Websphere Application Logs filled with NullPointerExceptions.

Document ID : KB000029832
Last Modified Date : 14/02/2018
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Description

The Websphere Application logs are filled with the following Null Pointer Exception errors (NPE):

SystemErr R java.lang.NullPointerException 

SystemErr R at com.wily.introscope.agent.trace.InvocationData.setMyThread(InvocationData.java:###)
SystemErr R at com.wily.introscope.agent.trace.hc2.BlamePointTracer.ITracer_startTrace(BlamePoint Tracer.java:###) 
SystemErr R at com.wily.introscope.agent.trace.InvocationData.IMethodTracer_startTrace(Invocation Data.java:####) 

 

The IntroscopeAgent.log contain the following error message:

[ERROR] [IntroscopeAgent.Agent] Exception starting method tracer actual trace for ......

 

Solution:

- Check the IntroscopeAgent.profile for the Directive Files in use by checking the below property:

introscope.autoprobe.directivesFile=:

 

- If you are using a NON-Legacy PBL, do the following:

1. Set introscope.agent.configuration.old=false

2. Save the file. 

3. Restart the application for the change to get effect.