shared_transport concurrency problem - starting several at the same time causes "timer cannot be retrieved from protocol stack" ------------------------------------------------------------------------------------------------------------------------------- Key: JGRP-964 URL: https://jira.jboss.org/jira/browse/JGRP-964 Project: JGroups Issue Type: Bug Affects Versions: 2.7 Environment: Win2000, JVM = JRockit 6 Reporter: Edward Kuns Assignee: Bela Ban Attachments: CoordinationBus.xml I have an application that starts four jgroups NotificationBus's that all share the same UDP transport (with singleton_name="...") but are otherwise distinct. Recently, the application started to fail to start with the following stack signature: 2009-04-27 13:56:50,425 -0500 ERROR [JGroupsTest] - Exception running bus org.jgroups.ChannelException: unable to setup the protocol stack: timer cannot be retrieved from protocol stack at org.jgroups.JChannel.init(JChannel.java:1574) at org.jgroups.JChannel.<init>(JChannel.java:257) at org.jgroups.JChannel.<init>(JChannel.java:240) at org.jgroups.blocks.NotificationBus.<init>(NotificationBus.java:69) at JGroupsTest$1.run(JGroupsTest.java:25) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.Exception: timer cannot be retrieved from protocol stack at org.jgroups.protocols.Discovery.init(Discovery.java:98) at org.jgroups.protocols.PING.init(PING.java:84) at org.jgroups.stack.ProtocolStack.initProtocolStack(ProtocolStack.java:641) at org.jgroups.stack.ProtocolStack.setup(ProtocolStack.java:468) at org.jgroups.JChannel.init(JChannel.java:1570) ... 5 more I created a test application that does nothing but start these four busses, and if I start them simultaneously, I can always reproduce the above error. I will attach the test application. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira