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WebSphere® Application Server supports plugging in a custom JAAS login module before or after the WebSphere® Application Server system login module. However, WebSphere® Application Server does not support the replacement of the WebSphere® Application Server system login modules, which are used to create the WSCredential credential and WSPrincipal principal in the Subject. By using a custom login module, you can either make additional authentication decisions or add information to the Subject to make additional, potentially finer-grained, authorization decisions inside a Java Platform, Enterprise Edition (Java EE) application.
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