[ https://issues.apache.org/activemq/browse/AMQ-749?page=all ]
Hiram Chirino resolved AMQ-749:
-------------------------------
Resolution: Fixed
Assign To: Hiram Chirino
Added synchronization to make thread safe.
> ConnectionDotFileInterceptor not thread safe.
> ---------------------------------------------
>
> Key: AMQ-749
> URL: https://issues.apache.org/activemq/browse/AMQ-749
> Project: ActiveMQ
> Type: Bug
> Versions: 4.0
> Environment: Windows
> Reporter: Ning Li
> Assignee: Hiram Chirino
> Priority: Critical
> Fix For: 4.1, 4.0.1
>
>
> Unable to run multithreaded MQ application, even for the simplest case.
> This is the peudo code, modified the ProducerTool.java
> For ( thread 1 to 30 )
> {
> Connection connection = createConnection();
> Session session = createSession(connection);
> Producer producer = createProducer(session);
> sendMessages(producer, 20); //send 20 messages to broker using all
> default settings
> }
> these are the exceptions from broker:
> Caught: javax.jms.JMSException: java.util.ConcurrentModificationException
> [cp://localhost/127.0.0.1:61616] ActiveMQConnection WARN Async
> exception with no exception listener:
> java.util.ConcurrentModificationException
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
> at java.util.HashMap$EntryIterator.next(HashMap.java:829)
> at java.util.HashMap$EntryIterator.next(HashMap.java:827)
> at
> org.apache.activemq.broker.view.ConnectionDotFileInterceptor.printProducers(ConnectionDotFileInterceptor.java:157)
> at
> org.apache.activemq.broker.view.ConnectionDotFileInterceptor.generateFile(ConnectionDotFileInterceptor.java:140)
> at
> org.apache.activemq.broker.view.DotFileInterceptorSupport.generateFile(DotFileInterceptorSupport.java:47)
> at
> org.apache.activemq.broker.view.ConnectionDotFileInterceptor.addProducer(ConnectionDotFileInterceptor.java:85)
> at
> org.apache.activemq.broker.MutableBrokerFilter.addProducer(MutableBrokerFilter.java:90)
> at
> org.apache.activemq.broker.AbstractConnection.processAddProducer(AbstractConnection.java:397)
> at org.apache.activemq.command.ProducerInfo.visit(ProducerInfo.java:100)
> at
> org.apache.activemq.broker.AbstractConnection.service(AbstractConnection.java:201)
> at
> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:62)
> at
> org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:97)
> at
> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:63)
> at
> org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:114)
> at
> org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:122)
> at
> org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:87)
> at
> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:143)
> at java.lang.Thread.run(Thread.java:595)
> and exception in the client side:
> javax.jms.JMSException: java.util.ConcurrentModificationException
> at
> org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSupport.java:45)
> at
> org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1137)
> at org.apache.activemq.AdvisoryConsumer.<init>(AdvisoryConsumer.java:45)
> at
> org.apache.activemq.ActiveMQConnection.ensureConnectionInfoSent(ActiveMQConnection.java:1227)
> at
> org.apache.activemq.ActiveMQConnection.start(ActiveMQConnection.java:435)
> at
> com.businessobjects.framework.services.mq.ToolSupport.createConnection(ToolSupport.java:51)
> at
> com.businessobjects.framework.services.mq.ProducerTool.run(ProducerTool.java:106)
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