In the Oracle 11i architecture stack, it is possible that your Oracle 11i runs on either JRE (Java Runtime Environment) or JInitiator.

To determine where is the JAVA installation home, just execute the command as below to detect where the Oracle called the java library from: -

$ ps -ef | grep java

oradev 3221 1 0 Dec 24 ? 59:26 /opt/java1.4/bin/PA_RISC2.0/java -ms128m -mx256m -classpath .:/develop_app/dev/devcomn/java/jdbc111.zip:/develop_app/dev/devcom
oradev 23657 1 0 09:15:16 ? 0:10 /opt/java1.4/jre/bin/PA_RISC2.0/java -DCLIENT_PROCESSID=23657 -hotspot -Xmx256M -Xms128M -XX:MaxPermSize=128M -XX:NewSize=64M -
oradev 16509 1 0 Feb 19 ? 12:42 /opt/java1.4/jre/bin/PA_RISC2.0/java -DCLIENT_PROCESSID=16509 -hotspot -Xmx256M -Xms128M -XX:MaxPermSize=128M -XX:NewSize=64M -
oradev 16510 1 0 Feb 19 ? 14:16 /opt/java1.4/jre/bin/PA_RISC2.0/java -DCLIENT_PROCESSID=16510 -hotspot -Xmx256M -Xms128M -XX:MaxPermSize=128M -XX:NewSize=64M -

The java that the Oracle App is using is installed in: /opt/java1.4

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