ui:repeatタグを使用してエンティティオブジェクトのコレクションを反復処理しようとしています。エンティティオブジェクトのコレクションを反復処理している間、反復可能オブジェクトはタイプ.のentityIdsを提供し java.lang.Integerます。Javaクラスでを正常に反復できIterable<Integer>ますが、EL（式言語）内でui:repeat'svalue属性を使用してこの反復可能を使用すると、ページレンダリングが失敗して次の例外が発生します。
SEVERE: Error Rendering View[/channelPages.xhtml]
javax.el.ELException: /channelPages.xhtml: Cannot convert px10.BusinessLayer.DBExecutions.ColNames_Iterable@4ae65b of type class px10.BusinessLayer.DBExecutions.ColNames_Iterable to class java.lang.Long
at com.sun.faces.facelets.compiler.AttributeInstruction.write(AttributeInstruction.java:96)
at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:54)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:45)
at org.primefaces.component.datalist.DataListRenderer.encodeList(DataListRenderer.java:148)
at org.primefaces.component.datalist.DataListRenderer.encodeMarkup(DataListRenderer.java:85)
at org.primefaces.component.datalist.DataListRenderer.encodeEnd(DataListRenderer.java:49)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:61)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:45)
at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:185)
at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:108)
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:1763)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
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:1539)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at px10.Security.AuthenticationFilter.doFilter(AuthenticationFilter.java:48)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
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 com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
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:662)
Caused by: java.lang.IllegalArgumentException: Cannot convert px10.BusinessLayer.DBExecutions.ColNames_Iterable@4ae65b of type class px10.BusinessLayer.DBExecutions.ColNames_Iterable to class java.lang.Long
at com.sun.el.lang.ELSupport.coerceToNumber(ELSupport.java:293)
at com.sun.el.lang.ELSupport.equals(ELSupport.java:154)
at com.sun.el.lang.ELSupport.compare(ELSupport.java:77)
at com.sun.el.parser.AstLessThan.getValue(AstLessThan.java:62)
at com.sun.el.parser.AstChoice.getValue(AstChoice.java:60)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)
at com.sun.faces.facelets.el.ELText$ELTextVariable.toString(ELText.java:214)
at com.sun.faces.facelets.compiler.AttributeInstruction.write(AttributeInstruction.java:89)
... 58 more
Iterableこれは、エンティティのコレクション内のentityObjectsのIDを反復処理するときに使用される私の実装です。
public class ColNames_Iterable<N> implements Iterable<N> {
private List<HColumn> columnsList;
public ColNames_Iterable(List<HColumn> columnsList) {
this.columnsList = columnsList;
}
@Override
public Iterator<N> iterator() {
return new ColNamesIterator(columnsList.iterator());
}
public int getSize() {
return columnsList.size();
}
public class ColNamesIterator<K, N, V> implements Iterator<N> {
private Iterator<HColumn<N, V>> original;
public ColNamesIterator(Iterator<HColumn<N, V>> original) {
this.original = original;
}
@Override
public N next() {
return original.next().getName();
}
@Override
public boolean hasNext() {
return original.hasNext();
}
@Override
public void remove() {
original.remove();
}
}
}
ただし、別のIterable（実際にはArraylist）が正常に反復されていることがわかりました。しかし、私の反復可能オブジェクトの反復は、Javaクラス内でも成功しますが、EL内では成功しません。
使用：
Glassfish3.1上のJSF2.1.6