Java Home on Solaris 10

Hi All ,
Config tool and JSPM are not opening for PI 7.1 on Solaris 10.
It was working fine before.Seems the issue is with Java home .
But i am not sure how to check Java home in Solaris.
Also PI 7.1 ,JDK is inbuilt and we didn't set Java Home.
But now i want to recheck the Java home environment variable.
Can you pls help me with the relevant commands to do so.
#setenv didn't provided any info or Java home.
Regards
Ajay

Thanks Anjali
Hi Markus
Config tool is hanging.Actually its a P1 7.1 system and we never set the Java home .
Now patched SAP JVM manually.But now entire java (server node etc ) are not coming up..
logs are here :JVM_bootstrap.out
============
   INFO: Loading tool launcher...
   INFO: [OS: SunOS] [VM vendor: SAP AG] [VM version: 5.1.034] [VM type: SAP Java Server VM]
   INFO: Main class to start: "com.sap.engine.bootstrap.Bootstrap"
   INFO: Loading 15 JAR files: [./bootstrap/sap.comtcbliqlibimpl.jar, ./bootstrap/sap.comtcexceptionimpl.jar, ./bootstrap/sap.comtcjeofflineconfigurationimpl.jar, ./bootstrap/sap.comtcbloffline_launcherimpl.jar, ./bootstrap/sap.comtcsecsecstorefsjavacore.jar, ./bootstrap/jdbc.jar, ./bootstrap/sap.comtcblconfigimpl.jar, ./bootstrap/sap.comtcjeflightrecorder.jar, ./bootstrap/sap.comtcsapxmltoolkitsapxmltoolkit.jar, ./bootstrap/sap.comtcloggingjavaimpl.jar, ./bootstrap/sap.comtcbljdsrjdsr.jar, ./bootstrap/sap.comtcjebootstrapimpl.jar, ./bootstrap/jperflib.jar, ./bootstrap/sap.comtcbldeployofflineimpl.jar, ./bootstrap/sap.comtcblopensql~implStandalone.jar]
   INFO: Start
Component: [internal/unkown] of type [unkown]
Message: [Exception occurred:]
com.sap.engine.bootstrap.SynchronizationException: Unknown value [FORCE ] of [element.resynch] property.
     at com.sap.engine.bootstrap.BootstrapProperties.parseResynchMode(BootstrapProperties.java:180)
     at com.sap.engine.bootstrap.BootstrapProperties.parseProperties(BootstrapProperties.java:200)
     at com.sap.engine.bootstrap.Bootstrap.main(Bootstrap.java:175)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sap.engine.offline.OfflineToolStart.main(OfflineToolStart.java:161)
[Bootstrap]> Problem occurred while performing synchronization. For more details see the logs above.
=============
Regards
Ajay

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