JavaVM
From Oracle FAQ
JServer or JavaVM is a database resident JVM (Java Virtual Machine) that allows Java programs to run within the Oracle database server.
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Install
JavaVM can be installed with the DBCA utility or manually:
cd $ORACLE_HOME/javavm sqlplus "SYS/ AS SYSDBA" @initjvm.sql
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Remove
JavaVM can be deinstalled with the DBCA utility or manually:
cd $ORACLE_HOME/javavm sqlplus "SYS/ AS SYSDBA" @rmjvm.sql

