Dequeue method hangs

All,
on our sun solaris OS 5.6 we run oracle database server 8.1.6 and AQ server 8.1.6. We use jdbc thin (classes12.zip) oracle8i 8.1.6.2.0 JDBC Driver for jdk 1.2.x .
We use the AQ api from our java backend to dequeue messages from the AQ server. It happens time to time that this method hangs. The error is hard to reproduce and does happen after the backend has been running for a while, usually a few hours.
Any hints for the reason of this are greatly appreciated.
Thanks Ben: [email protected]
Below is the stack thrace of the thread that hangs:
Thread-2:
[1] java.net.SocketInputStream.socketRead (native method)
[2] java.net.SocketInputStream.read (SocketInputStream:90)
[3] oracle.net.ns.Packet.receive (pc 32)
[4] oracle.net.ns.NetInputStream.getNextPacket (pc 48)
[5] oracle.net.ns.NetInputStream.read (pc 21)
[6] oracle.net.ns.NetInputStream.read (pc 5)
[7] oracle.net.ns.NetInputStream.read (pc 6)
[8] oracle.jdbc.ttc7.MAREngine.unmarshalUB1 (MAREngine:718)
[9] oracle.jdbc.ttc7.MAREngine.unmarshalSB1 (MAREngine:690)
[10] oracle.jdbc.ttc7.Oall7.receive (Oall7:372)
[11] oracle.jdbc.ttc7.TTC7Protocol.doOall7 (TTC7Protocol:1330)
[12] oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch (TTC7Protocol:757)
[13] oracle.jdbc.driver.OracleStatement.executeNonQuery (OracleStatement:1313)
[14] oracle.jdbc.driver.OracleStatement.doExecuteOther (OracleStatement:1232)
[15] oracle.jdbc.driver.OracleStatement.doExecuteWithBatch (OracleStatement:1353)
[16] oracle.jdbc.driver.OracleStatement.doExecute (OracleStatement:1760)
[17] oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout (OracleStatement:1807)
[18] oracle.jdbc.driver.OraclePreparedStatement.executeUpdate (OraclePreparedStatement:332)
[19] oracle.jdbc.driver.OraclePreparedStatement.executeQuery (OraclePreparedStatement:283)
[20] oracle.AQ.AQOracleQueue.dequeue (AQOracleQueue:1356)
[21] oracle.AQ.AQOracleQueue.dequeue (AQOracleQueue:1132)

Folks,
I have read this post with great interest related to the AQ dequeue problems reported. We got the same problem and I am wondering that whether you have found the solution to the problem.
Your help is highly appreciated.
Thanks,
Yibing

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Dequeue method hangs

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