/**
* Set a override map containing <code>key -> values</code> that takes
precedent when doing find operations on the ValueStack.
* <p/>
* See the unit test for ValueStackTest for examples.
* @param overrides overrides map.
*/
//best not to use Map <String,Object> when you want to push a browser object
into the map
//use Map<Object,Object> instead as seen here
Map<Object, Object> overrides=new HashMap<Object, Object>();
//push any object you want into the overrides map
overrides.put("browser", userSession.getBrowser());
ActionContext.getContext().getValueStack().setExprOverrides(overrides);
//now when you use ValueStack.findValue(String expr) you will find the object
(including browser) from the overrides map
Martin Gainty
______________________________________________
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> Date: Fri, 4 Feb 2011 18:27:53 +0900
> From: li.wei.linf...@gmail.com
> To: user@struts.apache.org
> CC: rubens.go...@appia.com
> Subject: Re: S2 Action Setter Not Called
>
> the problem is that you pushed a HashMap on the ValueStack's root.
>
> if you do that, all the values will be populated to the HashMap, not
> your action class
>
> you can try this code to fix it.
>
> ActionContext.getContext().put("browser", userSession.getBrowser());
>
>
>
> (2011/02/04 17:12), Rubens Gomes wrote:
> > Okay. I found what is causing the setters not to be called. I have an
> > interceptor called ValueStackInterceptor (which is called prior to
> > ParametersInterceptors) that is placing a String variable "browser" on the
> > stack (please, see code below). If I comment out the line that places this
> > variable on the stack (see below) everything works fine. I am showing the
> > Interceptor and the line of code that is causing a problem.
> >
> > Can someone please help me understand what is the problem with this code?
> >
> >
> > -----------------------------------------
> >
> > package com.softlagos.web.struts2.interceptor;
> >
> > import java.util.HashMap;
> > import java.util.Map;
> >
> > import javax.servlet.http.HttpServletRequest;
> >
> > import org.apache.commons.lang.xwork.StringUtils;
> > import org.apache.commons.logging.Log;
> > import org.apache.commons.logging.LogFactory;
> > import org.apache.struts2.ServletActionContext;
> >
> > import com.opensymphony.xwork2.ActionContext;
> > import com.opensymphony.xwork2.ActionInvocation;
> > import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
> > import com.softlagos.web.common.UserSession;
> > import com.softlagos.web.common.WebAppUtils;
> >
> >
> > /**
> > * Interceptor object used to initialize the Struts 2 Value Stack with
> > some state information (like the
> > * browser variable) that is needed in the results.
> > *
> > * @author Rubens Gomes
> > * @version $Id: ValueStackInterceptor.java 3754 2011-02-03 00:39:46Z
> > rgomes $
> > */
> > public final class ValueStackInterceptor extends AbstractInterceptor
> > {
> > private static final long serialVersionUID = 1;
> > private static final Log logger =
> > LogFactory.getLog(ValueStackInterceptor.class.getName());
> >
> > public ValueStackInterceptor()
> > {
> > super();
> > }
> >
> > @Override
> > public String intercept(final ActionInvocation invocation)
> > throws Exception
> > {
> > HttpServletRequest request = ServletActionContext.getRequest();
> > UserSession userSession = WebAppUtils.getUserSession(request);
> >
> > /*
> > * The DetectUserAgentFilter code should be run prior to Struts 2
> > filter because that filter
> > * is responsible for setting the browser on the HTTP userSession
> > session object.
> > */
> > if(userSession==null)
> > throw new IllegalStateException("The userSession was not
> > set.");
> >
> > if(StringUtils.isBlank(userSession.getBrowser()))
> > {
> > String msg = "The userSession browser is null, which means
> > that the user agent detection failed. Code cannot proceed at this point.";
> > IllegalStateException ex = new IllegalStateException(msg);
> > logger.error(msg, ex);
> > throw ex;
> > }
> > if(logger.isInfoEnabled())
> > logger.info("Setting Struts2 value stack browser [" +
> > userSession.getBrowser() + "].");
> >
> > Map<String, Object> context = new HashMap<String, Object>();
> > // browser is used on Result objects to render either a desktop or
> > mobile JSP page.
> >
> > context.put("browser", userSession.getBrowser());
> >
> > /* ---->>> THE FOLLOWING LINE IS IMPACTING ON ACTION SETTER NOT TO BE
> > CALLED<<< ---- */
> > ActionContext.getContext().getValueStack().push(context);
> >
> >
> > /* --- Reverse Path --- */
> > return invocation.invoke();
> > }
> > }
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
> > For additional commands, e-mail: user-h...@struts.apache.org
> >
>
