java.lang.NullPointerException at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus

Question

JAX-RS kaynağımda DBOberationImpl EJB'yi enjekte edebilirim. Fakat DBOperationImpl fasulyesinde JPA EntityManager'ı kullanamıyorum. Bu nasıl oldu ve nasıl çözebilirim?

Proje yapısı:

EJB arayüzü:

package jpahibernate.service; 

import entity.BookmatePromoCode; 
import java.util.List; 
import javax.ejb.Local; 

@Local 
public interface DBOperationInterface { 

    public List<BookmatePromoCode> bookmatePromoCodes(); 

} 

EJB uygulaması:

package jpahibernate.impl; 

import entity.BookmatePromoCode; 
import java.util.ArrayList; 
import java.util.List; 
import javax.ejb.LocalBean; 
import javax.ejb.Stateless; 
import javax.persistence.EntityManager; 
import javax.persistence.PersistenceContext; 
import javax.persistence.Query; 
import jpahibernate.service.DBOperationInterface; 

@Stateless 
@LocalBean 
public class DBOperationImpl implements DBOperationInterface { 

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

    @Override 
    public List<BookmatePromoCode> bookmatePromoCodes() { 
     System.out.println("mesaj bookmatePromoCodes"); 
     System.out.println(em); 
     Query query = em.createQuery("select b from BookmatePromoCode b"); 
     List result = query.getResultList(); 
     System.out.println(result); 
     return new ArrayList<BookmatePromoCode>(); 
    } 
} 

JAX-RS kaynak:

package restfulservices; 

import dto.BookmatePromoCodeDTO; 
import dto.CustomObjectDTO; 
import dto.ErrorDTO; 
import dto.ResponseDTO; 
import entity.BookmatePromoCode; 
import java.util.ArrayList; 
import java.util.List; 
import javax.ejb.EJB; 
import javax.ejb.Stateless; 
import javax.ws.rs.*; 
import javax.ws.rs.core.MediaType; 
import javax.ws.rs.core.Response; 
import jpahibernate.service.DBOperationInterface; 
@Stateless 
@Path("/bookmates") 
public class BookmateRestfulService { 

@EJB 
private DBOperationInterface dbOperation; 

@GET 
@Produces(MediaType.APPLICATION_JSON) 
@Consumes("application/json") 
public Response bookmates() { 

    ResponseDTO resp = new ResponseDTO(); 
    try { 
     List<BookmatePromoCode> bookmatePromoCodes = dbOperation.bookmatePromoCodes(); 
     ArrayList<BookmatePromoCodeDTO> bookmatePromoCodeDTOs = new ArrayList<BookmatePromoCodeDTO>(); 
     for (BookmatePromoCode bpc : bookmatePromoCodes) { 
      //data transfer object 
      BookmatePromoCodeDTO bpcDTO = new BookmatePromoCodeDTO(); 
      bpcDTO.setKod(bpc.getCode()); 
      bookmatePromoCodeDTOs.add(bpcDTO); 
     } 
     resp.setObject(new CustomObjectDTO(bookmatePromoCodeDTOs)); 
    } catch (Exception ex) { 
      ex.printStackTrace(); 
      resp.setError(new ErrorDTO(1, "select zamani xeta bash verdi")); 
      return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(resp).build(); 
    } 
     return Response.ok(resp).build(); 
    } 
} 

persistence.xml

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence 
         http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"> 
    <persistence-unit name="mypdu" transaction-type="JTA"> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 
     <class>entity.BookmatePromoCode</class> 
     <exclude-unlisted-classes>false</exclude-unlisted-classes> 
     <shared-cache-mode>NONE</shared-cache-mode> 
     <properties> 
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/bookmate?characterEncoding=UTF-8&amp;characterSetResults=UTF-8"/> 
      <property name="javax.persistence.jdbc.user" value="root"/> 
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/> 
      <property name="javax.persistence.jdbc.password" value="12345"/> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/> 
     </properties> 
    </persistence-unit> 
</persistence> 

Ben EntityManager enjekte edilemez. Sadece NullPointerException alıyorum.

Warning: Exception while dispatching an event 
java.lang.NullPointerException 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:76) 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:118) 
    at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1602) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:210) 
    at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:91) 
    at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:345) 
    at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:313) 
    at org.glassfish.persistence.jpa.JPADeployer$2.visitPUD(JPADeployer.java:451) 
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510) 
    at org.glassfish.persistence.jpa.JPADeployer.iterateInitializedPUsAtApplicationPrepare(JPADeployer.java:492) 
    at org.glassfish.persistence.jpa.JPADeployer.event(JPADeployer.java:398) 
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131) 
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:487) 
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219) 
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:539) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:535) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at javax.security.auth.Subject.doAs(Subject.java:360) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:534) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:565) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:557) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at javax.security.auth.Subject.doAs(Subject.java:360) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:556) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1464) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1300(CommandRunnerImpl.java:109) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846) 
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722) 
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534) 
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224) 
    at org.glassfish.grizzly.http.server.StaticHttpHandlerBase.service(StaticHttpHandlerBase.java:189) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper$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:201) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175) 
    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:284) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561) 
    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$Worker.doWork(AbstractThreadPool.java:565) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545) 
    at java.lang.Thread.run(Thread.java:745) 

Answer 1

Sen persistence.xml içine bu eklemek gerekir (dayanıklılık birim etiketine): Ben hata altına almak uygulamayı dağıtırken O vb unitName bulamadık

<jta-data-source>java:/yourDataSource</jta-data-source>