I also encountered the same problem, and I got a solution.
1.If you startup weblogic in enclipse,
you can configure the weblogic, in the Paths configurations, you can add the rhino.jar to the "Prepend to classpath" , restart your weblogic and it will be ok.
2.If you startup using startweblogic.cmd, you just need to change the set classpath property.
in windows enviroment:
you need to change the file : bea\user_projects\domains\yourdomain\bin\ startweblogic.cmd,
change this row
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set CLASSPATH=%CLASSPATH%;%MEDREC_WEBLOGIC_CLASSPATH%
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to
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set CLASSPATH=E:\bea9\user_projects\domains\liferay\lib\rhino.jar;%CLASSPATH%;%MEDREC_WEBLOGIC_CLASSPATH%
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this directory : "E:\bea9\user_projects\domains\liferay\lib\rhino.jar " is where you reserve rhino.jar, and this jar is from the liferay package.
In doing this, the rhino.jar in liferay will be preloaded. Hope this will help you.
