Startup Problems / Configuring ZK and Hibernate / JPA

asked 2008-08-10 11:26:15 +0800

mh1
15

updated 2008-08-10 11:34:34 +0800

Hello,

I am a completely newbe to JAVA-Technologie, and i want to create a sample Application using ZK, Hibernate and MySQL database.

I setted up ZK in Eclipse and I got it to work with Tomcat Application Server. ZK Hello-World Applications are running into the Eclipse-Environment using Tomcat.

Then i integrated Hibernate. I designed the following Entity-Class for experimental:

----------------------------------------------------------------
package entities;

import javax.persistence.Entity;
import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {

public User() {
super();
}

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long id;
@Column(length=50,nullable=false)
private String name;
@Column(length=30,nullable=false)
private String email;
@Column(length=30,nullable=false)
private String password;

public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

}

-------------------------------------------------------------------------

To test this entity-Class i wrote a Test-Class that's working:

-------------------------------------------------------------------------

package entities.test;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;

import entities.User;

public class UserTest {

public static void main(String args[]) {

User myUser;
myUser = new User();
//myUser.setId(1);
myUser.setName("TEST");
myUser.setPassword("test123");
myUser.setEmail("[email protected]");

EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPA Hibernate");
EntityManager manager = emf.createEntityManager();
EntityTransaction tx = manager.getTransaction();
try {
tx.begin();

manager.persist(myUser);

tx.commit();
emf.close();
} catch(RuntimeException exc) {
try {
exc.printStackTrace();
tx.rollback();
} catch (RuntimeException exRb) {
System.out.println("Rollback nicht möglich");
}
throw exc;
}
finally {
manager.close();
}

}
}
-------------------------------------------------------------------------

Now i want to put ZK and Hibernate together. Therefore i wrote a "DAO-Class" to be called in ZK-Script:

-------------------------------------------------------------------------

package entities.dao;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;

import entities.User;

public class UserDaoImpl {

public UserDaoImpl() {
super();
// TODO Auto-generated constructor stub
}

public void test() {
User myUser;
myUser = new User();
//myUser.setId(1);
myUser.setName("TEST");
myUser.setPassword("test123");
myUser.setEmail("[email protected]");

EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPA Hibernate");
EntityManager manager = emf.createEntityManager();
EntityTransaction tx = manager.getTransaction();
try {
tx.begin();

manager.persist(myUser);

tx.commit();
emf.close();
} catch(RuntimeException exc) {
try {
exc.printStackTrace();
tx.rollback();
} catch (RuntimeException exRb) {
System.out.println("Rollback nicht möglich");
}
throw exc;
}
finally {
manager.close();
}

}
}

----------------------------------------------------------------------

To test this i wrote a simple ZUL-File userRegistration.zul:

----------------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?>
<p:zk xmlns:p="http://www.zkoss.org/2005/zul" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.zkoss.org/2005/zul http://www.zkoss.org/2005/zul/zul.xsd ">
<?variable-resolver class="org.zkoss.zkplus.jndi.JndiVariableResolver" ?>
<p:zscript>
userDaoLocalBean.test();
</p:zscript>
<p:window title="Benutzer registrieren" border="normal" width="500px" sizable="false">
<grid width="90%">
<rows>
<row>
Name: <textbox />
</row>
<row>
E-Mail: <textbox />
</row>
<row>
Password: <textbox />
</row>
<row>
<p:button label="Registrieren"></p:button>
</row>
</rows>
</grid>
</p:window>
</p:zk>
------------------------------------------------------------------------

According to http://www.zkoss.org/smalltalks/jndi/ i tried to register this class in web.xml. I added the following to inside the <web-app>-Tag:

--------------------------------------

<ejb-local-ref>
<ejb-ref-name>userDaoLocalBean</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home>entities.dao.UserDaoImpl</local-home>
<local>entities.dao.UserDaoImpl</local>
</ejb-local-ref>

-------------------------------------

I really didn't understand EJB at all, i in the ZUL-File
<?variable-resolver class="org.zkoss.zkplus.jndi.JndiVariableResolver" ?>
is not correct. Isn't it?

Is it, that i have to pass arg[0] and arg[1] correctly as described in http://www.zkoss.org/smalltalks/jndi/? But how?

This is, what i got, when i run this ZUL-Script on the Server:

-----

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.zkoss.zk.ui.UiException: Sourced file: inline evaluation of: ``userDaoLocalBean.test();'' : Attempt to resolve method: test() on undefined variable or class name: userDaoLocalBean : at Line: 1 : in file: inline evaluation of: ``userDaoLocalBean.test();'' : userDaoLocalBean .test ( )

sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
org.zkoss.lang.Classes.newInstance(Classes.java:78)
org.zkoss.lang.Exceptions.wrap(Exceptions.java:164)
org.zkoss.zk.ui.UiException$Aide.wrap(UiException.java:46)
org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:103)
org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:292)
org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:866)
org.zkoss.zk.ui.impl.UiEngineImpl.execNonComponent(UiEngineImpl.java:608)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:503)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:512)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:481)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:359)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:292)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:227)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:167)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

Sourced file: inline evaluation of: ``userDaoLocalBean.test();'' : Attempt to resolve method: test() on undefined variable or class name: userDaoLocalBean : at Line: 1 : in file: inline evaluation of: ``userDaoLocalBean.test();'' : userDaoLocalBean .test ( )

bsh.UtilEvalError.toEvalError(Unknown Source)
bsh.UtilEvalError.toEvalError(Unknown Source)
bsh.BSHMethodInvocation.eval(Unknown Source)
bsh.BSHPrimaryExpression.eval(Unknown Source)
bsh.BSHPrimaryExpression.eval(Unknown Source)
bsh.Interpreter.eval(Unknown Source)
bsh.Interpreter.eval(Unknown Source)
org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:100)
org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:292)
org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:866)
org.zkoss.zk.ui.impl.UiEngineImpl.execNonComponent(UiEngineImpl.java:608)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:503)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:512)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:481)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:359)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:292)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:227)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:167)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.

----

I hope me someone could help me getting started

Thanks and greetings.