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How to implement additional jar support if ONLY it exists

I am developing a jar library to use the utility.

I want to significantly reduce dependencies on external banners / libraries, but provide built-in support for such a library, if it exists in the class path.

For example, I want the library to provide routines that work with sleep mode; however, I do not want the application to die in error if sleeping banks are not present.

Is there any way to implement this without having to link sleeping jars to my library?

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