How to find out where my code is running

Our software can run in EJB or Web Container. Based on its environment it does things differently, For example connection pooling, Transaction Management, etc. Problem is that I cannot figure out a way to make my software smart enough to find out where it is running. Its caller has to pass it a parameter telling it where it is running. I don't like it at all. Can someone please help me to understand what I can do give this functionality to my software i.e to figure out by itself if it is running in WEB container or EJB Container.

Is there maybe a tell-taling class in one onvironment, which is not there in the other one?
try {
Class.forName("tell.taling.one";
//okay
catch (Exception e) {
//oops - not found
}

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