cannot access to annotated spring service

Question

I'm trying to access @Service defined class

Interfaces are defined, here is an implementation

    @Service
    public class TypeServiceImpl implements TypeService {

        @Autowired
        TypeDAO dao;

        public List<DocType> findAll() {
 System.out.println("accessing findAll"); //have no appearence
 return dao.findAll();
}

public TypeDAOImpl() { System.out.println("Constructing TypeDAOImpl"); }

...

}

code for DAO:

@Repository
public class TypeDAOImpl extends BaseDAO<Type, Long> implements TypeDAO{

}

BaseDAO:

public class BaseDAO<T, ID extends Serializable> extends GenericDAOImpl<T, ID> {

    @Autowired
    @Override
    public void setSessionFactory(SessionFactory sessionFactory) {
     super.setSessionFactory(sessionFactory);
    }
}

used generic dao configuration for app loads fine(no warn or err), but when I'm trying to use service:

@Autowired
private TypeService TypeService;
public void init() {

     try {
      for (Type d : TypeService.findAll()) {
       System.out.println(d.getType());
      }
     } catch (Exception e) {
      e.printStackTrace();
     }
}

in applicationContext:

<!-- Use annotations (@Autowired) for property injection -->
    <context:annotation-config />

in logs: INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@14db0e3: ... typeDAOImpl,appMain, typeServiceImpl

my web.xml

<context-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath:/config/application-context.xml,classpath:/config/datasource-context.xml</param-value>
    </context-param>
    <context-param>
     <description>
    Vaadin production mode</description>
     <param-name>productionMode</param-name>
     <param-value>false</param-value>
    </context-param>
    <listener>
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
     <listener>
     <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener> 
     <servlet>
     <servlet-name>My Application</servlet-name>
     <servlet-class>com.vaadin.terminal.gwt.server.ApplicationServlet</servlet-class>
     <init-param>
      <description>
     Vaadin application class to start</description>
      <param-name>application</param-name>
      <param-value>myapp.main.MainApp</param-value>
     </init-param>
    </servlet>
    <servlet-mapping>
     <servlet-name>My Application</servlet-name>
     <url-pattern>/*</url-pattern>
    </servlet-mapping>
...

stack trace is "very informational" (I used vaadin as web framework)

java.lang.NullPointerException at main.AppMain.init(AppMain.java:26) at com.vaadin.Application.start(Application.java:497) at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.startApplication(AbstractApplicationServlet.java:1001) at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:411) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) at java.lang.Thread.run(Unknown Source)

Any suggestions?

I added constructors for GenericDAOHibernate and TypeDAOImpl, so as I understand, these beans are initialized ... 12.10.2009 12:57:48 org.hibernate.impl.SessionFactoryImpl INFO: building session factory 12.10.2009 12:57:48 org.hibernate.impl.SessionFactoryObjectFactory addInstance INFO: Not binding factory to JNDI, no JNDI name configured Constructing Generic DAO Constructing TypeDAOImpl 12.10.2009 12:57:48 org.springframework.web.context.ContextLoader initWebApplicationContext ...

I don't understand because this config worked with ZK..

Answer 1

Code you've posted is rather inconsistent.

findAll() method is not declared anywhere; plus service implementation implements Service but you're trying to autowire it into TypeService which is not going to work.

If the first code fragment was instead written as:

@Service
public class TypeServiceImpl implements TypeService {

and it was the only TypeService implementation in your app context, auto-wiring would have worked.