communication between portlets over applicationScope

[fuchs]

Excuse me, but I am a new Jboss Portal user.

jboss portal bundle 2.7.2
richfaces 3.3.1.GA
jsf-facelets 1.1.14
portletbridge 1.0.0.CR2

Now, I am trying to use the applicationScope.

Here is the code, which I am using from an example. It should use the applicationScope:

...
private String chatMessage;

public void setText(String text) {
 this.text=text;
 String username = "unknown user";
 //String log = getText() != null ? getText() : "";
 text = /*log +*/ "<b>" + username + ": </b> " + text + "<hr/>";
 if (getRenderRequest() != null){
 TextHolderIF hwif =
 (TextHolderIF)getRenderRequest().getAttribute
 ("javax.portlet.p./Kundenportal/Startseite
 /SmallChartPortletWindow?textHolder");
 hwif.setText(text);
 }
 textHolder.setText(text);
}

public String getChatMessage() {
 return chatMessage;
}

public void setChatMessage(String chatMessage) {
 this.chatMessage = chatMessage;
}

public void sendMessage(ActionEvent actionEvent) {
 setText(chatMessage);
 this.chatMessage = "";
}

private HttpSession getRenderRequest() {
 HttpServletRequestWrapper responseObject =
 (HttpServletRequestWrapper)FacesContext.getCurrentInstance().
 getExternalContext().getRequest();
 if (responseObject instanceof HttpServletRequestWrapper) {
 return responseObject.getSession(false);
 }
 return null;
}

With the @PortletScope(PortletScope.ScopeType.APPLICATION_SCOPE) command, the portlets have the same applicationScope.
But the textHolder object is missing.

I am getting these Error Message from the Console:

14:40:17,295 ERROR [STDERR] 16.09.2009 14:40:17 javax.faces.event.MethodExpressionActionListener pro
cessAction
SCHWERWIEGEND: Received 'java.lang.ClassCastException' when invoking action listener '#{SmallChartBe
an.sendMessage}' for component
 'j_id32'
14:40:17,304 ERROR [STDERR] 16.09.2009 14:40:17 javax.faces.event.MethodExpressionActionListener pro
cessAction
SCHWERWIEGEND: java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade cannot be c
ast to javax.servlet.http.Http
ServletRequestWrapper
 ...
14:40:17,418 ERROR [AjaxViewRoot] Error processing faces event for the component _jbpns_2fKundenport
al_2fStartseite_2fSmallChartPo
rtletWindowsnpbj:_viewRoot:j_id29:j_id32
javax.faces.event.AbortProcessingException: /SmallChart.xhtml @83,112 actionListener="#{SmallChartBean.sendMessage}": java.lang.Cl
assCastException: org.apache.catalina.connector.RequestFacade cannot be cast to javax.servlet.http.H
ttpServletRequestWrapper
 ...
Caused by: java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade cannot be cast
to javax.servlet.http.HttpServ
letRequestWrapper
 ...
14:40:17,583 ERROR [AjaxViewRoot] Error processing faces event for the component _jbpns_2fKundenport
al_2fStartseite_2fSmallChartPo
rtletWindowsnpbj:_viewRoot:j_id29:j_id32
javax.faces.event.AbortProcessingException: /SmallChart.xhtml @83,112 actionListener="#{SmallChartBean.sendMessage}": java.lang.Cl
assCastException: org.apache.catalina.connector.RequestFacade cannot be cast to javax.servlet.http.H
ttpServletRequestWrapper
 ...
Caused by: java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade cannot be cast
to javax.servlet.http.HttpServ
letRequestWrapper
 ...
14:55:11,540 ERROR [lifecycle] JSF1054: (Phase ID: RESTORE_VIEW 1, View ID: ) Exception thrown durin
g phase execution: javax.faces
.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@1777d1a]
14:55:11,553 ERROR [BaseXMLFilter] Exception in the filter chain
javax.servlet.ServletException: viewId:/SmallChart.xhtml - View /SmallChart.xhtml could not be resto
red.
 ...
Caused by: javax.faces.application.ViewExpiredException: viewId:/SmallChart.xhtml - View /SmallChart
.xhtml could not be restored.
 ...
14:55:11,665 ERROR [BaseXMLFilter] Exception in the filter chain
javax.servlet.ServletException: viewId:/SmallChart.xhtml - View /SmallChart.xhtml could not be resto
red.
 ...
Caused by: javax.faces.application.ViewExpiredException: viewId:/SmallChart.xhtml - View /SmallChart
.xhtml could not be restored.
 ...
14:55:11,736 ERROR [[FacesServlet]] Servlet.service() for servlet FacesServlet threw exception
javax.faces.application.ViewExpiredException: viewId:/SmallChart.xhtml - View /SmallChart.xhtml coul
d not be restored.
 ...

I am not sure what this means?
If I look at Code, it have to be a problem with the getRequest()-Methode.

Has someone an idea?

[fuchs]

I try to focus my problem.

This code should write the String guid into my ApplicationScope:

String guid = "what ever I like";
RenderRequest request = (RenderRequest)
 FacesContext.getCurrentInstance().getExternalContext().getRequest();
PortletSession portletSession = request.getPortletSession();
portletSession.setAttribute( "guid", PortletSession.PORTLET_SCOPE );

But the Request element is null.
I dont know what is wrong here.

Can someone help me, please?

[fuchs]

Does no one use the applicationScope?

[nbelaevski]

Hi,

Have you tried session map of external context?

[prabhat.jha]

JBoss Portlet Bridge User forum is a better place to discuss this.

[fuchs]

Yes prabhat.jha, I wrote the same post into the portletbridge user forum, but i got no answer.

nbelaevski would you explain, how I could use the "session map"?
If I do that, I will get the error message that the object can not be cast to.

[nbelaevski]

http://www.j2ee.me/javaee/5/docs/api/javax/faces/context/ExternalContext.html#getSessionMap()

[fuchs]

I can not cast the facesContext to the PortletSession Context.

java.lang.ClassCastException: org.jboss.portletbridge.context.FacesContextImpl cannot be cast to javax.portlet.PortletSession

I do not know, how I can go around the problem?

[nbelaevski]

Session map provides access to session attributes using Map interface. Try put() and get() methods.

[fuchs]

Thanks nbelaevski, know it works!

Writing into the ApplicationScope:

FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().put("emeterAppScope", "what i want");

Reading from the ApplicationScope:

FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("emeterAppScope");

[alexsmirnov]

I'm not sure, did you mean JSF application scope attributes, that are really stored as ServletContext/PortletContext attributes, or PortletSession application scope attributes ?
ExternalContext#applicationMap provides access to the first ones. JSF does not define exact type of the ExternalContext#request and #response attributes ( it is implementation-specific ), but portlet bridge introduces 'sessionApplicationScope' el-variable that contains Map of the PortletSession.APPLICATION_SCOPE attributes. You can use that variable to inject appropriate value into your bean property, or use Application#evaluateExpressionGet(FacesContext, String, Class<? extends T>) method from Java code.

#{sessionApplicationScope["what i want"]}

[fuchs]

thanks for this realy good information. it seems to be very helpful!