code: public Class<?> classForProcedureOrUDF(String procedureClassName)
              throws LinkageError, ExceptionInInitializerError, ClassNotFoundException {
          return classForProcedureOrUDF(procedureClassName, m_catalogInfo.m_jarfile.getLoader());
      }
docs: Given a class name in the catalog jar, loads it from the jar, even if the
  jar is served from an URL and isn't in the classpath.
  
  @param procedureClassName The name of the class to load.
  @return A java Class variable associated with the class.
  @throws ClassNotFoundException if the class is not in the jar file.