Hi ALL One of my coworker using loadjava to load a jar file to database.but unfortunately he copied a wrong file names and loaded a higher version basic jar file(rt.jar) to database, after this,about 10,000+ java class objects become INVALID and below error throw in alert.log ORA-00600: internal error code, arguments: [26599], [1], [18], [], [], [], [], [] and I cannot load right version rt.jar to database,and also cannot drop any JAVA CLASS objects. SQL> select owner, 2 'drop java class "' || dbms_java.longname(object_name) || '";' 3 from DBA_objects 4 where object_type like 'JAVA CLASS' 5 and dbms_java.longname(object_name) like ('sun/applet/AppletAudioClip') ; from DBA_objects * ERROR at line 3: ORA-04045: errors during recompilation/revalidation of SYSTEM.sun/io/Converters ORA-00600: internal error code, arguments: [26599], [1], [225], [], [], [], [], [] how can i recover it,any suggestion will be appreciated. Best Regards Samuel