java - 使用@ManagedProperty 在托管bean 之间调用方法

Question

我有两个 jsf Controller ，分别是 ControllerA 和 ControllerB。两者都在 session 范围内。我想从 ControllerA 调用 ControllerB 中的创建方法。我用了@ManagedProperty来做。但是好像不行

@ManagedBean(name = "manageAccountController")
@SessionScoped
public class ControllerA implements Serializable{

    public void accountSetup()
    {
        @ManagedProperty(value="#{controllerB}")
        private ControllerB details;
        System.out.print("Inside  controller ");
        details.create();

    }

}

    public String prepareCreate() {
          System.out.print("Inside prepare create ");
        current = new ControllerB();
        selectedItemIndex = -1;
        return "Create";
    }

    public String create() {
        try {
            System.out.print("Inside create ");
            getJpaController().create(current);
            JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("Created"));
            return prepareCreate();
        } catch (Exception e) {
            JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
            return null;
        }
    }

我无法调用 controllerB 中的方法。控制台显示以下错误

    SEVERE: JSF will be unable to create managed bean controllerA  when it is requested.  The following problems where found:
     - Property detailsXX for managed bean controllerA does not exist.  Check that appropriate getter and/or setter methods exist.
     - Property detailsXXX for managed bean controllerA does not exist.  Check that appropriate getter and/or setter methods exist.
WARNING: Unable to create managed bean controllerA.  The following problems were found:
     - Property detailsXX for managed bean controllerA does not exist.  Check that appropriate getter and/or setter methods exist.
     - Property detailsXXX for managed bean controllerA does not exist.  Check that appropriate getter and/or setter methods exist.
com.sun.faces.mgbean.ManagedBeanCreationException: Unable to create managed bean controllerA.  The following problems were found:
     - Property detailsXX for managed bean controllerA does not exist.  Check that appropriate getter and/or setter methods exist.
     - Property detailsXXX for managed bean controllerA does not exist.  Check that appropriate getter and/or setter methods exist.
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:265)
    at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:99)
    at com.sun.el.parser.AstValue.getTarget(AstValue.java:127)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:217)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    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:619)

请指出我的错误...谢谢

Answer 1

答案已经在异常消息中:

Property detailsXX for managed bean controllerA does not exist. Check that appropriate getter and/or setter methods exist.

您需要为属性提供 getter 和 setter。

@ManagedBean("manageAccountController")
@SessionScoped
public class ControllerA implements Serializable{

    @ManagedProperty("#{controllerB}")
    private ControllerB details;

    public ControllerB getDetails() {
        return details;
    }

    public void setDetails(ControllerB details) {
        this.details = details;
    }

}

另请注意，我将托管属性声明从 accountSetup() 方法移回到类中。然而，这不会导致您得到异常，而是导致一个简单的编译错误。以后请谨慎准备题中的代码，以免误入歧途。