Beanに値を設定する際に、「PropertyNotWritableException：設定操作の構文が正しくありません」エラー

Question

jsfページからBeanに値を送信しようとするとこのエラーが発生します。

Beanのフィールドに値を設定してから、Airplaneインスタンスを作成してデータベースに追加します。しかし、私はBeanのセッター部分に不正な構文を使用しているというエラーが表示されます。

なぜこのエラーが発生しますか？私は私の問題を助けたこのサイトの何かを見つけられませんでした。ここで

は、JSF一部です：ここでは

<h4>Add A Plane</h4> 

       <c:if test="#{not empty listAirplaneBB.error}"> 
        <div class="alert alert-danger"> 
         <span class="glyphicon glyphicon-remove"></span> <h:outputText value="#{listAirplaneBB.error}" /> 
        </div> 
       </c:if> 
       <h:form> 
       <table class="table"> 
        <thead> 
         <tr> 
          <th>Plane Make</th> 
          <th colspan="1">Plane Model</th> 
          <th colspan="1">Plane Seats</th> 
         </tr> 
        </thead> 
        <tr>  
         <td> 
          <h:inputText value="#{addAirplaneCtrl.setMake(make)}"> 
           <f:validateLength minimum="3" /> 
          </h:inputText> 
         </td> 
         <td> 
          <h:inputText id="lastname" value="#{addAirplaneCtrl.setModel(model)}"> 
           <f:validateLength minimum="3" /> 
          </h:inputText> 
         </td> 
         <td> 
          <h:inputText value="#{addAirplaneCtrl.setSeats(seats)}"> 
           <f:validateLength minimum="1" /> 
          </h:inputText> 
         </td> 
         <td> 
          <h:commandButton value="Add Plane" class="btn btn-primary" action="#{addAirplaneCtrl.addPlane()}" /> 
         </td> 
        </tr> 
       </table> 
       </h:form> 

はBeanです：ここでは

@Named 
@RequestScoped 
public class AddAirplaneCtrl implements Serializable{ 

@Inject 
private FlightModel flightModel; 

private ListAirplaneBB listAirplaneBB; 

private String make; 
private String model; 
private String seats; 

private static final String PLANE_EXIST = "Plane already exists"; 
private static final String EMPTY_FIELDS = "Please fill in all fields"; 

protected AddAirplaneCtrl(){ 
    ; 
} 

/* 
TO DO LIST 
    error handling 
*/ 

public String addPlane(){ 

    //make sure all fields are filled, otherwise set error and return redirect false 
    if(make == null || model == null || seats == null){ 
     listAirplaneBB.setError(EMPTY_FIELDS); 
     return "/private/admin/admincenter?faces-redirect=false"; 
    } 

    //create planeId 
    String pId = make.substring(0, 1); 
    pId += model; 

    //upload photo in new method [Meet requirements, rename photoID planeId, upload to folder] 

    //check if exist 
    List<Airplane> airplaneList = flightModel.getAirplaneList().getByAirplaneId(pId); 
    if(!airplaneList.isEmpty()){ 
     listAirplaneBB.setError(PLANE_EXIST); 
     return "/private/admin/admincenter?faces-redirect=false"; 
    } 

    //add plane 
    Airplane airplane = new Airplane(make, model, pId, seats); 
    flightModel.getAirplaneList().create(airplane); 
    return "/private/admin/admincenter?faces-redirect=true"; 
} 

public String deleteAirplane(String planeId){ 
    return ""; 
} 

/** 
* @param make the make to set 
*/ 
public void setMake(String make) { 
    this.make = make; 
} 

/** 
* @param model the model to set 
*/ 
public void setModel(String model) { 
    this.model = model; 
} 

/** 
* @param seats the seats to set 
*/ 
public void setSeats(String seats) { 
    this.seats = seats; 
} 

}

は誤りです：

javax.faces.component.UpdateModelException: javax.el.PropertyNotWritableException: /private/admin/admincenter.xhtml @118,87 value="#{addAirplaneCtrl.setMake(make)}": 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.UIForm.processUpdates(UIForm.java:281) 
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286) 
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286) 
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.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) 
at edu.cth.dzenkyair.frontend.auth.AdminFilter.doFilter(AdminFilter.java:40) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) 
at edu.cth.dzenkyair.frontend.auth.UserFilter.doFilter(UserFilter.java:39) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316) 
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:415) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282) 
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:201) 
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175) 
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:284) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112) 
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561) 
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$Worker.doWork(AbstractThreadPool.java:565) 
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: javax.el.PropertyNotWritableException: /private/admin/admincenter.xhtml @118,87 value="#{addAirplaneCtrl.setMake(make)}": 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) 
... 45 more 
Caused by: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation 
at com.sun.el.parser.AstValue.setValue(AstValue.java:228) 
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) 
... 46 more 

Answer 1

JSFマネージドBeanはすなわち、は、シリアライズ、カプセル化と

のFaceletsは式言語を通じて管理対象Beanと通信することができますし、使用する空のコンストラクタを実装するために、豆の基準を使用して、ManagedBeansを使用していますセッターwith any EditableValueHolder UIComponent。あなたのケースでは

、使用しているEditableValueHolderは、あなたがvalue=""属性を使用する場合、セッターを呼び出すための正しい方法は、ちょうどあなたが設定しようとしているプロパティの名前を使用することで、<h:inputText />コンポーネントですここでの例です：

豆：

@Named or @ManageBean 
@some_scope 
public class YourBean implements Serializable{ 

private String make; 

public void setMake(String make){ 
    this.make = make; 
} 

public String getMake(){ 
    return this.make; 
} 

} 

にfacelet：

// will call the setMake(String make) method 
<h:inputText value="#{yourBean.make}" /> 

// will call the getMake() method 
<h:outputText value="#{yourBean.make}" /> 

Answer 2

あなたがする必要がいけません「set」記述を書く式言語のイオンは、あなただけの

<h:inputText value="#{addAirplaneCtrl.make}">

を記述する必要があり、その後、JSFを使用すると、inputTextコンポーネントの上に置く原因、提出にあなたのBeanのメソッドのsetMakeを見つけようとします。