如何解决javax.el.MethodNotFoundException
我试图用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。现在我正试图实现删除操作，但是当我试图删除时，我出现了这个错误如何解决javax.el.MethodNotFoundException,java,jpa,jsf,Java,Jpa,Jsf,我试图用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。现在我正试图实现删除操作，但是当我试图删除时，我出现了这个错误 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.
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)
@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;
}
}
@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);
}
}
@无状态
公共类BookBean实现BookLocal、BookRemote{
@PersistenceContext（unitName=“CRUDPersistence”）
私人实体管理者实体管理者；
公共书籍（书籍）{
这个.entityManager.persist（书）；
}
公共列表readContatti（）{
返回entityManager.createQuery（“从书b中选择b”）.getResultList（）；
}
公共图书{
此.entityManager.remove（book）；
}
}
@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";
}
}
@ManagedBean（name=“book”）
@请求范围
公共类BookManagedBean实现可序列化{
私有静态最终长serialVersionUID=1L；
私人书籍b；
@EJB
私人书业；本地书业；
公共BookManagedBean（）{
b=新书（）；
}
公共图书{
返回b；
}
公共图书馆（b册）{
这个.b=b；
}
公共存储簿（）{
bookBusiness.createBook（b）；
}
公共列表getBooks（）{
return bookBusiness.readContatti（）；
}
公共字符串移除书（书b）{
图书业务。删除图书（b）；
返回“index.xhtml？faces redirect=true”；
}
}
<!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>
书
书
问题在哪里？谢谢 数据表var名称与bean名称冲突，两者都是
book@ManagedBean(name="bookBean")
数据表var名称与您的bean名称冲突，两者都是
book@ManagedBean(name="bookBean")
BookManagedBeanBookBookManagedBeanBook