XDF_JAVA_HASHTABLE_CANNOT_BE_NULL_KEY_OR_VALUE_CWOBJ6343=CWOBJ6343E: Can not deserialize Java Hashtable object when either the Hashtable key or value is null.
Explanation
Java Hashtable object does not allow to have a null key or a null value.
User response
Use HashMap instead when a null value is required during the object serialization and deserialization.