Jerry Cwiklik created UIMA-5768:
-----------------------------------
Summary: UIMA-AS: fix race condition leading to NPE while
recovering from lost connection to broker
Key: UIMA-5768
URL: https://issues.apache.org/jira/browse/UIMA-5768
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.10.4AS
When UIMA-AS client looses broker connection it goes into a retry mode trying
to reconnect. In one particular case the NPE was thrown :
7| | javax.jms.JMSException: java.io.EOFException
7| | at
org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSupport.java:54)
7| | at
org.apache.activemq.ActiveMQConnection.onAsyncException(ActiveMQConnection.java:1948)
7| | at
org.apache.activemq.ActiveMQConnection.onException(ActiveMQConnection.java:1967)
7| | at
org.apache.activemq.transport.TransportFilter.onException(TransportFilter.java:114)
7| | at
org.apache.activemq.transport.ResponseCorrelator.onException(ResponseCorrelator.java:126)
7| | at
org.apache.activemq.transport.TransportFilter.onException(TransportFilter.java:114)
7| | at
org.apache.activemq.transport.TransportFilter.onException(TransportFilter.java:114)
7| | at
org.apache.activemq.transport.WireFormatNegotiator.onException(WireFormatNegotiator.java:173)
7| | at
org.apache.activemq.transport.AbstractInactivityMonitor.onException(AbstractInactivityMonitor.java:345)
7| | at
org.apache.activemq.transport.TransportSupport.onException(TransportSupport.java:96)
7| | at
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:219)
7| | at java.lang.Thread.run(Thread.java:811)
7| | Caused by: java.io.EOFException
7| | at java.io.DataInputStream.readFully(DataInputStream.java:208)
7| | at java.io.DataInputStream.readInt(DataInputStream.java:398)
7| | at
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:268)
7| | at
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:240)
7| | at
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:232)
7| | at
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:215)
7| | ... 1 more
7| | java.lang.NullPointerException
7| | at
org.apache.uima.adapter.jms.client.ActiveMQMessageSender.createSession(ActiveMQMessageSender.java:109)
7| | at
org.apache.uima.adapter.jms.client.ActiveMQMessageSender.initializeProducer(ActiveMQMessageSender.java:144)
7| | at
org.apache.uima.adapter.jms.client.ActiveMQMessageSender.getMessageProducer(ActiveMQMessageSender.java:164)
7| | at
org.apache.uima.adapter.jms.client.BaseMessageSender.run(BaseMessageSender.java:286)
7| | at java.lang.Thread.run(Thread.java:811)
Looks like the above is caused by some race condition. One thread trying to
reconnect while another trying to use a connection handle which had been
invalidated.
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