code: protected Class defineClassFromData(File container, byte[] classData, String classname)
              throws IOException {
          definePackage(container, classname);
          ProtectionDomain currentPd = Project.class.getProtectionDomain();
          String classResource = getClassFilename(classname);
          CodeSource src = new CodeSource(FILE_UTILS.getFileURL(container),
                                          getCertificates(container,
                                                          classResource));
          ProtectionDomain classesPd =
              new ProtectionDomain(src, currentPd.getPermissions(),
                                   this,
                                   currentPd.getPrincipals());
          return defineClass(classname, classData, 0, classData.length,
                             classesPd);
      }
docs: Define a class given its bytes
  
  @param container the container from which the class data has been read
  may be a directory or a jar/zip file.
  
  @param classData the bytecode data for the class
  @param classname the name of the class
  
  @return the Class instance created from the given data
  
  @throws IOException if the class data cannot be read.