使用plsql编译pkg报错，错误信息如下：
解决方法：sqlplus / as sysdbaexecdbms_java_dev.enable;
参考官方文档：database upgrade fails with errors “ora-02290: check constraint (sys.java_dev_disabled) violated” & “ora-04045: sys.dbms_isched” (文档 id 1985725.1)
start the target db in upgrade mode.connect to the database as a sysdba user & execute:sql> exec dbms_java_dev.enable;
官方文档提供解决方法：