a4j:mediaOutput and Spring beans

[olibutzki]

Hi everyone,

as I use Spring Webflow I defeined Spring beans instead of managed-beans. This works great, but I think I came across a bug.

The attribute createContent of the tag a4j:mediaOutput doesn't except a getter of my bean. I get a PropertyNotfoundException.

Does anyone have a solution for this problem?

Thanks and kind regards
Lobster

[nbelaevski]

Lobster,

createContent is not a property that can have getter but method that accepts two parameters: OutputStream and Object. Can you please post page/bean code?

[olibutzki]

"nbelaevski" wrote:
Lobster,

createContent is not a property that can have getter but method that accepts two parameters: OutputStream and Object. Can you please post page/bean code?

Yes, I can:

Bean definition:

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="
 http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
 <bean id="PaintBean" class="com.package.PaintBean"/>
</beans>

The bean itself:

public class PaintBean {
 private int tileWidth;
 private int tileHeight;
 private ImageData[] imageData;

 public void paint(OutputStream out, Object data) throws IOException {
 // ...
 }

 // getters and setters
}

Usage in jspx-File

<a4j:repeat value="#{paintBean.imageData}" var="imageTile">

 <a4j:outputPanel layout="block" style="left: #{imageTile.left}px; top: #{imageTile.top}px; width: #{paintBean.tileWidth}px; height: #{paintBean.tileHeight}px">

 <a4j:mediaOutput createContent="#{paintBean.paint}" element="img" mimeType="image/png" shape="rect" standby="loading..." value="#{imageTile}" />

 </a4j:outputPanel>

</a4j:repeat>

It results in this stacktrace:

javax.faces.el.EvaluationException: /pages/views/main/richgraph.jspx @54,223 createContent="#{paintBean.paint}": Target Unreachable, identifier 'paintBean' resolved to null
 at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)
 at org.ajax4jsf.resource.UserResource.send(UserResource.java:111)
 at org.ajax4jsf.resource.ResourceLifecycle.sendResource(ResourceLifecycle.java:223)
 at org.ajax4jsf.resource.ResourceLifecycle.send(ResourceLifecycle.java:148)
 at org.ajax4jsf.resource.InternetResourceService.serviceResource(InternetResourceService.java:227)
 at org.ajax4jsf.resource.InternetResourceService.serviceResource(InternetResourceService.java:144)
 at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:265)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at de.bmiag.gear.frontend.FrontendFilter.doFilter(FrontendFilter.java:291)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
 at java.lang.Thread.run(Thread.java:595)

If I use managed-beans, everything works fine.

Thanks for your help!

[nbelaevski]

Please describe how do you wire Spring with JSF.

[olibutzki]

"nbelaevski" wrote:
Please describe how do you wire Spring with JSF.

Spring (web flow) is integrated in web.xml and faces-config.xml

web.xml

<listener>
 <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
 </listener>

 <listener>
 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>

faces-config.xml

 <application>
 <navigation-handler>org.springframework.webflow.executor.jsf.FlowNavigationHandler</navigation-handler>
 <variable-resolver>org.springframework.webflow.executor.jsf.DelegatingFlowVariableResolver</variable-resolver>
 <variable-resolver>org.springframework.web.jsf.DelegatingVariableResolver</variable-resolver>
 </application>
 <lifecycle>
 <phase-listener>org.springframework.webflow.executor.jsf.FlowPhaseListener</phase-listener>
 </lifecycle>

[olibutzki]

I forgot the reference to te Spring beans in web.xml

<context-param>
 <param-name>contextConfigLocation</param-name>
 <param-value>
 /WEB-INF/webflow-config.xml
 /WEB-INF/beans/*.xml
 </param-value>
 </context-param>

and the myfaces listener:

<listener>
 <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
 </listener>

[mdiskin]

Did anyone find a way around this issue? I tried to use a standard managedbean for the paintBean (content) and pass the Spring bean as the value but this does not work.

Any alternatives?

Thanks in advance for any assistance.
Mark