When the correlator creates an event to pass to the JMon code, it ensures that all fields of a non-primitive type have a non-null value. Note that this is different from the Java default, which is to allow null values for non-primitive types.

The com.apama.jmon.Event default constructor uses reflection to initialize non-primitive null fields with the following values:

In your application, if you explicitly assign a null value to a non-primitive event field, and your application tries to emit, enqueue, or route that event, the correlator logs an error and terminates your application.