또 다른 'EntityManager is null'질문입니다. 나는 대답을 찾았지만 나를 위해 일하는 것을 찾지 못했습니다. 큰 프로젝트를 맡고 있고 디버깅 할 때 빨간 청어를 잘라내려고 단순화하려고합니다. 나는 단순한 고객/주문 시스템에 종사하고 있으며 나는 단지 그것을 배치하고 고객 목록을 보려고한다. 또 다른 질문을 바탕으로 내가 물었다과 resulting suggestion 나는 다음 (하단에 실제 질문 스택 추적) 아래로 해요 :EntityManager NullPointerException
의 persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="my_PU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>my_datasource</jta-data-source>
<class>my.database.model.Customer</class>
<class>my.database.model.Order</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
</persistence-unit>
</persistence>
web.xml을
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>MyWebApp</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<context-param>
<description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
<context-param>
<param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
<param-value>resources.application</param-value>
</context-param>
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/balusc.taglib.xml</param-value>
</context-param>
<context-param>
<param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
<param-value>true</param-value>
</context-param>
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<context-param>
<param-name>javax.faces.PARTIAL_STATE_SAVING</param-name>
<param-value>false</param-value>
</context-param>
<listener>
<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>
</web-app>
웹 페이지 - menu.xhtml
<html
xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<head>
<link rel="stylesheet" type="text/css" media="screen,projection"
href="../css/menu.css" /></head>
<ui:component>
<div class="menu-container">
<div class="menu-tab">
<ul>
<li><a href="index.xhtml"><span>Home</span></a></li>
<li><h:outputLink
value="#{customerController.getUrl()}">
<span><h:outputText value="Customer" /></span>
</h:outputLink></li>
<li><a href=""><span>Logout</span></a></li>
</ul>
</div>
</div>
</ui:component>
</html>
고객 담당자 웹.
package my.webapp.web.controller;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.enterprise.context.RequestScoped;
import javax.inject.Named;
import my.model.Customer;
@Named(value = "customerController")
@RequestScoped
public class CustomerController// extends FormRequestController
{
private Customer customer;
private String id;
protected List<?> entityObjectList;
protected boolean editMode;
@PostConstruct
public void init() {
System.out.println("CustomerController init");
setEntityObjectList(findAll());
}
public List<?> findAll() {
List<Customer> dataList = Customer.getAllRecords();
return dataList;
}
public String getUrl()
{
System.out.println("CustomerController getUrl");
return "www.google.com";
}
//getters and setters ommitted for brevity
}
Customer.java
package my.model;
import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.ejb.EJB;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import my.database.manager.PersistenceStoreManager;
@Entity
@Table(name=Customer.TBL_NAME)
@NamedQueries({
@NamedQuery(name=Customer.QRY_ALL, query="select object(a) from Customer a")
})
public class Customer implements Serializable {
private static final long serialVersionUID = 1L;
/**
* Manager class to manager DB connections
*/
@EJB
private static PersistenceStoreManager<Customer> psm;
// Table constants
public static final String TBL_NAME = "Customer";
public static final String QRY_ALL = TBL_NAME + ".all";
private int id;
private String name;
private Set<Order> orders;
public Customer() {
}
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
public int getId() {
return this.id;
}
//bi-directional many-to-one association to Order
@OneToMany(mappedBy="id")
public Set<Order> getOrders() {
return this.orders;
}
public void setOrders(Set<Order> orders) {
this.orders = orders;
}
public static List<Customer> getAllRecords(){
Map<String, Object> params = new HashMap<String, Object>();
return psm.getResultSetList(QRY_ALL, params);
}
//other getters and setters omitted for brevity
}
PersistenceStoreManager.java
package my.database.manager;
import java.util.List;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
/**
* This class is responsible for performing CRUD operations using the
* EntityManager of the PersistenceContext.
*
*
*/
@Stateless
public class PersistenceStoreManager<T>
{
@PersistenceContext(unitName = "my_PU")
private EntityManager em;
public PersistenceStoreManager()
{
System.out.println("PersistenceStoreManager loaded");
System.out.println("em is null: "+(em==null));
}
@PostConstruct
public void postInject()
{
System.out.println("postInject");
System.out.println("em is null: "+(em==null));
}
/**
* @param namedQuery
* @param criteria
* @return
*/
public List<T> getResultSetList(String namedQuery,
Map<String, Object> criteria) {
Query q = em.createNamedQuery(namedQuery);
for (Map.Entry<String, Object> entry : criteria.entrySet()) {
q.setParameter(entry.getKey(), entry.getValue());
}
List<T> resultSetList = q.getResultList();
return resultSetList;
}
}
내 응용 프로그램 전개함에하지만 menu.xhtml 페이지를 표시 할 때 나는 유비쿼터스 NullPointerException를 얻을. 의 I 내 응용 프로그램을 배포 할 때 기록됩니다
다음 로깅 index.xhtml/8080/MyWebApp로-0.0.1-SNAPSHOT/얼굴 :-warning을 | org.apache.catalina.connector.Request | _ThreadID = 37; _ThreadName = 스레드 2; | PWC4011 : UTF에 요청 문자 인코딩을 설정할 수 없습니다 -8 요청 매개 변수가 이미 읽혀 지거나 ServletRequest.getReader()가 이미 호출 되었기 때문에 | #]
-INFO | uploadFileName = MyWebApp-0.0.1-SNAPSHOT.war | #]
-INFO | javax.enterprise.system.container.ejb.com.sun.ejb.containers | EJB PersistenceStoreManager의 이식 가능한 JNDI 이름 : [java : global/MyWebApp-0.0.1-SNAPSHOT/PersistenceStoreManager, java : global/MyWebApp-0.0.1- SNAPSHOT/PersistenceStoreManager! my.database.manager.PersistenceStoreManager] | #]
-INFO | javax.enterprise.system.std.com.sun.enterprise.server.logging | PersistenceStoreManager로드 됨 | #]
-INFO | javax.enterprise.system.std.com.sun.enterprise.server.logging | em가 null 인 경우 true : | #]
-INFO | javax.enterprise.resource.webcontainer.jsf.config | 컨텍스트 '/MyWebApp-0.0.1-SNAPSHOT'|#에 대한 Mojarra 2.1.6 (SNAPSHOT 20111206) 초기화 중 ]
-INFO | org.primefaces.webapp.PostConstructApplicationEventListener | PrimeFaces 3.4.1에서 실행 | #]
-INFO | javax.enterprise.system.container.web.com.sun.enterprise.web | WEB0671 : 응용 프로그램로드 중 [/MyWebApp-0.0.1-SNAPSH 6243 OT]의 [MyWebApp-0.0.1-SNAPSHOT] | #]
-INFO | javax.enterprise.system.tools.admin.org.glassfish.deployment.admin | MyWebApp- 0.0.1-SNAPSHOT은 1,598 밀리 초 안에 성공적으로 배포되었습니다. | #]
내가 myserver로로 이동하면
[# | 2014-06-06T16 : 51 : 0100 + 56.988 | 심각 | glassfish3.1.2 | javax.enterprise.resource.오류 렌더링보기 [/index.xhtml]
javax.el.ELException : /templates/menu.xhtml @ 15,64 value = "# {customerController .getUrl()} ": org.jboss.weld.exceptions.WeldException : WELD-000049 [메소드]를 호출 할 수 없습니다. @PostConstruct public my.webapp.web.controller.CustomerController.init() on my.webapp.web.controller .CustomerController @ javax.faces.component.ComponentStateHelper.eval에서 com.sun.faces.facelets.el.TagValueExpression.getValue (TagValueExpression.java:114)에서
(ComponentStateHelper.java:194) 4085f7ff
.. . [long stack trace] ...
에 의해 발생 : java.lang.NullPointerException
a t my.model.Customer.getAllRecords (Customer.java:64)
at my.webapp.web.controller.CustomerController.findAll (CustomerController.java:41)
at my.webapp.web.controller.CustomerController.init (CustomerController.java:37) sun.reflect.NativeMethodAccessorImpl.invoke0 (원시 메소드) sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:39)
에서
에서
... [긴 스택 트레이스] .. .Customer에서postInject()방법에 로깅
없음, CustomerControllerPersistenceStoreManager이 출력되고 있습니다. 그들은 @PostConstruct으로 주석을 달았고 주입 후에 호출되어야하기 때문에 EJB 주입이 일어나지 않는다고 가정합니다.
EJB 주입이 일어나지 않는 이유는 누구나 볼 수 있습니까?
감사합니다.이 문제는 근본적인 문제의 결과였습니다. 엔티티가 자체적 인 영속성을 갖도록하기 위해 노력하고있었습니다. 그 작업은 콘테이너로 관리 될 컨트롤러에 실제로 지정되어야합니다. 나는'psm' 객체와 그것을'CustomerController' 클래스에 사용하는 메소드를 옮기고 비 정적으로 변경했습니다 (당신이 참조한 스펙에 나와 있습니다). – user3337410