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persist() does not write to database

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Mashx1

Post subject: persist() does not write to database

Posted: Thu Sep 27, 2012 8:24 pm

Newbie

Joined: Thu Sep 27, 2012 8:06 pm
Posts: 2

Hi everyone,

Actually I try to use GWT, Request Factory + JPA with Hibernate.
It seems to be working, but there is no data in my local database.

I can create a EntityMangerFactory

Code:

private static final EntityManagerFactory emfInstance = Persistence.createEntityManagerFactory("kunde");

a EntityManger

Code:

EMF.createEntityManager();

and persists a Object

Code:

em.persist(Worker);

I can also read all my persisted Objects.

But I dont know where the data is saved. I thought, it should be saved in the postgresDB I configured in my persistence.xml?

Im new to hibernate, so hopefully anyone of you can help me with that.

Any help is much appreciated.
Thanks in advanced.

Regards,
Manuel

Here is my Code, please let me know if you need any further information.

My Entity Class

Code:

package de.mash.project.server;

import java.util.List;

import javax.jdo.annotations.Transactional;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Transient;

@Entity
@Table(name = "Worker")
public class Worker {

   public static Worker findWorker(Long id) {
      // if (id == 0) {
      return null;
      // }
      // EntityManager em = entityManager();
      // try {
      // Worker worker = em.find(Worker.class, id);
      // return worker;
      // } finally {
      // em.close();
      // }
   }

   @Transient
   protected Object[] jdoDetachedState;

   // @Id
   // @GeneratedValue(generator = "auto_increment")
   // @GenericGenerator(name = "auto_increment", strategy = "increment")
   // @Column(name = "id")
   // private int id;

   @Id
   @Column(name = "id")
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long id;

   @Column(name = "first_name")
   private String firstName;

   @Column(name = "last_name")
   private String lastName;

   @Column(name = "salary")
   private int salary;

   public Worker() {
   }

   public Worker(String fname, String lname, int salary) {
      this.firstName = fname;
      this.lastName = lname;
      this.salary = salary;
   }

   public Long getId() {
      return id;
   }

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

   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String first_name) {
      this.firstName = first_name;
   }

   public String getLastName() {
      return lastName;
   }

   public void setLastName(String last_name) {
      this.lastName = last_name;
   }

   public int getSalary() {
      return salary;
   }

   public void setSalary(int salary) {
      this.salary = salary;
   }

   public static Long countWorkers() {
      return 2l;
   }

   public Integer getVersion() {
      return 1;
   }

   public void persist() {
      EntityManager em = entityManager();
      try {
         // em.getTransaction().begin();
         em.persist(this);
         // em.flush();
         // em.getTransaction().commit();
      } catch (Exception e) {
         int i = 1;
      } finally {
         em.close();
      }

      em = entityManager();

      final List<Worker> list = em.createQuery("select p from Worker p").getResultList();

      System.out.println(list.size());
      for (Worker current : list) {
         System.out.println(current.getFirstName() + " " + current.getLastName() + " " + current.getSalary());
      }

      em.close();

   }

   public static final EntityManager entityManager() {
      return EMF.get().createEntityManager();
   }

}

My persistence.xml

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<persistence 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_1_0.xsd" version="1.0">
   
    <persistence-unit name="kunde" transaction-type="RESOURCE_LOCAL">
        <class>de.mash.project.server.Worker</class>

        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.show_sql" value="true" />
           
            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/dev_mash" />
            <property name="hibernate.connection.username" value="postgres" />
            <property name="hibernate.connection.password" value="m4nu3l" />
            <property name="hibernate.default_schema" value="public" />
           
            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
        </properties>
    </persistence-unit>
    
</persistence>

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Mashx1

Post subject: Re: persist() does not write to database

Posted: Fri Sep 28, 2012 2:41 am

Newbie

Joined: Thu Sep 27, 2012 8:06 pm
Posts: 2

andrewmicky wrote:

thanks for sharing coding

No problem :)

But I still could need some help to understand how to configurate this.

As I mentioned above, I can persist Objects and they get stored, somewhere...
I dont know where, but they dont appear in my local postgres db.

So actually I got no clue where the objects get stored, I just know they get stored.

I regocnized that I dont got a provider in my xml... Do I need one?
So I added

Code:

<provider>org.hibernate.ejb.HibernatePersistence</provider>

to my persistence.xml, that causes an exception because the EntityManagerFactory cant be created anymore.

Any help is much appreciated.
Regards

Heres what I get:
com.google.web.bindery.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$StandardPayloadDialect.processPayload(AbstractRequestContext.java:387)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$5.onTransportSuccess(AbstractRequestContext.java:1108)
at com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport$1.onResponseReceived(DefaultRequestTransport.java:136)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Server Error: null
at com.google.web.bindery.requestfactory.shared.Receiver.onFailure(Receiver.java:44)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequest.onFail(AbstractRequest.java:118)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$StandardPayloadDialect.processPayload(AbstractRequestContext.java:359)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$5.onTransportSuccess(AbstractRequestContext.java:1108)
at com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport$1.onResponseReceived(DefaultRequestTransport.java:136)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)

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