title: Java flag to enable extended Serialization debugging info
body: <p>I am currently struggling with HTTP Session replication on tomcat with complex objects.</p>
  
  <p>Some objects implement <code>Serializable</code> but hold non-serializable members.</p>
  
  <p>Unfortunately, the stacktraces do not provide much useful info here by default.</p>
  
  <p><strong>there is a flag -XX:???? to enable verbose class names</strong> 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</p>
  
  <p>What is the name of the flag?</p>