to track down the reason for a massive accumulation of  
>> ConcurrentHashMap in the heap of our long running Java process.
>> We are running Java 1.6 so I am pretty sure the known issue  
>> relating to the 1.5 JVM doesn't apply here.
>> The URL below is a link to a screen shot of the heap analysis,  
>> showing the accumulated memory. It seems to be root in a series or  
>> region brokers?
>> I can also see that some JMX classes are in the root, could the  
>> reason for the accumulation be related to having JMX enabled?
>> As far as we can tell, the queues are being serviced normally, and  
>> this application generally runs for long periods of time without  
>> any noticeable memory leak.
>> I'd be greatly appreciative of any ideas for strategies to get more  
>> information about the source of the memory accumulation.
>> We're using Java 1.6 7 Active MQ 5.3
>> Thanks,
>> Matthew
> Yuk - I thought I had purged all the use of ConcurrentHashMap - it  
> looks like you have a lot of active connections ??
> Rob Davies
> I work here:
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