Use one of the following methods to find Oracle WebLogic Server version

1. From registry.xml in MW_HOME
Go to Middleware Home under which WebLogic is installed and look for file registry.xml
Open registry.xml and search for “component name=”WebLogic Server”” version=”10.3.3.0″  (variable version next to this will tell you weblogic version)

2.From WebLogic Admin Server logfile at $DOMAIN_HOME/servers/AdminServer/admin/AdminServer.log and search for “WebLogic Server“. Output like below will tell you WebLogic Server version (10.3.4.0 as per output below)

________
WebLogic Server 10.3.4.0  Fri Dec 17 20:47:33 PST 2010 1384255  Copyright (c) 1995, 2009, Oracle and/or its affiliates. All rights reserved.>
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3. From class weblogic.version 
Go to directory which contains weblogic.jar ($WL_HOME/server/lib) and run below command

java -cp weblogic.jar weblogic.version

You should see output like
______________
WebLogic Server 10.3.4.0  Fri Dec 17 20:47:33 PST 2010 1384255
Use ‘weblogic.version -verbose’ to get subsystem information

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