我正在使用primefaces.org创建一个Java EE + JSF应用程序，我得到一个我无法解决的异常。
以下是我得到的例外情况：
2017-10-20T11:45:10.085+0200|Severe: javax.faces.component.UpdateModelException: javax.el.PropertyNotWritableException: /enterpriseEditor.xhtml @59,54 value="#{enterpriseEditor.selectedCountry} ": Illegal Syntax for Set Operation
at javax.faces.component.UIInput.updateModel(UIInput.java:866)
at javax.faces.component.UIInput.processUpdates(UIInput.java:749)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1291)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1291)
at org.primefaces.util.ComponentUtils.processUpdatesOfFacetsAndChilds(ComponentUtils.java:283)
at org.primefaces.component.api.UITabPanel.processUpdates(UITabPanel.java:1108)
at org.primefaces.component.tabview.TabView.processUpdates(TabView.java:337)
at javax.faces.component.UIForm.processUpdates(UIForm.java:281)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1291)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1291)
at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1254)
at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
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:748)
Caused by: javax.el.PropertyNotWritableException: /enterpriseEditor.xhtml @59,54 value="#{enterpriseEditor.selectedCountry} ": Illegal Syntax for Set Operation
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:136)
at javax.faces.component.UIInput.updateModel(UIInput.java:832)
... 42 more
Caused by: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
at com.sun.el.parser.SimpleNode.setValue(SimpleNode.java:168)
at com.sun.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:294)
at org.jboss.weld.el.WeldValueExpression.setValue(WeldValueExpression.java:64)
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131)
... 43 more
以下是来自enterpriseEditor.xhtml的标记：例外情况：
<p:selectOneMenu id="country" value="#{enterpriseEditor.selectedCountry} ">
<f:selectItems value="#{enterpriseEditor.countries}"
var="country" itemLabel="#{country.countryName}" itemValue="#{country}" />
</p:selectOneMenu>
这是标记背后的支持bean
@Named("enterpriseEditor")
@ViewScoped
public class EnterpriseEditor implements Serializable {
private static final long serialVersionUID = 7623690881971066425L;
private Enterprise enterprise;
private List<Country> countries;
private Country selectedCountry;
public EnterpriseEditor() {
}
public List<Country> getCountries() {
return countries;
}
public void setCountries(List<Country> countries) {
this.countries = countries;
}
public Country getSelectedCountry() {
return selectedCountry;
}
public void setSelectedCountry(Country selectedCountry) {
this.selectedCountry = selectedCountry;
}
非常感谢任何帮助。