Support Article

we are getting the error message on tomcat logs

SA-4282

Summary



Exceptions loged in tomcat log file.

Error Messages



org.apache.catalina.session.StandardManager startInternal
SEVERE: Exception loading sessions from persistent storage
java.lang.ClassNotFoundException: com.pega.pegarules.session.internal.authorization.ContextMapDiagCallback
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at org.apache.catalina.util.CustomObjectInputStream.resolveClass(CustomObjectInputStream.java:76)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)


Root Cause



This error message is written to log because ContextMapDiagCallback is not visible to the application server.
R&D is aware of this behaviour using Tomcat and our recommendation is to disable HTTP session passivation as this feature is already implemented and performed by PRPC application.


Resolution



The root cause of this problem is misconfiguration in the PRPC operating environment. 

This issue is resolved through the following local change: 

To disable HTTP session passivation, please uncomment Manager pathname in <tomcat>/conf/context.xml as follows and restart Tomcat.

Before change
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<!--
<Manager pathname="" />
-->

After change
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<Manager pathname="" />

Published January 31, 2016 - Updated October 8, 2020


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