Default in WebSphere8.5.5.2 using JDK6, if you want to upgrade to JDK7, you can use the following method.
Look at existing WebSphere version JDK
# cd /opt/IBM/WebSphere/AppServer/profiles/AppSrv01
# bin/managesdk.sh -listAvailable
CWSDK1003I: Available SDKs :
CWSDK1005I: SDK name: 1.6_64
CWSDK1005I: SDK name: 1.7.1_64
CWSDK1001I: Successfully performed the requested managesdk task.
Switching JDK
# bin/managesdk.sh -enableProfile -profileName AppSrv01 -sdkName 1.7.1_64 -enableServers
或
# bin/managesdk.sh -enableProfileAll -sdkName 1.7.1_64 -enableServers
After the switch, remember to restart each service.
Start Service
cd /opt/IBM/WebSphere/AppServer/profiles/
AppSrv01/bin/startNode.sh
Dmgr01/bin/startManager.sh
Stop Service
cd /opt/IBM/WebSphere/AppServer/profiles/
Dmgr01/bin/stopManager.sh
AppSrv01/bin/stopNode.sh