Change JDK and configuration of new JDK in Weblogic Server

Install the New JDK

Steps:

Download the JDK:Obtain the desired JDK version (e.g., JRockit) from the official Oracle Technology Network (OTN).

Transfer the Installer:Use FTP or another method to transfer the installer to your server.

Set Permissions and Install:Make the installer executable

chmod 755 jrockit-jdk1.6.0_29-R28.2.2-4.1.0-linux-x64.bin

Run the installer:

./jrockit-jdk1.6.0_29-R28.2.2-4.1.0-linux-x64.bin

Install the JDK to your desired location, 

e.g., /u01/Oracle/jrockit-r28.2.2







2.Update WebLogic Configuration to Use the New JDK

Steps:

Shutdown WebLogic Servers:

Ensure all managed servers in the WebLogic domain are stopped.

Backup Configuration Files:

Navigate to the domain's bin directory

cd /u01/Oracle/Middleware/user_projects/domains/<domain_name>/bin

cp setDomainEnv.sh setDomainEnv.sh.bak

Open the file in a text editor.

Locate and comment out existing JAVA_HOME and JAVA_VENDOR settings:

Navigate to the WebLogic common bin directory:

cd /u01/Oracle/Middleware/wlserver_10.3/common/bin

cp commEnv.sh commEnv.sh.bak

Edit setDomainEnv.sh:

Add the new JDK settings:

JAVA_HOME="/u01/Oracle/jrockit-r28.2.2"

export JAVA_HOME

JAVA_VENDOR="Oracle"

export JAVA_VENDOR

Locate the EXTRA_JAVA_PROPERTIES section and remove the -Djrockit.optfile property if present

Edit commEnv.sh:

Open the file in a text editor.

Find the section checking for JAVA_HOME and JAVA_VENDOR

if [ -z "${JAVA_HOME}" -o -z "${JAVA_VENDOR}" ]; then

Add the new JDK settings after this section:

JAVA_HOME="/u01/Oracle/jrockit-r28.2.2"

export JAVA_HOME

JAVA_VENDOR="Oracle"

export JAVA_VENDOR

Restart WebLogic Servers:

Start the Admin Server:

Use the appropriate script to start the Admin Server.

Verify the JDK Change:

Run the following command to check if the Admin Server is using the new JDK:

ps -ef | grep Admin

Start Managed Servers:

Once the Admin Server is confirmed to be running with the new JDK, start the managed servers.