How do i set the classpath in weblogic server

hi,
i am using weblogic SP2. in my application, i have some jars in the lib directory. currently my application is running fine. but when i add some new jars, it is throwing some exception. i guess that it may be because that in the classpath, these new jars might be before the other jars. how can i view the classpath and change it.
thanks,
prashant.

java.net.URL urldir= new java.net.URL("file://C:/Downloads/");
java.net.URL[] urlarr= new java.net.URL[1];
urlarr[0]=urldir;
java.net.URLClassLoader urlcl= new java.net.URLClassLoader(urlarr); +// Here I get the Error+
url=urlcl.getResource("/lrp/utils/New.gif");
*Error: java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader+

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