Custom EL Functions and JSF/Richfaces/Ajax4JSF

[roykachouh]

Has anyone had any success implmeneting a custom function using the richfaces/ajax4jsf framework?

I am trying to simplify my development by creating a custom function that will return the size of a collection. Since the collection size method does not implement standard java bean practices.

At first, I tried using the JSTL fn function as so: #{fn:length(TeamApi.teamsOwnedByAccount) gt 3}

This seems to work only on a regular HTTP request. If the request is ajaxified using ajax4jsf I get a messages stating that the fn:length function is not found.

I thought this might have to do with some issues between JSF and JSTL interoperability, so I creating my own function that does the same thing.

However, the same issues arises...the function works on a regular request, but breaks with ajax4jsf request. Is there something with filter order that I am missing, or is it something else...

<h:outputText value="Team Comments (${ltp:getCollectionSize(TeamApi.detailTeam.commentList)})" />

[roykachouh]

btw...I am using Richfaces 3.3.1.GA

[nbelaevski]

Hi,

There are several functions shipped with RF, they work ok. Are you using JBoss AS? What exact message about function not found do you see?

[roykachouh]

Hey, thanks for the reply!

Yes I am using JBoss AS 4.2.2. The exact stacktrace is below...it looks like it is a classloading issue...

I have my jsf_facelets.jar in WEB-INF/lib

In fact, I will just include all the jars I have in my lib...

antlr.jar
asm.jar
cglib.jar
commons-beanutils.jar
commons-collections-3.2.jar
commons-collections.jar
commons-dbcp-1.2.2.jar
commons-digester.jar
commons-lang.jar
commons-logging.jar
commons-pool-1.3.jar
dom4j.jar
gdata-appsforyourdomain-1.0.jar
gdata-appsforyourdomain-meta-1.0.jar
gdata-base-1.0.jar
gdata-calendar-1.0.jar
gdata-calendar-meta-1.0.jar
gdata-client-1.0.jar
gdata-client-meta-1.0.jar
gdata-codesearch-1.0.jar
gdata-codesearch-meta-1.0.jar
gdata-contacts-1.0.jar
gdata-contacts-meta-1.0.jar
gdata-core-1.0.jar
gdata-docs-1.0.jar
gdata-docs-meta-1.0.jar
gdata-media-1.0.jar
gdata-photos-1.0.jar
gdata-photos-meta-1.0.jar
gdata-spreadsheet-1.0.jar
gdata-spreadsheet-meta-1.0.jar
gdata-youtube-1.0.jar
log4j-1.2.13.jar
spring.jar
hibernate.jar
velocity-1.5.jar
velocity-tools-view-1.4.jar
jbossmq-client.jar
gdata-youtube-meta-1.0.jar
hibernate-annotations.jar
mysql-connector-java-5.0.8-bin.jar
jug-asl-2.0.0.jar
richfaces-api-3.3.1.GA.jar
richfaces-impl-3.3.1.GA.jar
richfaces-ui-3.3.1.GA.jar
jsf-facelets.jar

Here is the stack trace...

javax.faces.FacesException: javax.el.ELException: /parks/widgets/parkCommentsWidget.xhtml @11,133 value="Park Comments (#{fn:length(ParkApi.createdPark.commentList)})": Function 'fn:length' not found
 at javax.faces.component.UIOutput.getValue(UIOutput.java:176)
 at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:189)
 at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:320)
 at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:200)
 at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
 at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:281)
 at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:166)
 at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:83)
 at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:157)
 at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:83)
 at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:157)
 at org.ajax4jsf.renderkit.AjaxContainerRenderer.encodeAjax(AjaxContainerRenderer.java:123)
 at org.ajax4jsf.component.AjaxViewRoot.encodeAjax(AjaxViewRoot.java:677)
 at org.ajax4jsf.component.AjaxViewRoot.encodeChildren(AjaxViewRoot.java:548)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
 at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:577)
 at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
 at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
 at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
 at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
 at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at com.asc.ltp.web.filters.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:77)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
 at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
 at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:368)
 at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:495)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
 at com.asc.ltp.web.filters.MyOpenSessionInViewFilter.doFilterInternal(MyOpenSessionInViewFilter.java:26)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at com.asc.ltp.web.filters.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:77)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 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:230)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
 at java.lang.Thread.run(Thread.java:595)
Caused by: javax.el.ELException: /parks/widgets/parkCommentsWidget.xhtml @11,133 value="Park Comments (#{fn:length(ParkApi.createdPark.commentList)})": Function 'fn:length' not found
 at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)
 at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
 ... 60 more
09:03:04,638 ERROR [STDERR] java.lang.ClassNotFoundException: No ClassLoaders found for: com.sun.facelets.tag.jstl.fn.JstlFunction
09:03:04,638 ERROR [STDERR] at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
09:03:04,638 ERROR [STDERR] at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
09:03:04,638 ERROR [STDERR] at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
09:03:04,638 ERROR [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
09:03:04,638 ERROR [STDERR] at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
09:03:04,638 ERROR [STDERR] at java.lang.Class.forName0(Native Method)
09:03:04,638 ERROR [STDERR] at java.lang.Class.forName(Class.java:164)
09:03:04,638 ERROR [STDERR] at org.apache.el.lang.FunctionMapperImpl$Function.getMethod(FunctionMapperImpl.java:147)
09:03:04,638 ERROR [STDERR] at org.apache.el.lang.FunctionMapperImpl.resolveFunction(FunctionMapperImpl.java:53)
09:03:04,638 ERROR [STDERR] at org.apache.el.parser.AstFunction.getValue(AstFunction.java:71)
09:03:04,638 ERROR [STDERR] at org.apache.el.parser.AstDeferredExpression.getValue(AstDeferredExpression.java:26)
09:03:04,638 ERROR [STDERR] at org.apache.el.parser.AstCompositeExpression.getValue(AstCompositeExpression.java:31)
09:03:04,638 ERROR [STDERR] at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
09:03:04,638 ERROR [STDERR] at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
09:03:04,638 ERROR [STDERR] at sun.reflect.GeneratedMethodAccessor632.invoke(Unknown Source)
09:03:04,638 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
09:03:04,638 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.util.DevTools.writeAttributes(DevTools.java:240)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.util.DevTools.writeStart(DevTools.java:284)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.util.DevTools.writeComponent(DevTools.java:189)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.util.DevTools.writeComponent(DevTools.java:207)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.util.DevTools.writeComponent(DevTools.java:207)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.util.DevTools.debugHtml(DevTools.java:107)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.FaceletViewHandler.handleRenderException(FaceletViewHandler.java:677)
09:03:04,638 ERROR [STDERR] at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:645)
09:03:04,638 ERROR [STDERR] at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
09:03:04,638 ERROR [STDERR] at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
09:03:04,653 ERROR [STDERR] at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
09:03:04,653 ERROR [STDERR] at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
09:03:04,653 ERROR [STDERR] at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
09:03:04,653 ERROR [STDERR] at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at com.asc.ltp.web.filters.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:77)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
09:03:04,653 ERROR [STDERR] at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
09:03:04,653 ERROR [STDERR] at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:368)
09:03:04,653 ERROR [STDERR] at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:495)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
09:03:04,653 ERROR [STDERR] at com.asc.ltp.web.filters.MyOpenSessionInViewFilter.doFilterInternal(MyOpenSessionInViewFilter.java:26)
09:03:04,653 ERROR [STDERR] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at com.asc.ltp.web.filters.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:77)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
09:03:04,653 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
09:03:04,653 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
09:03:04,653 ERROR [STDERR] at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
09:03:04,653 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
09:03:04,653 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
09:03:04,653 ERROR [STDERR] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
09:03:04,653 ERROR [STDERR] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
09:03:04,653 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)

[nbelaevski]

That should help: http://www.jboss.org/index.html?module=bb&op=viewtopic&t=144620&start=10

[roykachouh]

That did the trick thanks!!

[roykachouh]

Hey Nick! Again, thanks for the help on the issue with EL functions!

I have another question for you...I hope you are watching this topic. To cover myself, I will create another new topic, but I thought you might be able to help me because I was navigating some RichFaces code and saw your name on one of the classes that I was investigating (DragSupportHandler).

I am trying to extend the datascroller richfaces component. I want to add some of my own behavior to this component. So what I did was I added a component in my application library by extending the abstracttaglibrary as so...

public class LtpLibrary extends AbstractTagLibrary {

 public final static String Namespace = "http://mysite.com/core";

 public LtpLibrary() {
 super(Namespace);


 this.addComponent("ltpDataScroller",LtpDataScroller.COMPONENT_ID,"org.richfaces.DataScrollerRenderer",LtpDataScrollerHandler.class);


 }

}

Inside my custom LTP datascroller, I have a custom pagination handler attribute that gets set. The attribute gets sets fine on the initial request, however when I try to page, the attribute does not get set, and a null pointer exception is thrown as a result. I will add as much code as possible to make clear the issue.

My AjaxComponentHandler...

public class LtpDataScrollerHandler extends AjaxComponentHandler {

 private final TagAttribute scrollerListener;
 private final TagAttribute paginator;
 public LtpDataScrollerHandler(ComponentConfig config) {
 super(config);
 this.scrollerListener = this.getAttribute("scrollerListener");
 this.paginator = this.getAttribute("paginator");
 }

 @Override
 protected UIComponent createComponent(FaceletContext ctx) {
 return ctx.getFacesContext().getApplication().createComponent(LtpDataScroller.COMPONENT_ID);
 }

 @Override
 protected void setAttributes(FaceletContext ctx, Object obj) {
 LtpDataScroller scroller = (LtpDataScroller)obj;
 ExpressionFactory expressionFactory = ctx.getExpressionFactory();

 if(this.scrollerListener!=null){
 MethodExpression expression = expressionFactory.createMethodExpression(ctx, scrollerListener.getValue(), null, new Class[] {DataScrollerEvent.class});
 scroller.setScrollerListener(expression);
 }
 if(this.paginator!=null){
 ValueExpression ve = expressionFactory.createValueExpression(ctx, paginator.getValue(), Paginator.class);
 Paginator paginator = (Paginator) ve.getValue(ctx);
 scroller.setPaginator(paginator);
 }


 }

 @Override
 protected MetaRuleset createMetaRuleset(Class type) {
 return super.createMetaRuleset(type);
 }
}

The class that extends the HTMLDataScroller...

public class LtpDataScroller extends HtmlDatascroller{

 public static final String COMPONENT_ID = "com.asc.ltp.web.components.LtpDataScroller";
 private Paginator paginator;
 @Override
 public int getPageCount() {
 int pageCount = 0;

 PaginationConfig config = new DefaultPaginationConfig(5,3);

 pageCount = paginator.determinePageCount(config);

 return pageCount;
 }

 public Paginator getPaginator() {
 return paginator;
 }
 public void setPaginator(Paginator paginator) {
 this.paginator = paginator;
 }

 /*@Override
 public boolean isRendered() {
 return paginator.shouldRender();
 }*/
}

Is there something I am missing? Why does my paginator attribute get set on the inital rendering, but does not for subsequent ajax requests?

Your help is really appreciated on this one...

[roykachouh]

Nevermind the last one...i figured it out...

the component did not like when i overrode the following two methods of UIDatascroller...

public int getPageCount(UIData data);
public int getPageCount(UIData data, int rowCount, int rows) ;