javax.el.PropertyNotWritableException: Die Klasse 'com.example.Bean' nicht über eine beschreibbare Eigenschaft 'foo'

Question

I unter JSF Eingabekomponente haben:

<h:inputText value="#{bean.foo}" /> 

Welche dieser Eigenschaft gebunden ist:

private String foo; 

public String getFoo() { 
    return foo; 
} 

private void setFoo(String foo) { 
    this.foo = foo; 
} 

Wenn sie das Formular absenden, unter Ausnahme ausgelöst wird:

javax.faces.component.UpdateModelException: javax.el.PropertyNotWritableException: /foo.xhtml @12,34 value="#{bean.foo}": The class 'com.example.Bean' does not have a writable property 'foo'. 
    at javax.faces.component.UIInput.updateModel(UIInput.java:867) 
    at javax.faces.component.UIInput.processUpdates(UIInput.java:749) 
    at javax.faces.component.UIForm.processUpdates(UIForm.java:281) 
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1289) 
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1289) 
    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:646) 
    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:357) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188) 
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168) 
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189) 
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838) 
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544) 
    at java.lang.Thread.run(Thread.java:745) 

Wie dies verursacht wird, und wie kann ich es lösen?

Answer 1

javax.el.PropertyNotWritableException: Die Klasse 'com.example.Bean' nicht über eine beschreibbare Eigenschaft 'foo'

Dies bedeutet, dass die Setter-Methode kann nicht gefunden werden.

In der Tat ist Ihre Setter-Methode nicht public.

private void setFoo(String foo) { 
    this.foo = foo;  
} 

Um dieses Problem zu lösen, ist es public machen:

public void setFoo(String foo) { 
    this.foo = foo;  
}