Changes for page Troubleshooting Frozen Deployed Instances
Last modified by David Avendasora on 2010/11/30 06:43
From version 13.1
edited by Pascal Robert
on 2010/09/12 23:38
on 2010/09/12 23:38
Change comment:
There is no comment for this version
To version 12.1
edited by Pascal Robert
on 2007/09/03 22:05
on 2007/09/03 22:05
Change comment:
There is no comment for this version
Summary
-
Page properties (2 modified, 0 added, 0 removed)
Details
- Page properties
-
- Title
-
... ... @@ -1,1 +1,1 @@ 1 -Deployment-Debugging Frozen Deployed Instances 1 +Web Applications-Deployment-Debugging Frozen Deployed Instances - Content
-
... ... @@ -56,14 +56,6 @@ 56 56 57 57 Now restart your instances. 58 58 59 -Note that some JVM's on other platforms expect the "jdwp" to be specified as follows; 60 - 61 -{{noformat}} 62 - 63 --agentlib:jdwp=transport=dt_socket,address=8121,server=y,suspend 64 - 65 -{{/noformat}} 66 - 67 67 = When Something Goes Wrong... = 68 68 69 69 The instances are listed in the JavaMonitor. A screenshot is shown below with the instance number circled in red. You need to first identify which instance has frozen. ... ... @@ -94,20 +94,6 @@ 94 94 95 95 = What to Look For = 96 96 97 -##jdb##'s ##watch all## command will give you a stack trace for all threads in your app. But your process needs first to be suspended in order to get a coherent stack trace. Use it like so: 98 - 99 -{{noformat}} 100 - 101 -> suspend 102 -All threads suspended. 103 -> where all 104 -... 105 -> resume 106 -All threads resumed. 107 -> 108 - 109 -{{/noformat}} 110 - 111 111 An example of a stack trace is shown below. You'll notice the java class name and source-code line number at the end of a particular entry in the stack. Here we can see that the thread called "WorkerThread103" has stuck trying to get a session from the session store. In this situation another thread will most likely have the session store locked and is not releasing the lock. 112 112 113 113 {{noformat}} ... ... @@ -142,7 +142,3 @@ 142 142 = Conclusion = 143 143 144 144 Despite the simplicity of this approach, it provides for a means by which you can find out what is going on inside frozen instances rather than playing laborious guessing games. 145 - 146 -= Alternative Approaches = 147 - 148 -[[http://www.gvcsitemaker.com/gvc.webobjects/faq&mode=single&recordID=41413]]