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From Rob Davies <rajdav...@gmail.com>
Subject Re: Null Pointer Exception on broker
Date Wed, 16 Apr 2008 07:06:46 GMT
We are currently going through votes on 5.1 - should be a few days

cheers,

Rob
On 16 Apr 2008, at 07:44, Ramit Arora wrote:

>
> Hey Rob,
> Thanks for the reply. BTW, when do you expect to roll out 5.1? We  
> really
> need it due to this bug & NFS based master/slave which is broken in  
> 5.0.
>
> Thanks,
> Ramit
>
> rajdavies wrote:
>>
>> Hi Ramit,
>>
>> only just saw you stack trace - this is a known problem - caused by a
>> bug in the InactivityMonitor - its fixed in the upcoming 5.1 release
>> (you could test the release candidate - here:
>> http://people.apache.org/~chirino/staging-repos/activemq-5.1.0-RC3/org/apache/activemq/apache-activemq/5.1.0/)
>>
>> cheers,
>>
>> Rob
>>
>>
>> On 16 Apr 2008, at 07:03, Ramit Arora wrote:
>>>
>>> Hey Fred,
>>> The problem seems to be a bit strange. It occurs only if I use
>>> Solaris to
>>> host my broker. The problem is much more frequent if the server
>>> machine is
>>> Solaris/x86 rather than Solaris/Sparc. Windows machines are not
>>> suffering
>>> from this problem. And the problem disappears if i use JNDI to set  
>>> my
>>> connection factories & destinations. Pretty weird!
>>>
>>> Thanks,
>>> Ramit
>>>
>>> Fred D wrote:
>>>>
>>>> Maybe try to see where the thresold is ... increase 1 or 2  
>>>> subsribers
>>>> until it happens.
>>>>
>>>> A workaround might be to try a network of 2 brokers perhaps to see
>>>> if its
>>>> a scaling issue.
>>>>
>>>> Fred
>>>>
>>>>
>>>> Ramit Arora wrote:
>>>>>
>>>>> Hi,
>>>>> I am testing ActiveMQ 5.0 using a Perl Publisher (using
>>>>> Net::Stomp) &
>>>>> Java Subscribers (Openwire). It works well when the number of
>>>>> subscribers
>>>>> is low (1 or 2) but when I increase the number of subscribers to
>>>>> around
>>>>> 10, I face the following problem:
>>>>>
>>>>> A subscriber shows the following stack trace
>>>>> Exception in thread "ActiveMQ Transport:
>>>>> tcp://xx.yy.zz.com/nnn.nn.nnn.nn:61616"
>>>>> java.lang.ClassCastException:
>>>>> org.apache.activemq.command.BrokerId can not be cast to
>>>>> org.apache.activemq.command.ConsumerId
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3.MessageMarshaller.tightUnmarshal(MessageMarshaller.java:71)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .ActiveMQMessageMarshaller
>>>>> .tightUnmarshal(ActiveMQMessageMarshaller.java:67)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .ActiveMQTextMessageMarshaller
>>>>> .tightUnmarshal(ActiveMQTextMessageMarshaller.java:67)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .OpenWireFormat.tightUnmarshalNestedObject(OpenWireFormat.java: 
>>>>> 452)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .BaseDataStreamMarshaller
>>>>> .tightUnmarsalNestedObject(BaseDataStreamMarshaller.java:127)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .MessageDispatchMarshaller
>>>>> .tightUnmarshal(MessageDispatchMarshaller.java:72)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.openwire.OpenWireFormat.doUnmarshal(OpenWireFormat.java:
>>>>> 361)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java: 
>>>>> 275)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq 
>>>>> .transport.tcp.TcpTransport.readCommand(TcpTransport.java:
>>>>> 192)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:184)
>>>>>       at
>>>>> org
>>>>> .apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:
>>>>> 172)
>>>>>       at java.lang.Thread.run(Thread.java:619)
>>>>>
>>>>> The broker shows the following stack trace:
>>>>> Exception in thread "ActiveMQ Connection Dispatcher: / 
>>>>> nnn.nn.nn.nn:
>>>>> 39997"
>>>>> java.lang.NullPointerException
>>>>>       at java.lang.System.arraycopy(Native Method)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .transport
>>>>> .tcp.TcpBufferedOutputStream.write(TcpBufferedOutputStream.java: 
>>>>> 89)
>>>>>       at java.io.DataOutputStream.write(DataOutputStream.java:90)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .BaseDataStreamMarshaller
>>>>> .tightMarshalByteSequence2(BaseDataStreamMarshaller.java:433)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3.MessageMarshaller.tightMarshal2(MessageMarshaller.java:173)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .ActiveMQMessageMarshaller
>>>>> .tightMarshal2(ActiveMQMessageMarshaller.java:90)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .ActiveMQTextMessageMarshaller
>>>>> .tightMarshal2(ActiveMQTextMessageMarshaller.java:90)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .OpenWireFormat.tightMarshalNestedObject2(OpenWireFormat.java:423)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .BaseDataStreamMarshaller
>>>>> .tightMarshalNestedObject2(BaseDataStreamMarshaller.java:137)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .openwire
>>>>> .v3
>>>>> .MessageDispatchMarshaller
>>>>> .tightMarshal2(MessageDispatchMarshaller.java:106)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.openwire.OpenWireFormat.marshal(OpenWireFormat.java:238)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.transport.tcp.TcpTransport.oneway(TcpTransport.java:153)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .transport.InactivityMonitor.oneway(InactivityMonitor.java:157)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.transport.TransportFilter.oneway(TransportFilter.java: 
>>>>> 82)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .transport.WireFormatNegotiator.oneway(WireFormatNegotiator.java: 
>>>>> 91)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .broker.TransportConnection.dispatch(TransportConnection.java: 
>>>>> 1151)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .broker
>>>>> .TransportConnection.processDispatch(TransportConnection.java:766)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .broker.TransportConnection.iterate(TransportConnection.java:801)
>>>>>       at
>>>>> org
>>>>> .apache
>>>>> .activemq
>>>>> .thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:98)
>>>>>       at
>>>>> org.apache.activemq.thread.DedicatedTaskRunner
>>>>> $1.run(DedicatedTaskRunner.java:36)
>>>>>
>>>>> The broker & the subscriber keep running after this, but the
>>>>> broker does
>>>>> not deliver messages to that subscriber. Other subscribers work
>>>>> fine.
>>>>> This problem is repeatedly occuring. I am using SunOS 5.10 on a
>>>>> machine
>>>>> with 8 processors & 32 GB of RAM.
>>>>> Please help!
>>>>>
>>>>> TIA,
>>>>> Ramit
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>> -- 
>>> View this message in context:
>>> http://www.nabble.com/Null-Pointer-Exception-on-broker-tp16048936s2354p16717003.html
>>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>>
>>
>>
>>
>
> -- 
> View this message in context: http://www.nabble.com/Null-Pointer-Exception-on-broker-tp16048936s2354p16717433.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>


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