How can I see the Java source code that a JSP is compiled into
The answer depends on whether you are using Tomcat or Jetty as your web container.
Tomcat stores the generated source files in the work/jboss.web/HOSTNAME/WEBAPPNAME directory under your ServerConfiguration directory.
For example, the JSP file somedir/somefile.jsp would generate the Java source file server/default/work/jboss.web/localhost/foo/org/apache/jsp/somedir/somefile_jsp.java.
Jetty stores the generated file in the tmp directory This will normally be the directory specified by the system property java.io.tmpdir. On UNIX-like systems this will normally be /tmp.