How can I access Local (Java Code) under services? How can I view the actual java code?
From Composer? no way.
I am assuming this is for Thingworx extensions that use Java code (such as resources). If so, the easiest way is a Java decompiler to decompile the jar files. I use this one: Java Decompiler
The java .jar files can be found either in the extension zip or in the Tomcat webapps folder.
Check out the upcoming Expert Session: Understanding ThingWorx Navigate Licensing in Community "Customer Events" section.