如何解决javax.el.MethodNotFoundException

时间：2019-05-08 11:27:20

标签： java jpa jsf

我正在尝试使用JSF和JPA开发一个简单的CRUD操作。我已经开发了创建操作和读取操作。现在，我正在尝试执行删除操作，但是在尝试删除时出现此错误

 javax.el.MethodNotFoundException: /index.xhtml @54,25 action="#{book.removeBook(book)}": Method not found: it.crud.data.Book@3bc35357.removeBook(it.crud.data.Book)
javax.faces.FacesException: #{book.removeBook(book)}: javax.el.MethodNotFoundException: /index.xhtml @54,25 action="#{book.removeBook(book)}": Method not found: it.crud.data.Book@3bc35357.removeBook(it.crud.data.Book)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:110)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIData.broadcast(UIData.java:1108)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    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:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.openejb.server.httpd.EEFilter.doFilter(EEFilter.java:65)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.tomee.catalina.OpenEJBSecurityListener$RequestCapturer.invoke(OpenEJBSecurityListener.java:97)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

实体类：

@Entity
@Table(name="book")
public class Book {

    private Integer id_book;
    private String name;
    private String author;
    private String category;
    private String year;
    private String price;

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id_book")
    public Integer getId_book() {
        return id_book;
    }
    public void setId_book(Integer id_book) {
        this.id_book = id_book;
    }

    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @Column(name="author")
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }

    @Column(name="category")
    public String getCategory() {
        return category;
    }
    public void setCategory(String category) {
        this.category = category;
    }

    @Column(name="year")
    public String getYear() {
        return year;
    }
    public void setYear(String year) {
        this.year = year;
    }

    @Column(name="price")
    public String getPrice() {
        return price;
    }
    public void setPrice(String price) {
        this.price = price;
    }


}

Bean类：

@Stateless
public class BookBean implements BookLocal, BookRemote {

    @PersistenceContext(unitName="CRUDPersistence")
    private EntityManager entityManager;

    public void createBook(Book book) {
        this.entityManager.persist(book);
    }

    public List<Book> readContatti(){
        return entityManager.createQuery("SELECT b FROM Book b").getResultList();
    }

    public void deleteBook(Book book) {
        this.entityManager.remove(book);
    }
}

托管bean：

@ManagedBean(name="book")
@RequestScoped
public class BookManagedBean implements Serializable {


    private static final long serialVersionUID = 1L;
    private Book b;

    @EJB
    private BookLocal bookBusiness;

    public BookManagedBean() {
        b = new Book();
    }

    public Book getB() {
        return b;
    }

    public void setB(Book b) {
        this.b = b;
    }

    public void storeBook() {
        bookBusiness.createBook(b);
    }

    public List<Book> getBooks(){

        return bookBusiness.readContatti();
    }

    public String removeBook(Book b) {
        bookBusiness.deleteBook(b);
        return "index.xhtml?faces-redirect=true";
    }
}

index.xhtml：

<!DOCTYPE html>
<html xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://primefaces.org/ui">
<link rel="stylesheet"
    href="https://use.fontawesome.com/releases/v5.8.1/css/all.css" integrity="sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin="anonymous" />
<h:head>
    <title>Book</title>
</h:head>
<h:body>
    <h1>Book</h1>
    <h:form>
        <h:panelGrid columns="12" cellpadding="5">
            <h:outputText value="Name " />
            <ui:inputText value="#{book.b.name}" />
            <h:outputText value="Author " />
            <ui:inputText value="#{book.b.author}" />
            <h:outputText value="Category " />
            <ui:inputText value="#{book.b.category}" />
            <h:outputText value="Year " />
            <ui:inputText value="#{book.b.year}" />
            <h:outputText value="Price " />
            <ui:inputText value="#{book.b.price}" />
            <ui:commandButton value="Add" icon="fa fa-fw fa-plus"
                action="#{book.storeBook()}" />
        </h:panelGrid>
    </h:form>

    <h:form id="form">
        <ui:dataTable value="#{book.books}" var="book"
            style="margin: 2em;" rowKey="#{book.id}">
            <ui:column headerText="Name">
                <h:outputText value="#{book.name}" />
            </ui:column>
            <ui:column headerText="Year">
                <h:outputText value="#{book.year}" />
            </ui:column>
            <ui:column headerText="Author">
                <h:outputText value="#{book.author}" />
            </ui:column>
            <ui:column headerText="Category">
                <h:outputText value="#{book.category}" />
            </ui:column>
            <ui:column headerText="Price">
                <h:outputText value="$#{book.price}" />
            </ui:column>
            <ui:column style="width:100px;text-align: center">

                <ui:commandButton action="#{book.removeBook(book)}"
                    icon="fa fa-trash"></ui:commandButton>
            </ui:column>
        </ui:dataTable>
    </h:form>
</h:body>
</html>

问题出在哪里？谢谢！

1 个答案:

答案 0 :(得分：2)

数据表的var名称与您的bean名称（book）冲突。重命名任何一个。例如：

@ManagedBean(name="bookBean")

<ui:commandButton action="#{bookBean.removeBook(book)}" ../>
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