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 > > > ----- Goto www.ttmsolutions.com for a free ActiveMQ user guide -- View this message in context: http://www.nabble.com/Null-Pointer-Exception-on-broker-tp16048936s2354p16703624.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.
