Hey Kevin,
Persistence.xml is in the META-INF directory.... and think is package with
the other Entities.... I have made this in eclipse so the IDE puts all
entities in the source folder and the jsp in the WebContent folder.... i
think all have been packaged correctly....is there anyway i can check that?
Kevin Sutter wrote:
>
> So, it looks like an NPE is happening when attempting to use the emf (at
> line 21):
>
>> 20: emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
>> 21: em = emf.createEntityManager();
>
> This would indicate that the createEntityManagerFactory is returning null,
> which probably indicates that the Persistence processing couldn't find the
> persistence.xml file. Is your persistence.xml file in your META-INF
> directory and properly packaged with your JSP and other Entities?
>
> Kevin
>
> On Fri, Aug 1, 2008 at 6:35 AM, Anish <[EMAIL PROTECTED]> wrote:
>
>>
>> Hey i have just been trying to get openjpa and jsp to work.... and i seem
>> to
>> get some errors.... iam using eclipse for this and running it on tomcat
>> 6.0
>>
>> Greeeting.java
>> package foo;
>>
>> import java.io.Serializable;
>> import javax.persistence.Basic;
>> import javax.persistence.Entity;
>> import javax.persistence.GeneratedValue;
>> import javax.persistence.Id;
>>
>> @Entity
>> public class Greeting implements Serializable {
>> @Id @GeneratedValue private int id;
>> @Basic private String message;
>> @Basic private String language;
>>
>> public Greeting() {}
>> public Greeting(String message, String language) {
>> this.message = message;
>> this.language = language;
>> }
>>
>> public String toString() {
>> return "Greeting id=" + id + ", message=" + message + ",
>> language=" +
>> language;
>> }
>> }
>>
>>
>> HelloWorld.java
>> package foo;
>> import javax.persistence.EntityManager;
>> import javax.persistence.EntityManagerFactory;
>> import javax.persistence.Persistence;
>>
>>
>>
>> persistence.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="projectjpa">
>> <class>foo.Greeting</class>
>> <properties>
>> <!--
>> We can configure the default OpenJPA properties here. They
>> happen to be commented out here since the provided
>> examples
>> all specify the values via System properties.
>> -->
>>
>>
>> <property name="openjpa.ConnectionURL"
>> value="jdbc:mysql://localhost:3306/greeting"/>
>> <property name="openjpa.ConnectionDriverName"
>> value="com.mysql.jdbc.Driver"/>
>> <property name="openjpa.ConnectionUserName"
>> value="root"/>
>> <property name="openjpa.ConnectionPassword"
>> value="admin"/>
>> <property name="openjpa.jdbc.SynchronizeMappings"
>> value="buildSchema(SchemaAction='dropDB,add')"/>
>> </properties>
>> </persistence-unit>
>> </persistence>
>>
>> open.jsp
>> <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
>> pageEncoding="ISO-8859-1"%>
>> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
>> "http://www.w3.org/TR/html4/loose.dtd";>
>> <[EMAIL PROTECTED] import="javax.persistence.EntityManager"%>
>> <[EMAIL PROTECTED] import="javax.persistence.EntityManagerFactory"%>
>> <%@ page import="data.Greeting" %>
>> <[EMAIL PROTECTED] import="javax.persistence.Persistence"%>
>> <html>
>> <head>
>> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
>> <title>Insert title here</title>
>> </head>
>> <body>
>> <%
>> final EntityManagerFactory emf;
>> final EntityManager em;
>> final String PERSISTENCE_UNIT_NAME = "projectjpa";
>>
>>
>> emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
>> em = emf.createEntityManager();
>> ////////////////////////
>>
>> em.getTransaction().begin();
>> Greeting g_en = new Greeting("hello world", "en");
>> Greeting g_es = new Greeting("hola, mundo", "es");
>> Greeting[] greetings = new Greeting[]{g_en, g_es};
>> for(Greeting g : greetings) {
>> em.persist(g);
>> }
>> em.getTransaction().commit();
>> ///////////////////
>>
>> Greeting g = (Greeting) em.createQuery(
>
>> "select g from Greeting g where g.language = :language")
>> .setParameter("language", "en").getSingleResult();
>> out.println("Query returned: " + g);
>> ////////////////////////////////////
>> em.close();
>> emf.close();
>>
>> %>
>>
>> </body>
>> </html>
>>
>> Errors...
>> org.apache.jasper.JasperException: An exception occurred processing JSP
>> page
>> /open.jsp at line 21
>>
>> 18:
>> 19:
>> 20: emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
>> 21: em = emf.createEntityManager();
>> 22: ////////////////////////
>> 23:
>> 24: em.getTransaction().begin();
>>
>>
>> Stacktrace:
>>
>>
>> org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
>>
>>
>> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
>>
>> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
>> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>>
>>
>> org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
>>
>> root cause
>>
>> java.lang.NullPointerException
>> org.apache.jsp.open_jsp._jspService(open_jsp.java:76)
>> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>>
>>
>> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
>>
>> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
>> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>>
>>
>> org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
>>
>> note The full stack trace of the root cause is available in the Apache
>> Tomcat/6.0.16 logs.
>> --
>> View this message in context:
>> http://n2.nabble.com/using-jsp-and-openjpa....-tp664117p664117.html
>> Sent from the OpenJPA Users mailing list archive at Nabble.com.
>>
>>
>
>
--
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