Create Java application reference to library "com.sap.security.api.sda"

Hi

I have a third party java application which is running on SAP portal through native call.

I am getting error while loading java classes, and have been requested to create a reference to my java application to resolve this.

Error: Library is already loaded in another ClassLoader

Can any one please guide me on how to create an application reference to the library "com.sap.security.api.sda"

Also where can I find the "web-j2ee-engine.xml" and the "application-j2ee-engine.xml" descriptor files?

Please guide or any code example will be helpful.

Thanks