Accessing a jar META-INF folder


I am developping a java service which use an external jar.
In this jar, there is a META-INF/xades/ file which is used by the libraries

It seems that the java service in webmethods is not able to acces this encapsulated file.
Do you know a trick to allow this ?

Thanks for your answers.

PackageName/code/libs folder

holds DLLs or specialized libraries that the Java and C/C++ services use.