[jboss-jira] [JBoss JIRA] Updated: (JBAS-5163) Add JDK 6 version of ServerInfo.listThreadDump() taking advantage of new management classes

Add JDK 6 version of ServerInfo.listThreadDump() taking advantage of new management classes ------------------------------------------------------------------------------------------- Key: JBAS-5163 URL: http://jira.jboss.com/jira/browse/JBAS-5163 Project: JBoss Application Server Issue Type: Feature Request Security Level: Public(Everyone can see) Components: JMX/Web Console Affects Versions: JBossAS-5.0.0.Beta3, JBossAS-4.2.2.GA Reporter: Galder Zamarreno Assigned To: Galder Zamarreno Fix For: JBossAS-5.0.1.CR1 Attachments: jdk5-with-deadlock.pdf, jdk5-without-deadlock.pdf, jdk6-with-deadlocks.pdf, jdk6-without-deadlocks.pdf, jmx-serverinfo.dump, kill-3.dump, thread-deadlock.zip There're 4 ways to generate a thread dump. I have taken the output from the same run with different methods: 1.- kill -3. Can be parsed by tools like https://tda.dev.java.net/ (simply, one of the most useful tools I've found out there!). Example: "JBossLifeThread" prio=1 tid=0x0a690cc0 nid=0x1741 in Object.wait() [0x867f2000..0x867f30b0] at java.lang.Object.wait(Native Method) - waiting on <0x9247e200> (a java.lang.Object) at java.lang.Object.wait(Object.java:474) at org.jboss.system.server.ServerImpl$LifeThread.run(ServerImpl.java:940) - locked <0x9247e200> (a java.lang.Object) 2.- JMX via org.jboss.system.server.ServerInfo.listThreadDump(). Here's some output: Thread: JBossLifeThread : priority:5, demon:false, threadId:58, threadState:WAITING, lockName:java.l ang.Object@10cff6b java.lang.Object.wait(Native Method) java.lang.Object.wait(Object.java:474) org.jboss.system.server.ServerImpl$LifeThread.run(ServerImpl.java:940) Lock name is different to lock monitor achieved via kill -3. Doesn't looks like it prints previously locked monitors. Cannot be parsed by TDA tools because it's in JBoss specific format. 3.- Thread.getAllStackTraces(). Haven't tested the output from this. What would this print? Couldn't find an MBean that uses/parses the output from this, but I suspect it's the same as method 2, specially since http://jira.jboss.com/jira/browse/JBAS-1448 has already been fixed. 4.- JConsole Threads view: Code: Name: JBossLifeThread State: WAITING on java.lang.Object@10cff6b Total blocked: 0 Total waited: 1 Stack trace: java.lang.Object.wait(Native Method) java.lang.Object.wait(Object.java:474) org.jboss.system.server.ServerImpl$LifeThread.run(ServerImpl.java:940) Seems to print same info as JBoss' ServerInfo. Bottom line: we should try generating thread dumps that look like kill -3 output to make them more readable than in their current format and to benefit from existing tools that can parse standard kill -3 format.