Stuck threads / slow response.

We have a problem with our application running on weblogic 9.2. Some applications are working fine, others remain blocked. Studied for some time, but no clear indication of what the problem is yet.

Last thread dumps have a large number of occurences of the following type
"[ACTIVE] ExecuteThread: '48' for queue: 'weblogic.kernel.Default (self-tuning)'" waiting for lock weblogic.servlet.jsp.JavelinxJSPStub@c469fb BLOCKED
     weblogic.servlet.jsp.JspStub.checkForReload(JspStub.java:119)
     weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:232)
     weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)
        . . . 

"[ACTIVE] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)'" waiting for lock javelin.client.JobWaiter@ef27d1 WAITING
     java.lang.Object.wait(Native Method)
     java.lang.Object.wait(Object.java:474)
     javelin.client.JobWaiter.blockUntilFinished(JobWaiter.java:45)
      javelin.client.ClientUtilsImpl.build(ClientUtilsImpl.java:859)
     weblogic.servlet.jsp.JavelinxJSPStub.compilePage(JavelinxJSPStub.java:250)
        . . . 
Suggests that we have a problem with jsp compilations?

Or is it likely just a symptom of a different problem?

Hello

It seems that WebLogic trying to check for the resource JSP reload... and he's STUCK in this process...

By chance you tried to disable the 'resource-charging-check-dry' in weblogic.xml by assigning the value "-1".
(http://download.oracle.com/docs/cd/E12840_01/wls/docs103/webapp/weblogic_xml.html)
And "* page-check-seconds *" in weblogic.xml "-1".»

resources-charging-check-dry
The element is used to perform caching for cached resources that are found in the path of resource in the scope of the metadata Web. This parameter identifies the frequency of WebLogic Server checks to see if a resource has been changed and if so, it recharges.
A value of-1 means never charge. This is the default value in a production environment.
The value 0 means always reload.
A value of 1 means that reload every second. This is the default value in a development environment.
The values specified for this parameter using the administration Console prevail.

page-check-seconds Sets the interval, in seconds, that WebLogic Server checks if the JSP files have changed and need to recompile. The dependencies are also checked and recursively reloaded if changed.
A value of-1 means never check the man pages. This is the default value in a production environment.
The value 0 means always check the man pages.
The value 1 means check the pages every second. This is the default value in a development environment.
In a production environment where changes to a JSP page are scarce, consider changing the value of pageCheckSeconds to 60 or more, according to your needs setting.

Deactivation of the "page-check-seconds' can help to understand this issue...

Thank you
Jay SenSharma

Tags: Fusion Middleware

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