code: public static void initJavaControls( HttpServletRequest request,
                                           HttpServletResponse response,
                                           ServletContext servletContext,
                                           PageFlowManagedObject controlClient )
          throws ControlFieldInitializationException
      {
          Class controlClientClass = controlClient.getClass();
  
          //
          // First, just return if there are no annotated Control fields.  This saves us from having to catch a
          // (wrapped) ClassNotFoundException for the control client initializer if we were to simply call
          // Controls.initializeClient().
          //
          Map controlFields = getAccessibleControlFieldAnnotations( controlClientClass, servletContext );
          if ( controlFields.isEmpty() ) {
              if(LOG.isTraceEnabled())
                  LOG.trace("No control field annotations were found for " + controlClient);
              PageFlowControlContainer pfcc = PageFlowControlContainerFactory.getControlContainer(request,servletContext);
              pfcc.beginContextOnPageFlow(controlClient,request,response,servletContext);
              return;
          }
  
          request = PageFlowUtils.unwrapMultipart( request );
  
          PageFlowControlContainer pfcc = PageFlowControlContainerFactory.getControlContainer(request,servletContext);
          pfcc.createAndBeginControlBeanContext(controlClient,request,response,servletContext);
          ControlBeanContext beanContext = pfcc.getControlContainerContext(controlClient);
          assert beanContext != null : "ControlBeanContext was not initialized by PageFlowRequestProcessor";
  
          try
          {
              if(LOG.isDebugEnabled())
                  LOG.debug("Initializing control client " + controlClient);
              Controls.initializeClient(null, controlClient, beanContext);
          }
          catch ( Exception e )
          {
              LOG.error( "Exception occurred while initializing controls", e);
              throw new ControlFieldInitializationException( controlClientClass.getName(), controlClient, e );
          }
      }
docs: Initialize all null member variables that are Java Controls.
  
  @param request the current HttpServletRequest
  @param response the current HttpServletRequest
  @param servletContext the ServletContext
  @param controlClient the class with possible annotated Control fields
  @throws org.apache.beehive.netui.pageflow.ControlFieldInitializationException