Upgrade the JVM
If the Application strictly uses Oracle 1.6 JDK, we won't be able to help as Java 1.6 is no longer supported.
As per CA APM 10.5.2 Release Notes:https://docops.ca.com/ca-apm/10-5/en/ca-apm-release-notes
Java 1.6 No Longer Supported
We no longer support the Java agent on JVM 1.6 run time. If you have applications on Java 6, you can use the older version of the agent. Our agents are always compatible and fully supported on higher versions of the Enterprise Managers.