我是一名学生，试图让我的家庭作业变成工作。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)并查看数据库中的项目。使用derby和glassfish，所有软件都是最新版本。
问题:
该项目无法在我的计算机上运行。我将漏洞项目发送给我的老师，以便他可以查看并尝试找出问题所在，他没有发现编码有任何问题，这意味着我的计算机有问题。所以我卸载了所有与java、netbeans、derby、maven和glassfish有关的东西，然后删除了该软件的文件夹并再次安装，同样的问题出现了。尝试了 ubuntu 和 virtualbox，同样的事情。
项目.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“名称的 NamedQuery:findAllItems 未找到”。但在我的文件中，它看起来像这样“@NamedQuery(name =“findAllItems”，query =“SELECT i FROM Item i”)”。如果您需要更多有关某事的信息，而不仅仅是告诉我并将发布它。
这是漏洞堆栈跟踪:
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 我确实解决了这个问题，但我仍然不知道出了什么问题。对于那些想知道解决方案的人来说，这里就来了。我的电脑上有三个硬盘。我将所有文件从一个驱动器移至另外两个驱动器。然后将项目打印在纸上。然后我删除了运行 Windows 7 x64 的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。在netBeans中手工写下该项目(没有副本)，制作一个新的PU，仅此而已。只需运行该项目，现在一切正常，不明白，但这就是生活 =)
最佳答案
它的云部署很困惑。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。如果它不能帮助您，则您的代码或配置有错误。
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 ...
}
像这样进行查询
entityManager.createNamedQuery(Item.QUERY_ALL).getResultList();
我希望，这至少能帮助您缩小问题范围。
关于Java EE 与 netbeans，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9044429/