users@jersey.java.net

Re: NullPointerException

From: Roan Brasil Monteiro <roanbrasil_at_gmail.com>
Date: Fri, 23 Oct 2009 15:29:56 -0200

Ok.
All are in my src/main/java sourcefolder;

@Stateless
public class BaseDAOImpl<T> implements BaseDAO<T>{


    @PersistenceUnit(unitName = "citespacePU")
    public EntityManagerFactory emf;

...


@Remote
public interface BaseDAO<T> {
...



@Path("/user/")
public class UserResource {

    @GET
    @Produces("text/plain")

    public String registerUser(){

           BaseDAOImpl<Country> countryDAO = new BaseDAOImpl<Country>(emf);
           List<Country> c = countryDAO.listCountry();
...

2009/10/23 Roan Brasil Monteiro <roanbrasil_at_gmail.com>

> Hello,
>
> I got the Bookmark example, it has jersey e JPA integrate, I would like to
> add EJB lib, and I did. My question is, do I need to set up the web.xml
> file? What should I add? Currently my web.xml is like bellow. Do I need to
> configure something else? I am getting NullPointerException when I made my
> BaseDAOImpl with @Stateless anotation implementing a @Remote interface
> BaseDAO and on the BaseDAOImpl I am injecting with @PersistenceUnit on
> EntityManagerFactory, but I am getting NullPointerException, can someone
> help me please? P.S.-> My Resource class is calling the BaseDAOImpl.
>
> <?xml version="1.0" encoding="UTF-8"?>
> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
> http://java.sun.com/xml/ns/javaee
> http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
> <servlet>
> <servlet-name>Jersey Web Application</servlet-name>
>
> <servlet-class>com.sun.jersey.server.impl.container.servlet.ServletAdaptor</servlet-class>
> <init-param>
> <param-name>com.sun.jersey.config.feature.Redirect</param-name>
> <param-value>true</param-value>
> </init-param>
> <init-param>
> <param-name>unit:citespacePU</param-name>
> <param-value>persistence/citespace</param-value>
> </init-param>
> <load-on-startup>1</load-on-startup>
> </servlet>
> <servlet-mapping>
> <servlet-name>Jersey Web Application</servlet-name>
> <url-pattern>/resources/*</url-pattern>
> </servlet-mapping>
> <session-config>
> <session-timeout>
> 30
> </session-timeout>
> </session-config>
> <welcome-file-list>
> <welcome-file>
> index.jsp
> </welcome-file>
> </welcome-file-list>
> <persistence-unit-ref>
>
> <persistence-unit-ref-name>persistence/citespace</persistence-unit-ref-name>
> <persistence-unit-name>citespacePU</persistence-unit-name>
> </persistence-unit-ref>
> <resource-ref>
> <res-ref-name>UserTransaction</res-ref-name>
> <res-type>javax.transaction.UserTransaction</res-type>
> <res-auth>Container</res-auth>
> </resource-ref>
> </web-app>
>
>
> --
> Atenciosamente,
>
> Roan Brasil Monteiro
> http://roanbrasil.wordpress.com/
>



-- 
Atenciosamente,
Roan Brasil Monteiro
http://roanbrasil.wordpress.com/