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HTCPrasad
 Post subject: using JPA in servlets
PostPosted: Sat Apr 11, 2009 2:30 am 
Newbie

Joined: Sat Apr 04, 2009 11:39 pm
Posts: 1
Location: Chennai,Tamilnadu,India
i am working with hibernate 3.3.1,jdk1.6.0, jboss5.0.0GA.


I have written persistence .xml in
%CONTEXT_ROOT%\WEB-INF\classes\META-INF like

<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/ ... ce_1_0.xsd"
version="1.0">

<persistence-unit name="simple" transaction-type="RESOURCE_LOCAL">

<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/XAOracleDS</jta-data-source>

<properties>

<property name="hibernate.archive.autodetection"
value="class,hbm" />

<property name="hibernate.show_sql"
value="true" />

<property name="hibernate.format_sql"
value="true" />


<property name="hibernate.c3p0.min_size"
value="2" />

<property name="hibernate.c3p0.max_size"
value="5" />

<property name="hibernate.c3p0.timeout"
value="300" />

<property name="hibernate.c3p0.max_statements"
value="15" />

<property name="hibernate.c3p0.idle_test_period"
value="300" />

<property name="hibernate.dialect"
value="org.hibernate.dialect.Oracle9Dialect" />

</properties>
</persistence-unit>

</persistence>
then wrote a servlet like
package myjpas;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceUnit;
import javax.annotation.Resource;
import javax.persistence.PersistenceContextType;
import javax.naming.InitialContext;
import javax.transaction.UserTransaction;

@PersistenceContext(name="java:/myJPA",
unitName="simple")
public class JPASafeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Resource(name="java:/myJPA")
EntityManager em;

public void init(){
System.out.println("bbbbbb");
}

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

try {
String id = request.getParameter("userId");
long userId = 0L;
int age = 0;

if(id!=null || !(id.isEmpty())) {
userId = Long.parseLong(id);
}

String uname = request.getParameter("username");
String email = request.getParameter("email");
String ageStr = request.getParameter("age");

if(ageStr!=null || !(ageStr.isEmpty())) {
age = Integer.parseInt(ageStr);
}
response.setContentType("text/html");
PrintWriter out = response.getWriter();

EntityTransaction trans = em.getTransaction();
UserTO user = new UserTO(userId,uname,email,age);
if(em !=null) {
System.out.println("..."+em.isOpen());
trans.begin();
em.persist(user);
trans.commit();
out.println("User saved");
}
else {
out.println("User not saved");
}
em.close();

}
catch(Exception e) {
e.printStackTrace();
}
}

}
but when i am running , iam getting Nullpointer exception on server console
(HDScanner) Fully Deployed vfszip:/C:/jboss500/server/standard/deploy/jpaweb.war
2009-04-11 11:43:17,442 INFO [STDOUT] (http-127.0.0.1-10080-1) bbbbbb
2009-04-11 11:43:17,455 ERROR [STDERR] (http-127.0.0.1-10080-1)

java.lang.NullPointerException
2009-04-11 11:43:17,455 ERROR [STDERR] (http-127.0.0.1-10080-1) at

myjpas.JPASafeServlet.doPost(Unknown Source)
2009-04-11 11:43:17,455 ERROR [STDERR] (http-127.0.0.1-10080-1) at

javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
2009-04-11 11:43:17,456 ERROR [STDERR] (http-127.0.0.1-10080-1) at

javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
2009-04-11 11:43:17,456 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:290)
2009-04-11 11:43:17,456 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.ApplicationFilterChain.doFilter

(ApplicationFilterChain.java:206)
2009-04-11 11:43:17,456 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
2009-04-11 11:43:17,457 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.ApplicationFilterChain.internalDoFilter

(ApplicationFilterChain.java:235)
2009-04-11 11:43:17,457 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.ApplicationFilterChain.doFilter

(ApplicationFilterChain.java:206)
2009-04-11 11:43:17,457 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
2009-04-11 11:43:17,457 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
2009-04-11 11:43:17,457 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.jboss.web.tomcat.security.SecurityAssociationValve.invoke

(SecurityAssociationValve.java:190)
2009-04-11 11:43:17,457 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
2009-04-11 11:43:17,458 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process

(SecurityContextEstablishmentValve.java:126)
2009-04-11 11:43:17,460 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke

(SecurityContextEstablishmentValve.java:70)
2009-04-11 11:43:17,460 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
2009-04-11 11:43:17,460 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke

(CachedConnectionValve.java:158)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process

(Http11Protocol.java:601)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
2009-04-11 11:43:17,461 ERROR [STDERR] (http-127.0.0.1-10080-1) at

java.lang.Thread.run(Thread.java:619)

if any body find a way ,please let me know.

thanks in advance

_________________
dtrprasad

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sanne.grinovero
 Post subject:
PostPosted: Mon Apr 13, 2009 5:59 am 
Hibernate Team
Hibernate Team

Joined: Fri Oct 05, 2007 4:47 pm
Posts: 2536
Location: Third rock from the Sun
Hi, there are several problems here, the first one that you are posting in the wrong forum.
For JBoss5 EJB3 :
http://www.jboss.org/index.html?module=bb&op=viewforum&f=221
or for EntityManager:
http://forum.hibernate.org/viewforum.php?f=1
But I'd suggest the JBoss forum for this question.

Some more tips to get answers:
To understand a question about "NullPointer at line XX" you should post the line numbers; also formatting the stacktrace my help a lot.
Also when deploying to JBoss5 you don't need to configure c3p0 database connection pools, you should configure it in the datasource definition deployed to JBoss, read the datasource reference docs.

_________________
Sanne
http://in.relation.to/

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