Injecting osgi service reference Null Pointer

[Christian A]

Hello,

I'm trying to use the Spring-DM service-reference to inject a service exportet by a backend bundle into a frontend bundle, but I keep getting a Null pointer, as if the service didn't exist. I checked and the backend bundle with the service is up an running with the correct interface.

Here is a look at the ServiceConnector of the frontend bundle and it's configuration:

public class ServiceConnector implements IServiceConnector {
	
	private IUserSessionLifecycle userSessionServiceReference;
	
	public ServiceConnector() {
		super();		
	}

	public IUserSession getValidUserSession(String email, String password)
	{
		return userSessionServiceReference.getUserSession(email, password);
	}
}

<osgi:reference id="userSessionServiceReference" interface="de.idarewest.backend.service.transaction.IUserSessionLifecycle"/>
       
    <bean id="serviceConnector" scope="prototype"
		class="de.pascada.idarewest.ServiceConnector">	
		<property name="userSessionServiceReference" ref="userSessionServiceReference"/> 		
	</bean>

When the service-connector is invoked it throws a null pointer, so it definitely means the userSessionService is not being injected.

The userSessionService is configured as follows:

public interface IUserSessionLifecycle {

	public abstract IUserSession getUserSession(String email, String password);

	public abstract IUserAccount getUserAccountByEmail(String email);

}

<bean id="IUserSession" name="userSessionBean" scope="prototype"
		class="de.idarewest.backend.service.transaction.UserSessionLifecycle">			
	</bean>
	
	<osgi:service id="userSessionService" ref="userSessionBean"  
			 interface="de.idarewest.backend.service.transaction.IUserSessionLifecycle" />

After the deployment of both bundles Spring-DM confirms the service import as follows:

17:42:47,195  INFO OsgiServiceProxyFactoryBean:470 - Looking for mandatory OSGi service dependency for bean [userSessionServiceReference] matching filter (objectClass=de.idarewest.backend.service.transaction.IUserSessionLifecycle)
17:42:47,369  INFO OsgiServiceProxyFactoryBean:476 - Found mandatory OSGi service for bean [userSessionServiceReference]

Any ideas why this Spring-DM is not injecting the service ?

Thanks for any help

[polosatiy]

Hi!

Try to change

<osgi:service id="userSessionService" ref="userSessionBean"  
			 interface="de.idarewest.backend.service.transaction.IUserSessionLifecycle" />

to

<osgi:service id="userSessionService" ref="IUserSession"  
			 interface="de.idarewest.backend.service.transaction.IUserSessionLifecycle" />