We seem to be having some problems like this in more than one section of code. I really don't understand it at all; we suspect some kind of JVM bug. Unfortunately, no-one has been able to deliver a testcase that will help me reproduce this on my machine.
I can't really do much, until I can reproduce it.
P.S. You might also get this if you share a session between two threads - but at least some occurrences of this problem do not seem to be caused by this....
William R. Lorenz wrote:
Fellow Hibernaters,
I'm receiving an Exception in a Hibernate application I've built, and I'm a bit confused as to why this might be happening. The code at where the Exception is thrown is quite simple, and I think this might be a bug in Hibernate itself. I've searched Google for this to no avail, and I'm using the latest recommended Hibernate release as available on the site.
The exception I receive has a stacktrace as follows:
java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(Unknown Source) at java.util.AbstractList$Itr.remove(Unknown Source) at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2101) at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2061) at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2005) at net.sf.hibernate.transaction.JDBCTransaction.commit( JDBCTransaction.java:57 ) at org.express.ftpsrv.ConnectionHandler.<init>(ConnectionHandler.java:72) at org.express.ftpsrv.ConnectionListener.accept(ConnectionListener.java:56) at org.express.ftpsrv.ConnectionListener.main(ConnectionListener.java:19)
And the code at ConnectionHandler.java:72 that causes this looks like:
52:this.ftpSession = new FtpSession(); 53: 54:/* ftpSession.setSessionId() does not operate on the unique 55: * 'id' field that is also part of the ftpSession object. 56: */ 57:ftpSession.setSessionId(UniqueGenerator.makeUniqueNumber()); 58: 59:Date currentDate = new Date(); 60:currentDate.setTime(System.currentTimeMillis()); 61:this.ftpSession.setBegTime(currentDate); 62: 63:net.sf.hibernate.Session hSession = null; 64:Transaction transaction = null; 65: 66:try 67:{ 68: hSession = SessionHolder.getSession(); 69: 70: transaction = hSession.beginTransaction(); 71: hSession.save(this.session); 72: transaction.commit(); 73:} catch (HibernateException e) 74:{ 75: transaction.rollback(); 76:}
I'd like to point out that this seems to be an intermittent thing, occurring more often when I instantiate many objects quickly (the quoted lines 52-72, above, are within a cronstructor in the Object).
Does anyone have any ideas as to what might be happening or where I might look for additional information in order to track down this bug?
Thanks, in advance, for any response on this.
-- _ __ __ ___ _| | William R. Lorenz <[EMAIL PROTECTED]> \ V V / '_| | http://www.clevelandlug.net/ ; "Every revolution was \./\./|_| |_| first a thought in one man's mind." - Ralph Waldo Emerson
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