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How to Fix Null Pointer Exception When calling Implementation Via Interface from Another Module
almost 7 years ago
almost 7 years ago
Both com.airline.client and com.airline.web has dependency to com.airline.model. But they have no dependency to each other.
AirlineClient and AirlineClientImp are normal java classes (no EJB,CDI..) and Airline is a WebServlet.
But when I deploy the project on glassfish I always get NullPointer exception :(
public class AirlineClientImpl implements AirlineClient {private ResteasyWebTarget webTarget;private ResteasyClient client;public AirlineClientImpl() {client = new ResteasyClientBuilder().build();}public AirlineInformation getAirline(City city) throws IOException {....}}
public class AirlineClientImpl implements AirlineClient {
private ResteasyWebTarget webTarget;
private ResteasyClient client;
public AirlineClientImpl() {
client = new ResteasyClientBuilder().build();
}
public AirlineInformation getAirline(City city) throws IOException {
....
}
}
@WebServlet("/Airline")public class Airline extends HttpServlet {private static final long serialVersionUID = 1L;@InjectAirlineClient client;public Airline() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {....AirlineInformation airline = client.getAirline(city);....}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {}}
@WebServlet("/Airline")
public class Airline extends HttpServlet {
private static final long serialVersionUID = 1L;
@Inject
AirlineClient client;
public Airline() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
....
AirlineInformation airline = client.getAirline(city);
....
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
When i deploy the project and call a website which calls Airline servlet I get null pointer exception here: client.getAirline().
Thank you a a lot for all the help.
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