title: Java default compilation directory
body: <p>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.</p>
  
  <p>Is there a simple way to this? If I check the classpath I can see that the first URI is in fact the directory I want, but is it always the first?</p>