JMX Agent does not collect new metrics after an application server restart - " An Error occurred (4262639)

***** NOTE THIS SOLUTION NEEDS TO GO THROUGH thE HOTFIX/PATCH PROCESS ****

After an application server (e.g. Tomcat) restart the JMX agent no longer collects any metrics. The only error in the agent log is similar to:

ERROR [Quartz-4543] com.quest.glue.core.agent.scheduler.CollectorCallback - An unexpected error occurred which may cause undesired behavior. You may want to contact Quest Software customer support if you see this error again: An Error occurred while invoking collection method jvmVolatileCollection on ScheduleTask Group JMXAgent/5.7.4/JMXAgent/JMXAgent_on_XXXXX-Collector
java.lang.reflect.InvocationTargetException

..

Caused by: java.lang.NullPointerException