Simple interceptor won't invoke

Question

Hi,
I'm trying to implement my first interceptor in EJB3 (in glassfish v3 final and netbeans 6.8) but the method wont invoke. I have checked the syntax a number of times and I can't see what's going wrong.
Can anyone help?
The class using the interceptor:
import javax.ejb.Stateless;
import javax.interceptor.Interceptors;
import javax.jws.WebService;
@Interceptors(MyLogger.class)
@Stateless @WebService
public class Configuration
    public Settings getSettings()
        return new Settings();
}The interceptor class:
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
public class MyLogger
    private Logger logger = Logger.getLogger(this.getClass());
    @AroundInvoke
    public Object logMethodCall(InvocationContext invocationContext) throws Exception
        logger.info(invocationContext.getMethod().getName());
        if (logger.getLevel() == Level.DEBUG)
            StringBuffer str = new StringBuffer();
            for (Object parameter: invocationContext.getParameters())
                if (str.length() != 0)
                    str.append(", ");
                str.append(parameter);
            logger.debug("Parameters: " + str);
        return invocationContext.proceed();
}Thanks
Edited by: petergibbons on Dec 21, 2009 8:09 PM

Answer 1

If you have an instance of the class (the singleton), it needs to be constructed. The class therefore must have either no constructor, (in which case the compiler will create one for you), or a defined constructor that is used to construct it. If you need to construct the object with a constructor that you don't define (provide a body for), the program cannot work.