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Re: [eclipselink-users] Q : getting started using EclipseLink ?
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Could you post your configuration of your EntityManagerFactory?
./tch
On Sun, Sep 7, 2008 at 8:27 PM, Penyihir Kecil <penyihirkecil@xxxxxxxxx> wrote:
> i tried this :
>
> Main.java
> ...
>
> public class Main {
> public static void main(String[] args){
> EntityManagerFactory emf =
>
> Persistence.createEntityManagerFactory("HelloJPA");
> EntityManager em = emf.createEntityManager();
> UserService service = new UserService(em);
>
> em.getTransaction().begin();
> User emp = service.createEmployee("aaa", "123", "admin");
> em.getTransaction().commit();
> }
> }
>
> =========================================================
>
> User.java
>
> ...
>
> @Entity
> @Table(name="USER", schema="database")
> public class User implements Serializable {
>
>
> @Id
> private String Username;
> private String Password;
> private String Status;
> private static final long serialVersionUID = 1L;
>
> public User() {
> super();
> }
> public String getUsername() {
> return this.Username;
> }
>
> public void setUsername(String Username) {
> this.Username = Username;
> }
> public String getPassword() {
> return this.Password;
> }
>
> public void setPassword(String Password) {
> this.Password = Password;
> }
> public String getStatus() {
> return this.Status;
> }
>
> public void setStatus(String Status) {
> this.Status = Status;
> }
>
> }
> =================================================
> UserService.java
>
> ....
>
> public class UserService {
> protected EntityManager em;
> public UserService(EntityManager em) {
> this.em = em;
> }
>
> public User createEmployee(String username, String password, String
> status) {
> User emp = new User();
> emp.setUsername(username);
> emp.setPassword(password);
> emp.setStatus(status);
> em.persist(emp);
> return emp;
> }
>
> public void removeUser(String username) {
> User emp = findUser(username);
> if (emp != null) {
> em.remove(emp);
> }
> }
>
> public User findUser(String username) {
> return em.find(User.class, username);
> }
>
> public Collection<User> findAllUsers() {
> Query query = em.createQuery("SELECT e FROM User e");
> return (Collection<User>) query.getResultList();
> }
> }
>
> ==========================================================
>
> Persistance.xml
>
> <?xml version="1.0" encoding="UTF-8"?>
> <persistence version="1.0" 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_1_0.xsd";>
> <persistence-unit name="HelloJPA" transaction-type="RESOURCE_LOCAL">
> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
> <class>
> edu.its.bean.User</class>
> <properties>
> <property name="eclipselink.jdbc.driver"
> value="org.gjt.mm.mysql.Driver"/>
> <property name="eclipselink.jdbc.url"
> value="jdbc:mysql://localhost:3306/database" />
> <property name="eclipselink.jdbc.user" value="root" />
> <property name="eclipselink.jdbc.password" value="" />
> <!-- EclipseLink should create the database schema automatically
> -->
> <property name="eclipselink.ddl-generation"
> value="drop-and-create-tables" />
> <property name="eclipselink.ddl-generation.output-mode"
> value="database" />
> <property name="eclipselink.jdbc.batch-writing" value="JDBC"/>
> <property name="eclipselink.jdbc.bind-parameters"
> value="false"/>
> </properties>
> </persistence-unit>
> </persistence>
>
> =================================================
>
> and i got an error :
> Exception in thread "main" java.lang.NullPointerException
> at java.util.Hashtable.put(Unknown Source)
> at java.util.Properties.setProperty(Unknown Source)
> at
> com.mysql.jdbc.NonRegisteringDriver.parseURL(NonRegisteringDriver.java:756)
> at
> com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:277)
> at java.sql.DriverManager.getConnection(Unknown Source)
> at java.sql.DriverManager.getConnection(Unknown Source)
> at
> org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:97)
> at
> org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:164)
> at
> org.eclipse.persistence.internal.databaseaccess.DatasourceAccessor.connectInternal(DatasourceAccessor.java:324)
> at
> org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.connectInternal(DatabaseAccessor.java:264)
> at
> org.eclipse.persistence.internal.databaseaccess.DatasourceAccessor.connect(DatasourceAccessor.java:407)
> at
> org.eclipse.persistence.sessions.server.ConnectionPool.buildConnection(ConnectionPool.java:130)
> at
> org.eclipse.persistence.sessions.server.ConnectionPool.startUp(ConnectionPool.java:367)
> at
> org.eclipse.persistence.sessions.server.ServerSession.connect(ServerSession.java:500)
> at
> org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.login(DatabaseSessionImpl.java:606)
> at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:211)
> at
> org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:246)
> at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:69)
> at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:118)
> at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:112)
> at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:100)
>
>
> is there something wrong with my code ??
>
>
> thnx u
>
>
> dwi ardi irawan - 'penyihirkecil'
> http://dwiardiirawan.blogspot.com
>
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