Explain the difference between getPortletSession () and PortletSession getPortletSession (boolean create) ?

PortletRequest interface two methods for handling  portlet session. i.e we can get PortletSession from both ActionRequest and RenderRequest


  /**
   * Returns the current portlet session or, if there is no current session,
   * creates one and returns the new session.
   *  <p>
   * Creating a new portlet session will result in creating
   * a new <code>HttpSession</code> on which the portlet session is based on.
   *
   * @return the portlet session
   */

  public PortletSession getPortletSession ();



The second method provides a facility to tell not to create a new session if not exists

 /**
   * Returns the current portlet session or, if there is no current session
   * and the given flag is <CODE>true</CODE>, creates one and returns
   * the new session.
   * <P>
   * If the given flag is <CODE>false</CODE> and there is no current
   * portlet session, this method returns <CODE>null</CODE>.
   *  <p>
   * Creating a new portlet session will result in creating
   * a new <code>HttpSession</code> on which the portlet session is based on.
   *
   * @param create
   *               <CODE>true</CODE> to create a new session, <BR>
   *               <CODE>false</CODE> to return <CODE>null</CODE> if there
   *               is no current session
   * @return the portlet session
   *
   */

  public PortletSession getPortletSession (boolean create);