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From Anton Gavazuk <antongava...@gmail.com>
Subject Re: Accessing multi level data from within my backing bean.
Date Mon, 13 Jul 2009 14:00:39 GMT
Jacek,

according to your error

Caused by: java.lang.NullPointerException
        at uk.co.apps2net.mfm.repository.
JdbcJobDao.getOps(JdbcJobDao.java:273)

something happens in your data layer, not in myfaces related classes

2009/7/13 Shaun Campbell <campbell.shaun@gmail.com>

> Jacek
>
> I've updated as you suggested:
>
>                       <t:dataTable value="#{jobsBean.jobs}" var="job"
>                                      styleClass="jobs" cellspacing="0"
> cellpadding="0" border="0"
>                                      rowClasses="odd,even"
> columnClasses="standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column">
>
>                             <f:facet name="caption"><h:outputText
> value="Outstanding Jobs"/></f:facet>
>
>
>                            <h:column>
>                                 <f:facet name="header">
>                                     <h:outputText value="Operations" />
>                                 </f:facet>
>
>                                 <t:dataTable value="#{job.ops}" var="op"
>                                      styleClass="jobs" cellspacing="0"
> cellpadding="0" border="0"
>                                      rowClasses="odd,even"
> columnClasses="standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column">
>
>
>                                 <h:column>
>                                     <h:outputText value="#{op.opNum}"/>
>                                 </h:column>
>
>                                 </t:dataTable>
>                             </h:column>
>
>                     </t:dataTable>
>
> I get the error:
>
> 13-Jul-2009 14:26:03 com.sun.facelets.FaceletViewHandler
> handleRenderException
> SEVERE: Error Rendering View[/jobs.xhtml]
> javax.el.ELException: /jobs.xhtml @93,202 value="#{job.ops}": Error reading
> 'ops' on type uk.co.apps2net.mfm.repository.JdbcJobDao
>         at
> com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)
>         at javax.faces.component.UIData.getValue(UIData.java:976)
>         at
> org.apache.myfaces.component.html.ext.HtmlDataTableHack.createDataModel(HtmlDataTableHack.java:437)
>         at
> org.apache.myfaces.component.html.ext.HtmlDataTable.createDataModel(HtmlDataTable.java:847)
>         at
> org.apache.myfaces.component.html.ext.HtmlDataTableHack.getDataModel(HtmlDataTableHack.java:414)
>         at
> org.apache.myfaces.component.html.ext.HtmlDataTable.getDataModel(HtmlDataTable.java:839)
>         at
> org.apache.myfaces.component.html.ext.HtmlDataTableHack.getRowCount(HtmlDataTableHack.java:87)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeInnerHtml(HtmlTableRendererBase.java:221)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlTableRendererBase.java:134)
>         at
> org.apache.myfaces.renderkit.html.ext.HtmlTableRenderer.encodeChildren(HtmlTableRenderer.java:187)
>         at
> javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:543)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:414)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChildren(RendererUtils.java:400)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils.renderChild(RendererUtils.java:417)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.renderColumnBody(HtmlTableRendererBase.java:337)
>         at
> org.apache.myfaces.renderkit.html.ext.HtmlTableRenderer.renderColumnBody(HtmlTableRenderer.java:613)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeColumnChild(HtmlTableRendererBase.java:306)
>         at
> org.apache.myfaces.renderkit.html.ext.HtmlTableRenderer.encodeColumnChild(HtmlTableRenderer.java:512)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeInnerHtml(HtmlTableRendererBase.java:282)
>         at
> org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlTableRendererBase.java:134)
>         at
> org.apache.myfaces.renderkit.html.ext.HtmlTableRenderer.encodeChildren(HtmlTableRenderer.java:187)
>         at
> javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:543)
>         at
> javax.faces.component.UIComponent.encodeAll(UIComponent.java:239)
>         at
> javax.faces.component.UIComponent.encodeAll(UIComponent.java:246)
>         at
> javax.faces.component.UIComponent.encodeAll(UIComponent.java:246)
>         at
> com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:578)
>         at
> org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
>         at
> org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:140)
>         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:152)
>         at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
>         at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>         at
> org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)
>         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:191)
>         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:286)
>         at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
>         at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
>         at
> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
>         at java.lang.Thread.run(Thread.java:619)
> Caused by: java.lang.NullPointerException
>         at
> uk.co.apps2net.mfm.repository.JdbcJobDao.getOps(JdbcJobDao.java:273)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
>         at
> javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
>         at
> org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.access$301(FacesCompositeELResolver.java:46)
>         at
> org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver$4.invoke(FacesCompositeELResolver.java:108)
>         at
> org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.invoke(FacesCompositeELResolver.java:148)
>         at
> org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:104)
>         at org.apache.el.parser.AstValue.getValue(AstValue.java:118)
>         at
> org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
>         at
> com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
>
>
>
> 2009/7/13 Jacek Bilski <jacek.bilski@gmail.com>
>
> Hi Shaun,
>>
>> Shaun Campbell wrote:
>>
>>> I have a scenario which I would have thought would have been
>>> straightforward.  I have a backing bean which provides a list of data which
>>> I am able to display to my web page using:
>>>
>>>                       <h:dataTable value="#{jobsBean.jobs}" var="job"
>>>                                 styleClass="jobs" cellspacing="0"
>>> cellpadding="0" border="0"
>>>                                     rowClasses="odd,even"
>>> columnClasses="standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column,standardTable_Column">
>>>
>>>  This all works fine but what I want to do now is do the same thing from
>>> the job variable to print out a sub list for each job.  My job class has a
>>> getOps() method which returns another list which I want to display.  No
>>> matter what I try to do to access this list I get an error.
>>>
>>
>> Can you paste here this error of yours?
>>
>> In your case I would use Tomahawks dataList for #{jobsBean.jobs}, and for
>> every job I would put dataTable with value=#{job.ops}.
>>
>> Regards
>>
>> Jacek Bilski
>>
>
>

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