@PersistenceContext EntityManaer nullPointerException
Bonjour,
Mon EntityManager avec mon annotation @PersistenceContext est toujours null, je ne comprends pas pourquoi. Cela doit etre une betise :(
Voici la traceback:
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SEVERE: Servlet.service() for servlet springapp threw exception
java.lang.NullPointerException at com.mashup.dao.UserDAOImpl.findById(UserDAOImpl.java:42) |
Et voici les differents fichiers concernes:
com.mashup.dao.UserDAOImpl.java EntityManager NullPointerException
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@Stateless
public class UserDAOImpl {
private EntityManager entityManager;
@PersistenceContext(unitName = "example")
public void setEntityManager(EntityManager entityManager) {
this.entityManager = entityManager;
}
public EntityManager getEntityManager() {
return entityManager;
}
public User findById(String i) {
// /!\ Ici se trouve le nullPointerException /!\
// /!\ Ici se trouve le nullPointerException /!\
// /!\ Ici se trouve le nullPointerException /!\
System.out.println(entityManager.toString());
// /!\ Ici se trouvait le nullPointerException /!\
// /!\ Ici se trouvait le nullPointerException /!\
// /!\ Ici se trouvait le nullPointerException /!\
log.debug("getting Users instance with id: " + i);
try {
User instance = entityManager.find(User.class, i);
return instance;
} catch (RuntimeException re) {
throw re;
}
}
} |
com.mashup.models.User.java
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@Entity
public class User {
@Id
@GeneratedValue
private Long id;
private String name;
private String login;
private String password;
// Avec les getters et les setters en dessous |
com.mashup.controllers.HelloController.java
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public class HelloController implements Controller {
private UserDAOImpl userDAOImpl;
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// Ce bloc fonctionne bien, la connexion est etablie
// ----
EntityManagerFactory emf = Persistence.createEntityManagerFactory("example");
EntityManager em = emf.createEntityManager();
em.close();
emf.close();
// ----
this.userDAOImpl.findById("0");
return new ModelAndView("hello", "now", now);
}
public UserDAOImpl getUserDAOImpl() {
return userDAOImpl;
}
public void setUserDAOImpl(UserDAOImpl userDAOImpl) {
this.userDAOImpl = userDAOImpl;
}
} |
META-INF/persistence.xml
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<?xml version="1.0" encoding="UTF-8"?>
<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/persistence_1_0.xsd"
version="1.0">
<persistence-unit name="example" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="hibernate.ejb.cfgfile" value="META-INF/hibernate.cfg.xml" />
<property name="hibernate.c3p0.min_size" value="5" />
<property name="hibernate.c3p0.max_size" value="20" />
<property name="hibernate.c3p0.timeout" value="300" />
<property name="hibernate.c3p0.max_statements" value="50" />
<property name="hibernate.c3p0.idle_test_period" value="3000" />
</properties>
</persistence-unit>
</persistence> |
WEB-INF/spring-app-servlet.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="userDAOImpl" class="com.mashup.dao.UserDAOImpl">
</bean>
<bean name="/hello.htm" class="com.mashup.controllers.HelloController">
<property name="userDAOImpl" ref="userDAOImpl"/>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans> |
WEB-INF/applicationContext.xml
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean" />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven />
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcesser" />
<context:annotation-config />
<!-- <context:spring-configured />-->
</beans> |
Merci
