ArrayIndexOutOfBoundsException when handling array on view

Question

actualy my question is how to display a collection in my view : ex:

<h:outputText value="#{item.machineCollection.get(0).id != null ? item.machineCollection.get(0).id : ''}"/>

even after testing my code if the result is null i got this error

Array index out of range: 0

java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0 at java.util.Vector.get(Vector.java:694) at org.eclipse.persistence.indirection.IndirectList.get(IndirectList.java:401) at sun.reflect.GeneratedMethodAccessor194.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:779) at javax.el.BeanELResolver.invoke(BeanELResolver.java:528) at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:257) at com.sun.el.parser.AstValue.getValue(AstValue.java:134) at com.sun.el.parser.AstValue.getValue(AstValue.java:183) at com.sun.el.parser.AstNotEqual.getValue(AstNotEqual.java:58) at com.sun.el.parser.AstChoice.getValue(AstChoice.java:64) at com.sun.el.parser.AstDeferredExpression.getValue(AstDeferredExpression.java:63) at com.sun.el.parser.AstCompositeExpression.getValue(AstCompositeExpression.java:68) at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224) at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) at javax.faces.component.UIOutput.getValue(UIOutput.java:169) at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760) at org.primefaces.component.datatable.DataTableRenderer.encodeRegularCell(DataTableRenderer.java:741) at org.primefaces.component.datatable.DataTableRenderer.encodeRow(DataTableRenderer.java:693) at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:601) at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:220) at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:192) at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:74) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:59) at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:43) at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:198) at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:115) at org.primefaces.component.panel.PanelRenderer.encodeEnd(PanelRenderer.java:55) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764) at javax.faces.render.Renderer.encodeChildren(Renderer.java:168) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845) at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:55) at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:43) at org.primefaces.component.layout.LayoutUnitRenderer.encodeEnd(LayoutUnitRenderer.java:51) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:680)

if someone have a solution urgently pleas and thanks

You simple have a empty list on your page. check your server side code — NullPointerException, May 20 '13 at 13:34

Simon · Accepted Answer · 2013-05-20T13:53:01.290

2

The problem is that you have

item.machineCollection.get(0).id

If you have an empty collection, item.machineCollection.get(0) will not work.

In primeface datatable you can use the var attribute. So if you add var="row" you can do

<p:datatable var="row" value="#{item.machineCollection}" >
    <p:column>
        <f:facet name="header">
            <h:outputText value="Id" />
        </f:facet>
        <h:outputText value="#{row.id}"/>
    </p:column>
....
</p:datatable>

edited May 20 '13 at 13:53

answered May 20 '13 at 13:32

Simon

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ok but, how to get it if not null and return nothing if null without error ? – MeursaultF May 20 '13 at 13:37
I'm not sure exactly what you wanted to do, but from your code and stack trace I'm guessing it's something similar to this. (I updated my answer) – Simon May 20 '13 at 13:54
@user1643422 if the list is empty (i.e. it has `null` value or it doesn't contain any item) then the `` won't display anything at all. – Luiggi Mendoza May 20 '13 at 14:16
2

@user1643422 please use `@username` to answer a comment. The problem looks that your managed bean has a wrong scope, make sure it is at least `@ViewScoped`. – Luiggi Mendoza May 20 '13 at 14:56

score 0 · Answer 2 · edited May 23 '17 at 12:05

0

Use not empty operator:

<h:outputText value="#{not empty item.machineCollection ? item.machineCollection.get(0).id : ''}

or write custom JSF function, as described in this topic:

How to create a custom EL function to invoke a static method?

edited May 23 '17 at 12:05

Community

1
1

answered May 20 '13 at 13:56

Danubian Sailor

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i tryed #{! empty item.machineCollection.get(0).libelle} but range 0 exception come back .. :s – MeursaultF May 20 '13 at 14:43
`#{! empty item.machineCollection.get(0).libelle}` – MeursaultF May 20 '13 at 15:23

ArrayIndexOutOfBoundsException when handling array on view

2 Answers2