OutOfMemoryError

hi all
  i use openjms-0.7.7-alpha-1 and http connnector with tomcat
  yestoday,i got the exception as follow

Exception in thread "http-server://ip:3030/[acceptor]" 
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:574)
        at org.exolab.jms.net.multiplexer.MultiplexedManagedConnection.setInvocationHandler(MultiplexedManagedConnection.java:205)
        at org.exolab.jms.net.connector.DefaultConnectionPool.add(DefaultConnectionPool.java:415)
        at org.exolab.jms.net.connector.DefaultConnectionPool.accepted(DefaultConnectionPool.java:282)
        at org.exolab.jms.net.socket.SocketManagedConnectionAcceptor$Dispatcher.run(SocketManagedConnectionAcceptor.java:323)
Exception in thread "RMI RenewClean-[ip:1117]" java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:574)
        at sun.rmi.transport.tcp.TCPChannel.free(TCPChannel.java:322)
        at sun.rmi.server.UnicastRef.free(UnicastRef.java:395)
        at sun.rmi.server.UnicastRef.done(UnicastRef.java:412)
        at sun.rmi.transport.DGCImpl_Stub.dirty(Unknown Source)
        at sun.rmi.transport.DGCClient$EndpointEntry.makeDirtyCall(DGCClient.java:328)
        at sun.rmi.transport.DGCClient$EndpointEntry.access$1600(DGCClient.java:144)
        at sun.rmi.transport.DGCClient$EndpointEntry$RenewCleanThread.run(DGCClient.java:539)
        at java.lang.Thread.run(Thread.java:595)


	why?
	thank you !

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