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在我的JSF/PrimeFaces迷你web项目中，我想使用下拉列表选择Enum项目，然后在填写'create'表单时将它们添加到数据库中。
我使用Netbeans从数据库创建一个实体类，然后用PrimeFaces作为模板向导向导'实体类的JSF页面'。这会自动创建创建/编辑/列表/查看xhtml页面。 目前，我已经有了：如何在p：selectOneMenu中使用枚举
枚举类：
public enum InterestsEnum {
FOOTBALL,
SKIING,
CYCLING,
MUSIC;
}
实体类：
@Entity
public class Person implements Serializable {
@Column(name="ID")
@Id
@NotNull
@GeneratedValue(strategy = GenerationType.AUTO)
private Long personId;
@Column(name="FIRSTNAME")
@Basic(optional=false)
@NotNull
@Size(min=1,max=45)
private String firstName;
@Column(name="SURNAME")
@Basic(optional=false)
@NotNull
@Size(min=1,max=45)
private String surname;
@ElementCollection(fetch = FetchType.EAGER, targetClass = InterestsEnum.class)
@JoinTable(name = "Person_INTERESTS", joinColumns = @JoinColumn(name = "PERSON_ID"))
@Column(name = "INTERESTS", nullable = false)
@Enumerated(EnumType.STRING)
Collection<InterestsEnum> interests;
//Getters and Setters:
托管Bean：
@ManagedBean
@ApplicationScoped
public class Data {
public InterestsEnum[] getInterests() {
return InterestsEnum.values();
}
}
PrimeFaces创建页面提取：
<p:selectOneMenu value="#{person.interests}" >
<f:selectItems value="#{InterestsEnum}" />
</p:selectOneMenu>
PrimeFaces列表页提取物：
<p:column>
<f:facet name="header">
<h:outputText value="#{bundle.ListPersonTitle_interests}"/>
</f:facet>
<h:outputText value="#{item.interests}"/>
</p:column>
当我运行该项目，直到我打开 '列表'，没有任何错误，当出现以下情况：
Severe: Error Rendering View[/person/List.xhtml]
javax.faces.FacesException: Cannot find component with expression "interests" referenced from "PersonCreateForm:j_idt34".
at org.primefaces.expression.SearchExpressionFacade.resolveComponentInternal(SearchExpressionFacade.java:422)
at org.primefaces.expression.SearchExpressionFacade.resolveComponent(SearchExpressionFacade.java:266)
at org.primefaces.expression.SearchExpressionFacade.resolveComponent(SearchExpressionFacade.java:228)
at org.primefaces.component.outputlabel.OutputLabelRenderer.encodeEnd(OutputLabelRenderer.java:47)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeDynamicBody(PanelGridRenderer.java:89)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeBody(PanelGridRenderer.java:60)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeEnd(PanelGridRenderer.java:49)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:114)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:582)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at javax.faces.component.UIForm.visitTree(UIForm.java:381)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:322)
at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:60)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:432)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
at java.lang.Thread.run(Thread.java:745)
如果我提交了“创造”的形式我得到的以下错误：
Severe: javax.faces.component.UpdateModelException: javax.el.PropertyNotFoundException: /person/Create.xhtml @24,71 value="#{Person.interests}": Target Unreachable, identifier 'Person' resolved to null
没有下拉列表来选择Enum选项（请参阅截图）。此外'列表'显示所有的枚举成员，而不仅仅是一个。
做你把''到另一个呢？应该有一个'' –
我原来是这样，结果相同。我应该说我刚开始使用PrimeFaces，所以我可能犯了错误。 –
把你的标题，在谷歌过去，看看stackoverflow命中，并找到一个大upvoted重复 – Kukeltje