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From "Xin Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-5385) Create/Close session in a loop causing connection to be closed and connection.close to hang after that
Date Tue, 03 Dec 2013 19:05:35 GMT
Xin Chen created QPID-5385:
------------------------------

             Summary: Create/Close session in a loop causing connection to be closed and connection.close
to hang after that
                 Key: QPID-5385
                 URL: https://issues.apache.org/jira/browse/QPID-5385
             Project: Qpid
          Issue Type: Bug
          Components: Java Client
    Affects Versions: 0.24
            Reporter: Xin Chen


sample test code:
      factory = ConnectionFactoryImpl.createFromURL(connectionUri);
      connection = factory.createConnection();
      connection.start();
      for (int i = 0; i < 10; i++)
      {
        System.out.println("creating session " + i);
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); 
        session.close();
      }
      session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
      Destination destination = session.createQueue("q1");
      MessageProducer producer = session.createProducer(destination);
      session.close();
      connection.close();

Issues observed:
1. ConnectionClosedException is thrown from connection.createSession(...)
2. SenderCreationException is thrown from session.createProcuder(...)
2. the last connection.close() can hang

Root cause:
connection.createSession(...) -> send a begin frame
session.close() -> send an end frame and session is removed from connection's local session
collection

When the peer sends back a begin frame, no session can be found using begin.remote-channel
so the connection is closed. This causes session/producer creation to fail.

If the peer also sends another frame (e.g. flow), it generates a NullPointerException in ConnectionEndpoint.receiveFlow()
because session is null. This exception is unhandled and the thread dies. Connection.close()
hangs with the following stack:
"main" prio=10 tid=0x00007f738400a000 nid=0x1508 in Object.wait() [0x00007f738cd20000]
   java.lang.Thread.State: WAITING (on object monitor)
                at java.lang.Object.wait(Native Method)
                - waiting on <0x00000007d7ba3ac8> (a org.apache.qpid.amqp_1_0.transport.ConnectionEndpoint)
                at java.lang.Object.wait(Object.java:503)
                at org.apache.qpid.amqp_1_0.client.Connection.close(Connection.java:430)
                - locked <0x00000007d7ba3ac8> (a org.apache.qpid.amqp_1_0.transport.ConnectionEndpoint)
                at org.apache.qpid.amqp_1_0.jms.impl.ConnectionImpl.close(ConnectionImpl.java:385)




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