Before you can work with Stored Java objects in Oracle
Forms, you must install the necessary Java classes and PL/SQL package on the
Oracle database.
To install the Java Object support in Oracle Forms: 
1.   
Locate the installation scripts in your
<oracle_home>/dbs directory. You will need the following files to install
Java Object support: 
·       
dejavins.sql 
·       
dejavaux.sql 
·       
derefls.plb 
·       
dereflb.plb 
·       
dedbjava.jar
 
2.   
Run sqlplus from the same directory where the
scripts are located. 
3.   
Logon as SYSTEM. 
If the installation is correct, then you will see the
ORA_DE_REFLECTION package (derefls.plb and dereflb.plb) under the schema SYS