NullPointerException lors de l'injection d'un composant annoté @Autowired

**batanga09** · 08/08/2016, 17h28

bonjour tous,

Je viens vous soumettre un problème dont j'arrive pas à déterminer la cause après avoir lu et relu mon code et fouiller sur le net. J'ai une classe dao que j'injecte grâce à l'annotation @Autowired dans mes couches services qui sont elles même injectées dans mon controller. l'utilisation des l'instances de ces couches services dans mon controller provoque un "NullPointerException". Ma configuration semble pourtant bonne, je n'arrive pas à trouver ce qui cloche, je vous fournis mes classe car besoin d'aide.

ApplicationContext

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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.xsd
	                   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
	                   http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
 
   <context:annotation-config></context:annotation-config>
   <context:component-scan base-package="com.fluiding" />
 
 
   <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
		<property name="url" value="jdbc:mysql://localhost:3306/ma_bdd"></property>
		<property name="username" value="root"></property>
		<property name="password" value=""></property>
	</bean>
 
	<bean id="persistenceUnitManager" class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
		<property name="defaultDataSource" ref="datasource"></property>	
		<property name="persistenceXmlLocations">
		<list>
			<value>classpath*:META-INF/persistence.xml</value>		
		</list>
		</property>
	</bean>
 
	<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="persistenceUnitManager" ref="persistenceUnitManager"></property>
		<property name="persistenceUnitName" value="UP_P"></property>
	</bean>
 
	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="entityManagerFactory"></property>
	</bean>
 
 
	<tx:annotation-driven />
 
</beans>

controller

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@Controller
public class ControllerWeb {
 
    @Autowired
    UserValidator          validator;
 
    @Autowired
    ISignUPMetier          metier;
 
    @Autowired
    IUserDetailsServiveDAO service;
 
    private static int     manageRole = 0;
 
    @Autowired
    RoleFactory            roleFactory;
 
 
    @RequestMapping( value = "/inscription" )
    public String inscription( Model model ) {
        model.addAttribute( "user", new User() );
        return "inscription";
    }
 
    @RequestMapping( value = "/sendUser" )
    public String sendUser( @ModelAttribute( "user" ) User user, BindingResult result, HttpServletRequest request,
            HttpServletResponse response ) {
 
        if ( manageRole == 0 ) {
            // roleFactory = new RoleFactory();
            manageRole++;
        }
 
        String confirmMotDePasse = request.getParameter( "cmdp" );
 
        validator.validate( user, result );
        if ( !user.getMot_de_passe().equals( confirmMotDePasse ) || confirmMotDePasse == null ) {
            ObjectError error = new ObjectError( "confirmation", "mot de passe pas valide" );
 
            result.addError( error );
        }
 
        if ( result.hasErrors() ) {
            return "inscription";
        }
        user.setRole( roleFactory.getRoleUser() );
        metier.register( user );
 
        return "succes";
    }
 
    @RequestMapping( value = "/admin" )
    public String logout() {
        return "admin";
    }
 
}

mon DAO

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@Transactional
@Repository
public class SignUpDAOImpl implements ISignUpDAO {
 
    @PersistenceContext( name = "UP_P" )
    private EntityManager em;
 
    @Override
    public void register( User user ) {
 
        em.persist( user );
 
    }
 
    @Override
    public void createRole( Role role ) {
        em.persist( role );
    };
 
 
    }
 
    public List<User> userParRole( Role role ) {
        Query query = em.createQuery( "select u from User u where u.role=:x" );
        query.setParameter( "x", role );
        List<User> users = query.getResultList();
 
        return users;
    }
 
}

couche service (SignUpMetierImpl)

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@Transactional
@Service
public class SignUpMetierImpl implements ISignUPMetier {
 
    @Autowired
    ISignUpDAO dao;
 
    @Override
    public void register( User user ) {
 
        dao.register( user );
 
    }
/*********
la suite
********/
 
}

un autre service (RoleHandlerMetierImpl)

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@Service
public class RoleHandlerMetierImpl implements IRoleHandlerMetier {
 
    @Autowired
    ISignUpDAO dao;
 
    @Override
    public Role createRole( String roleName ) {
        Role role = new Role( roleName );
        return role;
 
    }
 
    @Override
    public void persistRole( Role role ) {
 
        dao.createRole( role );
    }
 
    @Override
    public List<Role> listRole() {
        return dao.listRole();
 
    }
 
    @Override
    public List<User> userParRole( Role role ) {
 
        return dao.userParRole( role );
    }
 
}

La classe RoleFactory

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@Component
public class RoleFactory extends RoleHandlerMetierImpl {
 
    Role roleUser;
    Role roleAdmin;
 
    public RoleFactory() {
 
        roleUser = createRole( "USER_ROLE" );
        roleAdmin = createRole( "ADMIN_ROLE" );
        persistRole( roleUser );
        persistRole( roleAdmin );
 
    }
 
    public Role getRoleUser() {
        return roleUser;
    }
 
    public Role getRoleAdmin() {
        return roleAdmin;
    }
 
}

Dès le demarrage du serveur j'ai une erreur lors de l'injection du bean "RoleFactory" à cause d'un "NullPointerException" dans son constructeur

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org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'controllerWeb': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: sap.ldee.metier.RoleFactory sap.ldee.web.ControllerWeb.roleFactory; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleFactory' defined in file [/local/home/fnjiokou/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/applicationPredict/WEB-INF/classes/sap/ldee/metier/RoleFactory.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [sap.ldee.metier.RoleFactory]: Constructor threw exception; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1055)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:511)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:562)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:871)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)
	at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:272)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:196)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4738)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5181)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: sap.ldee.metier.RoleFactory sap.ldee.web.ControllerWeb.roleFactory; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleFactory' defined in file [/local/home/fnjiokou/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/applicationPredict/WEB-INF/classes/sap/ldee/metier/RoleFactory.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [sap.ldee.metier.RoleFactory]: Constructor threw exception; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:507)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:283)
	... 22 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleFactory' defined in file [/local/home/fnjiokou/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/applicationPredict/WEB-INF/classes/sap/ldee/metier/RoleFactory.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [sap.ldee.metier.RoleFactory]: Constructor threw exception; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:946)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:892)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:479)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:825)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:767)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:685)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:478)
	... 24 more
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [sap.ldee.metier.RoleFactory]: Constructor threw exception; nested exception is java.lang.NullPointerException
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:141)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:72)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:939)
	... 35 more
Caused by: java.lang.NullPointerException
	at sap.ldee.metier.RoleHandlerMetierImpl.persistRole(RoleHandlerMetierImpl.java:28)
	at sap.ldee.metier.RoleFactory.<init>(RoleFactory.java:17)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:126)
	... 37 more

Si j'instancie mon controller sans faire appel à ce constructeur, il est bien instancié mais les objets injectés sont null..
Merci pour toute aide

NullPointerException lors de l'injection d'un composant annoté @Autowired

Spring Java

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