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带有netbeans的Java EE

[英]Java EE with netbeans

 原文  2012-01-28 10:06:09  0   1    java/ netbeans/ maven/ glassfish/ derby

问题描述

我是一个学生，试图让我的家庭作业上班。 该项目非常简单，只有4页（xhtml），您可以登录/注销添加新项目（书籍和CD）并从数据库中查看项目。 使用derby和glassfish，所有软件均为最新版本。

问题：
项目在我的计算机上工作。 我将漏洞项目发送给我的老师，以便他可以查看该漏洞并尝试找出问题所在，他没有发现编码有问题，女巫表示我的计算机有问题。 因此，我卸载了与java，netbeans，derby，maven和glassfish有关的所有内容，然后删除了该软件的文件夹，然后再次安装，同样的问题仍然存在。 尝试使用ubuntu和virtualbox，也是一样。

Item.java 

package model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.NamedQuery;


@Entity
@NamedQuery(name = "findAllItems", query = "SELECT i FROM Item i")
public class Item {

// ======================================
// =             Attributes             =
// ======================================
@Id
@GeneratedValue
protected Long id;
protected String title;
protected Float price;
protected String description;

// ======================================
// =            Constructors            =
// ======================================

public Item() {
}

public Item(String title, Float price, String description) {
    this.title = title;
    this.price = price;
    this.description = description;
}

// ======================================
// =          Getters & Setters         =
// ======================================

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public Float getPrice() {
    return price;
}

public void setPrice(Float price) {
    this.price = price;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}
}

ItemController.java 

package model;

import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import java.util.ArrayList;
import java.util.List;


@ManagedBean
@RequestScoped
public class ItemController {

// ======================================
// =             Attributes             =
// ======================================

@EJB
private ItemEJB itemEJB;

private Book book = new Book();
private CD cd = new CD();
private Item item = new Item();
private List<Item> itemList = new ArrayList<Item>();

// ======================================
// =           Public Methods           =
// ======================================

public String doNewBook() {
    return "newBook.xhtml";
}

public String doNewCD() {
    return "newCD.xhtml";
}

public String doCreateBook() {
//  book.setDescription(item.getDescription());
//  book.setPrice(item.getPrice());
//  book.setTitle(item.getTitle());
    book = itemEJB.createBook(book);
    itemList = itemEJB.findItems();
    return "listItems.xhtml";
}

public String doCreateCD() {
//  cd.setDescription(item.getDescription());
//  cd.setPrice(item.getPrice());
//  cd.setTitle(item.getTitle());
    cd = itemEJB.createCD(cd);
    itemList = itemEJB.findItems();
    return "listItems.xhtml";
}

// ======================================
// =          Getters & Setters         =
// ======================================

public Book getBook() {
    return book;
}

public void setBook(Book book) {
    this.book = book;
}

public CD getCd() {
    return cd;
}

public void setCd(CD cd) {
    this.cd = cd;
}

public List<Item> getItemList() {
    itemList = itemEJB.findItems();
    return itemList;
}

public void setItemList(List<Item> itemList) {
    this.itemList = itemList;
}

public Item getItem() {
    return item;
}

public void setItem(Item item) {
    this.item = item;
}
}

ItemEJB.java 

package model;

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


@Stateless
public class ItemEJB {

// ======================================
// =             Attributes             =
// ======================================

@PersistenceContext(unitName = "Lab5PU")
private EntityManager em;

// ======================================
// =           Public Methods           =
// ======================================

public List<Item> findItems() {
    Query query = em.createNamedQuery("findAllItems");
    return query.getResultList();
}

public Book createBook(Book book) {
    em.persist(book);
    return book;
}

public CD createCD(CD cd) {
    em.persist(cd);
    return cd;
}
}

堆栈跟踪：
查看堆栈跟踪仅告诉我“ NamedQuery名称：找不到findAllItems”。 但在我的文件中看起来像这样“ @NamedQuery（name =“ findAllItems”，query =“ SELECT i FROM Item i”））。 如果您需要有关某事的更多信息，而不仅仅是告诉我并将其发布。

这是孔堆栈轨迹： 

javax.ejb.EJBException
javax.ejb.EJBException
    at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5193)
    at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5091)
    at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4879)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
    at $Proxy145.findItems(Unknown Source)
    at model.__EJB31_Generated__ItemEJB__Intf____Bean__.findItems(Unknown Source)
    at model.ItemController.getItemList(ItemController.java:83)
    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:601)
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:302)
    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.AstValue.getValue(AstValue.java:116)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:163)
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    at javax.faces.component.UIData.getValue(UIData.java:731)
    at javax.faces.component.UIData.getDataModel(UIData.java:1798)
    at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
    at javax.faces.component.UIData.setRowIndex(UIData.java:473)
    at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
    at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1754)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    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:722)
Caused by: java.lang.IllegalArgumentException: NamedQuery of name: findAllItems not found.
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getDatabaseQueryInternal(EJBQueryImpl.java:577)
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:1043)
    at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createNamedQuery(EntityManagerWrapper.java:533)
    at model.ItemEJB.findItems(ItemEJB.java:31)
    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:601)
    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:5366)
    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:601)
    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:5338)
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5326)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
    ... 58 more

================================================ ============================== 更新和解决方案我确实解决了问题，但我仍然不知道出了什么问题用它。 对于那些想知道这里解决方案的人。 我的PC上有三个硬盘。 我将所有文件从一个驱动器移到了另外两个驱动器。 然后将项目打印在纸上。 然后，我在Windows 7 x64上卸下了主驱动器，并格式化了空驱动器，安装了Windows 7（完整更新），netBeans，maven，glassFish和derby。 手工在netBeans中编写项目（无副本），制作一个新的PU，仅此而已。 只需运行该项目，一切现在都在工作，不了解它，但嘿，这就是生活=）

1 个解决方案

解决方案1
 1  2012-01-28 11:29:57

它把云搞砸了部署。 您应该尝试清理您的项目和服务器，然后重建并重新部署您的应用程序。 如果没有帮助，则您的代码或配置中有错误。

我使用带有字符串常量的命名查询声明。 它可以防止您在查询名称中输入错误。 

@Entity
@NamedQueries({
@NamedQuery(name=Item.QUERY_ALL, query="select i from Item i")})
public class Item implements Serializable {

  public static final String QUERY_ALL = "package.Item.all"

  // properties ...
}

进行这样的查询 

entityManager.createNamedQuery(Item.QUERY_ALL).getResultList();

我希望，这至少可以帮助您缩小问题范围。

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