Java flag to enable extended Serialization debugging info

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I am currently struggling with HTTP Session replication on tomcat with complex objects.

Some objects implement Serializable but hold non-serializable members.

Unfortunately, the stacktraces do not provide much useful info here by default.

there is a flag -XX:???? to enable verbose class names in the stacktrace when a NotSerializableException occurrs. this flag would help me a lot finding the source of the error. but i forgot its name

What is the name of the flag?

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