Finding the minimum needed Java version to run app

Hello, I have created an application and would like to distribute it. However, I would like to know the minimum Java version that would be needed to run the app. Aside from digging through the APIs, would there be any tool that would help with that task.
(P.S. I'm sorry for any cross-posting that may occur, I did not know what this would fall under).

Doesn't answer the question, which java version did you use?
In eclipse, pull down the help menu and select About Eclipse SDK, then click the Configuration button. In the dialog that comes up near the top is a section with java.??? look for the one that say java.home and see which version of the jdk it's using, then go to your project, right click on it and to go properties. Under Java Compiler in the tree view you will see JDK compliance. That will tell you absolutely which version(s) of Java are involved. The one in the compiler compliance is the one that the system trying to run your application must have.
PS.

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