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Я не могу решить эту проблему. Я пробовал поиск по Google, но не могу собрать их вместе. У меня есть следующие трассировки стека:NullPointerException происходит с createNamedQuery, а затем успешно сохраняется логический элемент с сохранением.
Warning: java.lang.NullPointerException
at org.eclipse.persistence.platform.server.ServerPlatformUtils.createServerPlatform(ServerPlatformUtils.java:99)
at org.eclipse.persistence.sessions.factories.SessionManager.init(SessionManager.java:77)
at org.eclipse.persistence.sessions.factories.SessionManager.<clinit>(SessionManager.java:71)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.addSessionToGlobalSessionManager(EntityManagerSetupImpl.java:907)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.initSession(EntityManagerSetupImpl.java:2671)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:675)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:318)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:197)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createNamedQuery(EntityManagerWrapper.java:521)
at session.CategoryFacade.findRandom(CategoryFacade.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:64)
at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at com.sun.proxy.$Proxy173.findRandom(Unknown Source)
at session.__EJB31_Generated__CategoryFacade__Intf____Bean__.findRandom(Unknown Source)
at actions.ActionFacade.setFeaturedCategories(ActionFacade.java:82)
at actions.HomeAction.execute(HomeAction.java:16)
at controller.ControllerServlet.service(ControllerServlet.java:65)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
at java.lang.Thread.run(Thread.java:745)
Info: EclipseLink, version: Eclipse Persistence Services - 2.6.1.v20150605-31e8258
Info: /file:/Users/csexton/NetBeansProjects/ReadersParadise/build/web/WEB-INF/classes/_AffableBeanPU login successful
Так что, если вы посмотрите на двух последних строках мой упорный блок не лесозаготовительных, пока я не пытаюсь использовать диспетчер сущностей. Если я сделаю еще один запрос после первого, все будет хорошо, никаких ошибок, ничего ... Ошибка возникает в createNamedQuery. Запрос существует и совпадает с точным именем. Я могу вызвать тот же метод дважды, и первый из них вызывает NPE, но второй работает нормально.
@Stateless(name="CategoryFacade")
public class CategoryFacade extends AbstractFacade<Category> {
@PersistenceContext(unitName = "AffableBeanPU")
private EntityManager em;
@Override
protected EntityManager getEntityManager() {
return em;
}
public CategoryFacade() {
super(Category.class);
}
public List<Category> findRandom(int limit) {
return getEntityManager()
.createNamedQuery("Category.findRandomByLimit")
.setParameter(1, limit)
.getResultList();
}
}
Я делаю JNDI поиск для класса
public class ActionFacade implements AutoCloseable {
private static ThreadLocal<ActionFacade> instance = new ThreadLocal<>();
private HttpServletRequest request;
private HttpSession session;
private CategoryFacade categoryFacade;
private BookFacade bookFacade;
private OrderManager orderManager;
private ShoppingCart cart;
public ActionFacade(HttpServletRequest request) {
this.request = request;
this.session = request.getSession();
try {
Context ctx = new InitialContext();
this.categoryFacade = (CategoryFacade) ctx.lookup(
"java:global/ReadersParadise/CategoryFacade!session.CategoryFacade");
System.out.print("JNDI lookup complete.");
this.bookFacade = (BookFacade) ctx.lookup(
"java:global/ReadersParadise/BookFacade!session.BookFacade");
this.orderManager = (OrderManager) ctx.lookup(
"java:global/ReadersParadise/OrderManager!session.OrderManager");
} catch (NamingException ex) {
System.err.println(ex);
}
}
public static ActionFacade create(HttpServletRequest request) {
ActionFacade facade = new ActionFacade(request);
instance.set(facade);
return facade;
}
public static ActionFacade getCurrentInstance() {
return instance.get();
}
@Override
public void close() {
instance.remove();
}
public void setSelectedCategory() {
String categoryName = request.getParameter("category");
Category selectedCategory = categoryFacade.findByName(categoryName);
if (selectedCategory == null) {
selectedCategory = categoryFacade.find(1);
}
session.setAttribute("selectedCategory", selectedCategory);
Collection<Book> categoryBooks = selectedCategory.getBookCollection();
session.setAttribute("categoryBooks", categoryBooks);
}
public void setAllCategories() {
request.setAttribute("categories", categoryFacade.findAll());
}
}
Тогда в моем сервлета я использую ActionFacade как это ....
try(ActionFacade facade = ActionFacade.create(request)) {
Action action = ActionFactory.getAction(request);
String view = action.execute(facade);
System.out.println(request.getServletPath());
if (request.getServletPath().equals("") || view.equals(request.getServletPath().substring(1))) {
request.getRequestDispatcher("/WEB-INF/views/" + view + ".jsp").forward(request, response);
} else {
response.sendRedirect(view);
}
} catch (NullPointerException e) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
} catch (Exception e) {
throw new ServletException("Executing action failed.", e);
}
Это категория объект
@Entity
@Table(name = "category")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Category.findAll", query = "SELECT c FROM Category c"),
@NamedQuery(name = "Category.findById", query = "SELECT c FROM Category c WHERE c.id = :id"),
@NamedQuery(name = "Category.findByName", query = "SELECT c FROM Category c WHERE c.name= :name")
})
@NamedNativeQuery(name = "Category.findRandomByLimit",
query = "SELECT * FROM Category ORDER BY RAND() LIMIT ?1")
public class Category implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 45)
@Column(name = "name")
private String name;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "category")
private Collection<Book> bookCollection;
public Category() {
}
public Category(Integer id) {
this.id = id;
}
public Category(Integer id, String name) {
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlTransient
public Collection<Book> getBookCollection() {
return bookCollection;
}
public void setBookCollection(Collection<Book> bookCollection) {
this.bookCollection = bookCollection;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Category)) {
return false;
}
Category other = (Category) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entity.Category[ id=" + id + " ]";
}
}
Категория Закон иона класса, который использует ActionFacade
public class CategoryAction implements Action {
@Override
public String execute(ActionFacade facade) throws Exception {
facade.setSelectedCategory();
facade.setAllCategories();
return "category";
}
}
Это просто предупреждение, а не исключение или ошибка ... (конечно, это все еще некрасиво) – badera
что вызывает его? – Grim
Я бы посоветовал не смешивать Контейнерную управляемую фазу с использованием аннотации CDI/EJB с поиском JNDI. – AsSiDe