http://www.guj.com.br/posts/list/5.java JForum - http://www.jforum.net
Pra detalhe, estou usando glassfish, as configuirações de senha e tale stá ok, tanto q funciona transação ou consulta no servlet somente quando absatraio que pego NullPointerException...

[code]
package com.citespace.citespacerest.dao;

import java.util.List;

import javax.ejb.Local;
import javax.ejb.Remote;
import javax.persistence.EntityExistsException;
import javax.persistence.TransactionRequiredException;

@Remote
public interface BaseDAO<T> {
public List<T> listCountry();
}
[/code]

[code]
package com.citespace.citespacerest.dao.impl;


import java.util.List;

import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.persistence.Query;

import com.citespace.citespacerest.dao.BaseDAO;
import com.citespace.cms.model.Country;

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


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

@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)

public List<T> listCountry(){

EntityManager em = emf.createEntityManager();
try{
Query q = em.createQuery("Select c from Country c ");

List<Country> c = q.getResultList();
return (List<T>) c;
}finally{
if (em != null && em.isOpen()) {
em.close();
}
}

}
}
[/code]


[code]
package com.citespace.citespacerest;

import java.util.List;

import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;


import com.citespace.citespacerest.dao.impl.BaseDAOImpl;
import com.citespace.cms.model.Country;


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

@GET
@Produces("text/plain")
public String registerUser(){

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

String y = "";
for(Country x: c){
y = y + ":" +x.getName();
}

return "[Lista de Países]:"+y;
}

}
[/code]


[code]
<?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>

[/code]



[code]
<?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="citespacePU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>jdbc/TestDS</jta-data-source>
<!-- <jar-file>/home/roan/Desktop/MyWorkspaces/workspace2/lib/citespace-persistence.jar</jar-file> -->
<properties>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.connection.characterEncoding" value="UTF-8"/>
</persistence-unit>
</persistence>

[/code]


]]> http://www.guj.com.br/posts/preList/142318/766955.java http://www.guj.com.br/posts/preList/142318/766955.java GMT
[code]
[#|2009-10-23T12:32:13.416-0200|SEVERE|sun-appserver2.1|javax.enterprise.system.container.web|_ThreadID=17;_ThreadName=httpSSLWorkerThread-8080-2;_RequestID=761422a8-75a1-4a48-8d70-6722f4306fe6;|StandardWrapperValve[Jersey Web Application]: PWC1406: Servlet.service() for servlet Jersey Web Application threw exception
java.lang.NullPointerException
at com.citespace.citespacerest.dao.impl.BaseDAOImpl.listCountry(BaseDAOImpl.java:32)
at com.citespace.citespacerest.UserResource.registerUser(UserResource.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:156)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:163)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:71)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:63)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:654)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:612)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:603)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:309)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:425)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:590)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(PortUnificationPipeline.java:380)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
|#]
[/code]]]> http://www.guj.com.br/posts/preList/142318/766956.java http://www.guj.com.br/posts/preList/142318/766956.java GMT Como está seu jdbc/TestDS, poderia posta-lo.
Qual servidor de aplicação está usando ?]]> http://www.guj.com.br/posts/preList/142318/767032.java http://www.guj.com.br/posts/preList/142318/767032.java GMT
Eu estou com um projeto utilizando Jersey Rest web services. Gerei o projeto com maven2 e estou usando o JPA. A classe Jersey se chama Resource que é nada mais nada menos que um Servlet. Por exemplo o resource: O código abaixo funciona normalmente.

[code]
@Path("/user/")
public class UserResource {


@PersistenceUnit(unitName="PU")
EntityManagerFactory emf;


@GET
@Produces("text/plain")
public String registerUser(){

EntityManager em = emf.createEntityManager();
... //consulta de código Query q= bla bla bla
[/code]


[b]@PersistenceUnit(unitName="PU")
EntityManagerFactory emf;


EntityManager em = emf.createEntityManager();
... //consulta de código Query q= bla bla bla[/b]

A partir do momento que tiro o que está em negrito no código acima e jogo em uma classe EJB @Stateless que implementa uma interface @Remote, simplesmente essa linha de chamada
EntityManager em = emf.createEntityManager();

que acrescentei na classe EJB, de nome por exemplo BaseDAOImpl, simplesmente dá uma exceção NullPointerException no EntityManager pois não conseguiu injetar da mesma forma o PersistenceUnit nessa classe como no exemplo acima.

Gostaria de saber como resolver esse problema?]]> http://www.guj.com.br/posts/preList/142318/767045.java http://www.guj.com.br/posts/preList/142318/767045.java GMT
[code]
@PersistenceContext(unitName="citespacePU")
protected EntityManager em;
[/code]
]]> http://www.guj.com.br/posts/preList/142318/767058.java http://www.guj.com.br/posts/preList/142318/767058.java GMT package com.citespace.citespacerest.dao.impl;


import java.util.List;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.NoResultException;
import javax.persistence.NonUniqueResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import com.citespace.citespacerest.dao.BaseDAO;
import com.citespace.cms.model.Country;

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


@PersistenceContext(unitName = "citespacePU")
protected EntityManager em;


public List<T> listCountry(){


List<Country> c = null;
try{
Query q = em.createQuery("Select c from Country c ");
c = q.getResultList();
}catch(NoResultException e){
System.err.println("NoResultException: "
+ e.getMessage());
}catch(NonUniqueResultException e){
System.err.println("NonUniqueResultException: "
+ e.getMessage());
}catch(IllegalStateException e){
System.err.println("IllegalStateException: "
+ e.getMessage());
}
finally{
if (em != null && em.isOpen()) {
em.close();
}
}

return (List<T>) c;

}
}

[/code]


fiz essa alteração e o erro continua ...

olha o strack trace agora


está no query q o erro

[code]
5a3-5b46896d4645;|StandardWrapperValve[Jersey Web Application]: PWC1406: Servlet.service() for servlet Jersey Web Application threw exception
java.lang.NullPointerException
at com.citespace.citespacerest.dao.impl.BaseDAOImpl.listCountry(BaseDAOImpl.java:39)
at com.citespace.citespacerest.UserResource.registerUser(UserResource.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:156)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:163)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:71)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:63)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:654)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:612)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:603)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:309)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:425)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:590)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(PortUnificationPipeline.java:380)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
|#]


[/code]]]> http://www.guj.com.br/posts/preList/142318/767062.java http://www.guj.com.br/posts/preList/142318/767062.java GMT