命令按钮操作中的 MethodNotFoundException答案

【问题标题】：MethodNotFoundException in command button action命令按钮操作中的 MethodNotFoundException
【发布时间】：2012-10-28 08:38:57
【问题描述】：

当我开始使用 JSF 和 JPA 时，我在这里遇到了问题。我无法使用命令按钮向我的 EJB 中的方法发出 jsf“请求”。让我展示一下代码：

//.xhtml 页面

    <?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <h1 align="center">Bem vindo ao site do Restaurante Trabalho Final</h1>
        <h:form>
            Numero da mesa: <h:inputText id="numero" value="#{indexBean.mesa.numero}"></h:inputText>


            <h:commandButton id="insertTable" value="OK" action="#{indexBean.insereMesa(mesa)}"> 

            </h:commandButton>
        </h:form>
    </h:body>
</html>

这是我的 EJB：

package negocio;

import java.util.List;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import persistence.Mesa;


@Stateless
@LocalBean
public class MapaDeMesas {

    @PersistenceContext
    EntityManager em;

    public MapaDeMesas(){

    }

    public void insereMesa(Mesa m){
        EntityTransaction et = em.getTransaction();
        et.begin();
        em.persist(m);
        et.commit();
    }

    public List<Mesa> listarMesasDisponiveis() {
        EntityTransaction et = em.getTransaction();
        et.begin();
        Query selectAll = em.createQuery("SELECT m FROM Mesa m");
        List<Mesa> rs = selectAll.getResultList();
        et.commit();

        return rs;
    }

}

这是堆栈：

javax.faces.el.MethodNotFoundException: javax.el.MethodNotFoundException: /HomePage.xhtml @14,97 action="#{indexBean.insereMesa(mesa)}": Method insereMesa not found
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:92)
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:1550)
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 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:679)

原因：javax.el.MethodNotFoundException: /HomePage.xhtml @14,97 action="#{indexBean.insereMesa(mesa)}": 找不到方法 insereMesa 在 com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:109) 在 javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88) ... 32 更多

我不会粘贴持久化代码，为了保持帖子干净，问题不在这一层。

提前致谢！

编辑：

对不起！ ManagedBean我没贴，这里是：

package model;

import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import negocio.MapaDeMesas;
import persistence.Mesa;

@ManagedBean
@RequestScoped
public class IndexBean {

    @EJB
    private MapaDeMesas mp;
    private Mesa mesa;

    public IndexBean() {
        mesa = new Mesa();
    }

    public void insereMesa(){
        mp.insereMesa(mesa);
    }

    public void setMesa(Mesa mesa) {
        this.mesa = mesa;
    }

    public Mesa getMesa() {
        return mesa;
    }

}

但现在我遇到了另一个问题，新的堆栈跟踪就是这个，我找不到我的“getTransaction()”想法的问题？

    javax.faces.el.EvaluationException: javax.ejb.EJBException
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    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:1550)
    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 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:679)
Caused by: javax.ejb.EJBException
    at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5215)
    at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5113)
    at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4901)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2045)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1994)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:89)
    at $Proxy186.insereMesa(Unknown Source)
    at negocio.__EJB31_Generated__MapaDeMesas__Intf____Bean__.insereMesa(Unknown Source)
    at model.IndexBean.insereMesa(IndexBean.java:22)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:779)
    at javax.el.BeanELResolver.invoke(BeanELResolver.java:528)
    at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:257)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:248)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 32 more
Caused by: java.lang.IllegalStateException: A JTA EntityManager cannot use getTransaction()
    at org.hibernate.ejb.AbstractEntityManagerImpl.getTransaction(AbstractEntityManagerImpl.java:324)
    at com.sun.enterprise.container.common.impl.EntityManagerWrapper.getTransaction(EntityManagerWrapper.java:857)
    at negocio.MapaDeMesas.insereMesa(MapaDeMesas.java:26)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
    at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
    at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)
    at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
    at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
    at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360)
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)

对不起，太久了！

【问题讨论】：

标签： java jsf jpa ejb managed-bean

【解决方案1】：

编辑：好的，您刚刚使用 bean 更新了您的帖子。关于您的事务错误 - 如果您使用容器管理事务，则不能执行 bean 管理事务。您必须更新您的 persistence.xml 文件以不使用 JTA，或者只删除您的事务管理代码并让容器为您处理。

您需要将 EJB 包装在 JSF（或 CDI）托管 bean 中 - 使用 #{indexBean} 似乎您已经完成了一半，但我假设您还没有定义它？

如果您更新了 facelets 页面（删除方法参数）。

<h:commandButton id="insertTable" value="OK" action="#{indexBean.insereMesa()}">

并定义一个请求范围的托管 bean（这是一个 JSF，而不是 CDI），它注入您的 EJB 并定义一个可以从您的 facelets 页面调用的方法...

package negocio;

import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

import persistence.Mesa;

@ManagedBean
@RequestScoped
public class IndexBean {

    @EJB
    private MapaDeMesas mapaDeMesas;

    private Mesa mesa;

    public Mesa getMesa() {
        return mesa;
    }

    public void setMesa(Mesa mesa) {
        this.mesa = mesa;
    }

    /**
     * Called by the command button.
     * @return outcome
     */
    public String insereMesa(){
        mapaDeMesas.insereMesa(mesa);
        return null; // navigates to same page (change if required)
    }

}

希望这会有所帮助。

【讨论】：

【解决方案2】：

第一个错误可以通过更改facelet中的方法签名来解决。

改变

<h:commandButton id="insertTable" value="OK" 
                 action="#{indexBean.insereMesa(mesa)}">

到

<h:commandButton id="insertTable" value="OK" 
                 action="#{indexBean.insereMesa()}">

第二个错误的原因是EJB的方法被自动包装在事务中，所以你不需要调用getTransaction()、begin()和commit()。

改变

public void insereMesa(Mesa m){
    EntityTransaction et = em.getTransaction();
    et.begin();
    em.persist(m);
    et.commit();
}

到

public void insereMesa(Mesa m){
    em.persist(m);
}

这同样适用于您的其他 EJB 方法。

【讨论】：

并不是要挑剔，但为什么不直接编辑我的答案呢？我可以投票吗，我正在尝试破解 1k 代表！ :)
你已经得到了我的投票。显然我们几乎同时写了答案，而你的答案的第一个版本没有解决第二个堆栈跟踪。所以我决定写一个自己的答案。