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From activemqnewbie <acqua...@yahoo.co.in>
Subject Re: NPE while consuming messages
Date Fri, 18 Jan 2008 21:07:58 GMT

Manish,
We are also experiencing similar kind of issues.
Consumer consumes around 1000msgs and then throws null pointer exception.
How did you resolve ur problem.
We are currently using activemq 5 and java 5.
Appreciate ur response.
Thanks,
Vij

manishbel wrote:
> 
> I have a consumer that's consuming messages at about 6msgs/sec and after i
> sent about 15000 messages i got the following exception
> 
> java.lang.NullPointerException
>         at java.util.LinkedList.addBefore(LinkedList.java:635)
>         at java.util.LinkedList.addFirst(LinkedList.java:153)
>         at
> org.apache.activemq.ActiveMQMessageConsumer.beforeMessageIsConsumed(ActiveMQMessageConsumer.java:649)
>         at
> org.apache.activemq.ActiveMQMessageConsumer.receive(ActiveMQMessageConsumer.java:487)
> 
> When i looked at the code it's trying to add the message to the top of a
> linked list. this list also seems to be modified when the message is
> acknowledge so it looks like more of a concurrency issue. 
> 
> Has anybody encountered this issue? If so please let me know if there's a
> way to resolve this or if there was a fix for it? currently we're thinking
> of trying to restart the receivers when the it gets an exception.
> 
> Manish.
> 

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