Hibernate ServiceImplementation throws NullPointerException

Question

I have a problem with my program using Spring and Hibernate.
I have this classes:
departament.java

@Entity
@Table(name="apps_departaments")
public class Departament
{
    @Id
    @GeneratedValue
    private int id;

    @Column(name="dep_codi")
    private String CodDep;

    @Column(name="dep_nomc")
    private String nom;

    @Column(name="dep_nomm")
    private String nomCurt;
}

departamentDAO.java

public interface DepartamentDAO
{
    public void afegirDepartament(Departament dep);
    public List<Departament> getDepartaments();
}

departamentDAOImpl.java

@Repository
public class DepartamentDAOImpl implements DepartamentDAO
{
    @Autowired
    private SessionFactory sessionFactory;

    public void afegirDepartament(Departament dep)
    {
        sessionFactory.getCurrentSession().save(dep);
    }

    public List<Departament> getDepartaments()
    {
        return (List<Departament>)(sessionFactory.getCurrentSession().createCriteria(Departament.class).list());
    }
}

departamentService.java

public interface DepartamentService
{
    public void afegirDepartament(Departament dep);
    public List<Departament> getDepartaments();
}

departamentServiceImpl.java

@Service
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class DepartamentServiceImp implements DepartamentService
{
    @Autowired
    private DepartamentDAO depDAO;

    @Transactional(propagation = Propagation.REQUIRED, readOnly = false)
    @Override
    public void afegirDepartament(Departament dep)
    {
        depDAO.afegirDepartament(dep);
    }

    @Override
    public List<Departament> getDepartaments() {
        return depDAO.getDepartaments();
    }
}

My configuration settings are:
web-application-config.xml

<?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:p="http://www.springframework.org/schema/p"
   xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="net.grupgirona.intranet" />
    <context:annotation-config />
    <context:property-placeholder location="classpath*:jdbc.properties"/>
    <import resource="webmvc-config.xml" />
    <import resource="webflow-config.xml" />
    <import resource="data-access-config.xml" />
</beans>

data-access-config.xml

<?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:tx="http://www.springframework.org/schema/tx"
   xmlns:p="http://www.springframework.org/schema/p"
   xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource"
    p:driverClassName="${jdbc.driverClassName}"
    p:url="${jdbc.databaseurl}" p:username="${jdbc.username}"
    p:password="${jdbc.password}" />

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
        </props>
    </property>
    <property name="packagesToScan" value="net.grupgirona.dades"/>
  </bean>

  <bean id="transactionManager"
    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
  </bean>
</beans>

Ok, when i try to acces data that way:

DepartamentServiceImp dades = new DepartamentServiceImp();

I get a NullPointerException (dades is null when debugging).
When I read the hibernate output, it seems not be strange things, and the connection with the database brings up (hibernate has been created the table app_departaments correctly).
I don't know if I missing something in configuration, or what.

I will appeciate any help.

StackTrace

java.lang.NullPointerException at com.hpcds.grupgirona.dades.service.imp.DepartamentServiceImp.getDepartaments(DepartamentServiceImp.java:57) at com.hpcds.grupgirona.components.plantilla.LlistatDepartament.encodeEnd(LlistatDepartament.java:51) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1850) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:440) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:202) at org.springframework.faces.mvc.JsfView.renderMergedOutputModel(JsfView.java:85) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:574) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 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:222) 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:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) 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:1004) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

Try to do something like this DepartamentService dades = new DepartamentServiceImp(); Also, please send the stacktrace error, so can identify the root cause. — Manoj Kathiriya
EsteveBlanch : Yeah, you are right, i forgot your bean is marked with annotation. — Manoj Kathiriya

shazin shazin · Accepted Answer · 2013-01-16T12:25:45

You can not use this line

DepartamentServiceImp dades = new DepartamentServiceImp();

because you have an @Autowired annotated state variable in DepartamentServiceImp.

Spring doesn't encourage the use of new keyword. All the instances you need must be instantiated and retrieved from the spring context.

Have a setter DepartamentDAO in DepartamentServiceImp and set the dao if you still want to instantiate the object yourself.

Hibernate ServiceImplementation throws NullPointerException

1 Answers