A javacore, or thread
dump is needed in order to determine the
potentially hung threads.
there are two ways
1) Via Admin console
Set the
com.ibm.websphere.threadmonitor.dump.java property to true:
Application Servers:
From the administrative console, click Servers >
Application Servers > server_name.
Under Server Infrastructure, click Administration >
Custom Properties.
Click New and add the following property:
Name: com.ibm.websphere.threadmonitor.dump.java
Value: true
Click Apply.
Click OK and save the configuration changes.
Restart the Application Server for the changes to take
effect.
Node Agent:
From the administrative console, click System Administration
> Node Agents > nodeagent.
Under Additional Properties, click Administration Services
Under Additional Properties, click Custom Properties
Click New and add the following property:
Name: com.ibm.websphere.threadmonitor.dump.java
Value: true
Click Apply.
Click OK and save the configuration changes.
Restart the Node Agent for the changes to take effect.
After the restart , when ever your application encounters a
hung thread i.e ( WSVR0605W message is written out to the SystemOut.log file)
it will generate the dumps.
Note: - i usually would not recommend doing it since taking
thread dumps may alter the performance of the application or consume high CPU.
2) Another way is a force full way - we can take the thread dumps with command line.
Go to websphere directory
example: - D:\Program
Files\IBM\WebSphere\ProcServer\profiles\wprcs_profile\bin
and open up wasadmin.bat file
enter the username and password of WAS
then run these commands to grab the thrad dumps
1) wsadmin>set jvm [$AdminControl completeObjectName
type=JVM,process=server1,*]
example: -
wsadmin>set jvm [$AdminControl completeObjectName
type=JVM,process=App.BSpaceCluster.BSpaceMember,*]
App.BSpaceCluster.BSpaceMember : - this is my Server1 ( you
can find it from the console)
2) wsadmin>$AdminControl invoke $jvm dumpThreads
Run both the commands atleast three/four time in duration of
15 seconds.
Look for an output
file, in the installation root directory for the product, with a name like
'javacore.date.time.id.txt'.
0 Comments