code: public Class defineClass(ClassNode classNode, String file, String newCodeBase) {
          CodeSource codeSource = null;
          try {
              codeSource = new CodeSource(new URL("file", "", newCodeBase), (java.security.cert.Certificate[]) null);
          } catch (MalformedURLException e) {
              //swallow
          }
  
          CompilationUnit unit = createCompilationUnit(config, codeSource);
          ClassCollector collector = createCollector(unit, classNode.getModule().getContext());
          try {
              unit.addClassNode(classNode);
              unit.setClassgenCallback(collector);
              unit.compile(Phases.CLASS_GENERATION);
              definePackage(collector.generatedClass.getName());
              return collector.generatedClass;
          } catch (CompilationFailedException e) {
              throw new RuntimeException(e);
          }
      }
docs: Loads the given class node returning the implementation Class.
  <p>
  WARNING: this compilation is not synchronized
  
  @param classNode
  @return a class