To use file watchers, the database Java virtual machine (JVM) component must be installed.

Check whether java is installed :

COMP_NAME STATUS

Oracle Expression Filter VALID Oracle Enterprise Manager VALID Oracle Workspace Manager VALID Oracle Database Catalog Views VALID Oracle Database Packages and Types VALID JServer JAVA Virtual Machine VALID Oracle XDK VALID Oracle Database Java Packages VALID

8 rows selected.

SQL> l 1* select comp_name, status from dba_registry

To use file watchers, the database Java virtual machine (JVM) component must be installed.

Check whether java is installed :

COMP_NAME                                          STATUS
-------------------------------------------------- -----------
Oracle Expression Filter                           VALID
Oracle Enterprise Manager                          VALID
Oracle Workspace Manager                           VALID
Oracle Database Catalog Views                      VALID
Oracle Database Packages and Types                 VALID
JServer JAVA Virtual Machine                       VALID
Oracle XDK                                         VALID
Oracle Database Java Packages                      VALID

8 rows selected.

SQL> l
  1* select comp_name, status from dba_registry