Java default compilation directory

I'm using the Java Compiler API to build a couple of classes at runtime. However, I'd like these classes to be compiled into the default compilation directory, to where other class files are generated.

Is there a simple way to this? If I check the classpath I can see that the first URI is in fact the d开发者_运维技巧irectory I want, but is it always the first?

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Actually, I think I found a way, using the following:

http://www.javaworld.com/javaworld/javatips/jw-javatip105.html?page=2

However, if there is a better way, please answer.