I’ve got a Webservice deployed on Apache ServiceMix which uses Apache Camel to invoke an ActiveMQ driven route using code similar to the following:
context.createProducerTemplate().sendBody("activemq:startComplex", xml);
The invocation works fine but after some time the file descriptor limit on my Linux machine gets hit. The resources are eaten up by a whole bunch (a few thousand) of ActiveMQ threads. Under the jmx console I can see a lot of threads similar to the following:
Name: ActiveMQ Transport: tcp://localhost/127.0.0.1:61616
State: RUNNABLE
Total blocked: 0 Total waited: 0
Stack trace:
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:129)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:5 0)
org.apache.activemq.transport.tcp.TcpTransport$2.fill(TcpTransport.java:589)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:5 8)
org.apache.activemq.transport.tcp.TcpTransport$2.read(TcpTransport.java:574)
java.io.DataInputStream.readInt(DataInputStream.java:370)
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:275)
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:222)
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:214)
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:197)
java.lang.Thread.run(Thread.java:662)
and
Name: ActiveMQ Transport: tcp:///127.0.0.1:46420
State: RUNNABLE
Total blocked: 0 Total waited: 2
Stack trace:
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:129)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:50)
org.apache.activemq.transport.tcp.TcpTransport$2.fill(TcpTransport.java:589)
org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:58)
org.apache.activemq.transport.tcp.TcpTransport$2.read(TcpTransport.java:574)
java.io.DataInputStream.readInt(DataInputStream.java:370)
org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:275)
org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTransport.java:222)
org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:214)
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:197)
java.lang.Thread.run(Thread.java:662)
And ideas how to get rid of the hanging threads?
I managed to get rid of the leaking threads issue by dropping all use of ProducerTemplate and ConsumerTemplate.
I am now using standard JMS APIs to send and receive messages from ActiveMQ.