OPTION 1: Switch JDK for all the servers in all domains under this Middleware home

Locate the following section in $MW_HOME/wlserver_10.3/common/bin/commEnv.sh and update the the JAVA_VENDOR and JAVA_HOME values in there to use the new JDK:

e.g. to switch to JRockit:

 
JAVA_VENDOR="Oracle"
JAVA_HOME="path to the JRockit JDK home"

OPTION 2: Switch JDK for a given domain

3) Backup the $MW_HOME/user_projects/domains/<domain name>/bin/setDomainEnv.sh file

4) Edit $MW_HOME/user_projects/domains/<domain name>/bin/setDomainEnv.sh ,change the JAVA_HOME and add the JAVA_VENDOR in the following section:

# We need to reset the value of JAVA_HOME to get it shortened AND

# we can not shorten it above because immediate variable expansion will blank it

 JAVA_HOME="${JAVA_HOME}"

export JAVA_HOME

replace it by:

# We need to reset the value of JAVA_HOME to get it shortened AND

# we can not shorten it above because immediate variable expansion will blank it

JAVA_HOME="<path to the new JDK"

JAVA_VENDOR=<new Java vendor>

export JAVA_HOME

For example:

JAVA_HOME=”C:/bea/jrockit-jdk1.6.0_26-R28.1.4-4.0.1″

5) Start the servers again and they should all use new JDK . If you find any issue, just revert to the backup of setDomainEnv.sh and restart the environment again to keep running with the original JDK.