[jboss-jira] [JBoss JIRA] Commented: (JGRP-417) ConnectionTable.run / ClassCastException with IBM Java 1.5
[ http://jira.jboss.com/jira/browse/JGRP-417?page=comments#action_12353339 ]
Bela Ban commented on JGRP-417:
-------------------------------
I still don't see this:
synchronized(conns) {
if(conns.containsKey(peer_addr)) { // this should not throw a CCE
}
}
Map.containsKey(IpAddress) will *not* compare peer_addr against a Connection object ! As
you can see, the only conns.put() in the class places an IpAddress into the conns hashmap
as key, so this guarantees there are only IpAddress instances in conns as keys.
So how did you arrive at the CCE ? Can you reproduce this ?
ConnectionTable.run / ClassCastException with IBM Java 1.5
----------------------------------------------------------
Key: JGRP-417
URL: http://jira.jboss.com/jira/browse/JGRP-417
Project: JGroups
Issue Type: Bug
Affects Versions: 2.2.9 SP4
Environment: $ java -version
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build pxi32devifx-20061107 (iFix
111765: SR3 + 111700) )
IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Linux x86-32 j9vmxi3223-20061001 (JIT
enabled)
J9VM - 20060915_08260_lHdSMR
JIT - 20060908_1811_r8
GC - 20060906_AA)
JCL - 20061107
Reporter: Yves Martin
Assigned To: Bela Ban
Fix For: 2.5
When migrating a project to IBM Java 1.5,
I get the following warning from ConnectionTable:
ConnectionTable.run(): exception is java.lang.ClassCastException: IpAddress.compareTo():
comparison between different classes
And communication times out.
The same code works perfectly well with Sun Java 1.5.0_07
The drop stack trace show it comes from Hashtable.contains.
After comparison between Sun src.zip and IBM src.jar for Hashtable,
. Sun does entry.equals(value)
. IBM does value.equals(entry)
As a result, JGroups happens to do a IpAddress.equals(Connection) with IBM JVM
and fails. Whereas Connection.equals(IpAddress) is properly handled in case of Sun JVM.
Patch is trivial but the bug analysis was difficult !!
Here is a valid IpAddress.equals method.
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof IpAddress)) return false;
return compareTo(obj) == 0 ? true : false;
}
Thank you in advance to include this patch in JGroups 2.2.9 so that JBoss 4.0.x may work
one day with IBM Java 1.5
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://jira.jboss.com/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira