[resolvido] Erro na hora de persistir os dados no EntityManager

Assuntos Gerais
#1

Olá estou com um erro na hora de persistir os dados, Estou usando vRaptor, spring 3, hib 4, tomcat 7 e Firebird 2.5

segue o erro

SEVERE: Servlet.service() for servlet [default] in context with path [/goodbuy] threw exception
br.com.caelum.vraptor.InterceptionException: exception raised, check root cause for details: java.lang.NullPointerException
	at br.com.caelum.vraptor.interceptor.ExecuteMethodInterceptor.intercept(ExecuteMethodInterceptor.java:96)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.ParametersInstantiatorInterceptor.intercept(ParametersInstantiatorInterceptor.java:93)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:59)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.util.jpa.JPATransactionInterceptor.intercept(JPATransactionInterceptor.java:51)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:71)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
	at br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:91)
	at br.com.caelum.vraptor.ioc.spring.SpringProvider.provideForRequest(SpringProvider.java:58)
	at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:88)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at br.com.caelum.goodbuy.dao.hibernate.GenericDaoJpa.save(GenericDaoJpa.java:44)
	at br.com.caelum.goodbuy.controller.ProdutosController.adiciona(ProdutosController.java:23)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at br.com.caelum.vraptor.interceptor.ExecuteMethodInterceptor.intercept(ExecuteMethodInterceptor.java:61)
	... 46 more

Debuguei e verifiquei que o objeto Produto está populado, apenas a ide não está pois ela é @GeneratedValue.
primeiramente só criei o bd e deixei o Hibernate criar a tabela, não funcionou.
Depois recriei o bd e criei a tabela Produto (uso o Firebird) criei o generator e criei a trigger para associar o valor do generator ao compo id.
Mas nada funcionou.

o meu dao generico é o seguinte:

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import br.com.caelum.goodbuy.dao.GenericDao;
import br.com.caelum.goodbuy.domain.DomainObject;

@PersistenceContext
public class GenericDaoJpa<T extends DomainObject> implements GenericDao<T> {

	private Class<T> type;
	protected EntityManager entityManager;

	public GenericDaoJpa(Class<T> type) {
		super();
		this.type = type;
	}

	public void setEntityManager(EntityManager entityManager) {
		this.entityManager = entityManager;
	}

	@Override
	public T get(Long id) {
		if (id == null) {
			return null;
		} else {
			return entityManager.find(type, id);
		}
	}

	@SuppressWarnings("unchecked")
	@Override
	public List<T> getAll() {
		return entityManager.createQuery(
				"select o from " + type.getName() + "o").getResultList();
	}

	@Override
	public void save(T object) {
		entityManager.persist(object);
	}

	@Override
	public void remove(T object) {
		entityManager.remove(object);
	}

}

e esse é o meu ProdutoDao extendido do dao generico:

import org.springframework.stereotype.Repository;

import br.com.caelum.goodbuy.dao.hibernate.GenericDaoJpa;
import br.com.caelum.goodbuy.domain.Produto;
import br.com.caelum.vraptor.ioc.Component;

@Repository
@Component
public class ProdutoDao extends GenericDaoJpa<Produto> {

	public ProdutoDao() {
		super(Produto.class);
	}

}
#2

Como seu método save só tem uma linha, e tem isso aqui na stackTrace:[quote]Caused by: java.lang.NullPointerException
at br.com.caelum.goodbuy.dao.hibernate.GenericDaoJpa.save(GenericDaoJpa.java:44) [/quote]
Eu creio que seu EntityManager esteja null na hora do persist.

#3

É isso mesmo. O danado do EntityManager não está sendo injetado.

vou passar meus xml’s:

persistence.xml
[/code]

<?xml version="1.0" encoding="UTF-8"?>



org.hibernate.ejb.HibernatePersistence













[/code]

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">
	<display-name>goodbuy</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>

	<!-- configura o controlador do VRaptor -->
	<filter>
		<filter-name>vraptor</filter-name>
		<filter-class>br.com.caelum.vraptor.VRaptor</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>vraptor</filter-name>
		<url-pattern>/*</url-pattern>
		<dispatcher>FORWARD</dispatcher>
		<dispatcher>REQUEST</dispatcher>
	</filter-mapping>

	<jsp-config>
		<jsp-property-group>
			<description>goodbuy</description>
			<display-name>Good Buy</display-name>
			<url-pattern>*.jsp</url-pattern>
			<include-prelude>/header.jsp</include-prelude>
			<include-coda>/footer.jsp</include-coda>
		</jsp-property-group>
	</jsp-config>

	<context-param>
		<param-name>br.com.caelum.vraptor.packages</param-name>
		<param-value>
        	br.com.caelum.vraptor.util.jpa
    	</param-value>
	</context-param>
 
	<context-param>
		<param-name>br.com.caelum.vraptor.provider</param-name>
		<param-value>br.com.caelum.vraptor.util.jpa.JPACustomProvider</param-value>
	</context-param>

</web-app>
#4

o vraptor não funciona com a @PersistenceContext… se vc quer o entityManager precisa receber no construtor, ou usar o @Autowired/@Inject no setter.

#5