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You can create a custom
      security realm that draws from an existing store of users such as
      directory server on the network. To use a custom security realm, you
      first create an implementation of the weblogic.security.acl.AbstractListableRealm
      interface or the weblogic.security.acl.AbstractManageableRealm
      interface and then use the Administration Console to install your
      implementation.
The Create a New Basic Realm page appears.
The Settings page for the Custom security realm appears.
When configuring the Caching realm, select the LDAP Realm V2 option from the pull-down menu for the Basic Realm attribute on the Caching Realms: Configuration: General page. The Basic Realm attribute defines the association between the Caching realm and the alternate security realm (in this case, the LDAP V2 security realm).
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