Upgrading Database To 12.2 Makes Java Objects Invalid And Recompilation Fails With ORA-00600 , , 
(Doc ID 2297508.1)
Last updated on MARCH 05, 2019
Applies to:Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
After upgraded the database to 12.2 from some lower database versions like 12.1 or 11.2. Some of the Java Classes become invalid and the recompilation of this Java sources leads to the ORA-00600:, ,  error.
1.The problem has been demonstrated with following examples
Create following Java sources in 11.2 or 12.1 database (i.e < 12.2)
Upgraded the database to 12.2 from 12.1 or 18.104.22.168
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