NullPointerException when @Autowiring in AppUI.init (just on standalone/pro

Flow
1

Hello

I face problem I cannot solve.
Using:
vaadin 8.1.5
springboot 1.5.4
vaading4spring 2.0.0.RELEASE (tried also 0.0.7.RELEASE, same error)

My code:

@SpringUI
public class AppUI extends UI {

@Autowired
private MainScreen mainScreen;

@Override
protected void init(VaadinRequest request) {
Responsive.makeResponsive(this);
addStyleName(ValoTheme.UI_WITH_MENU);

final Navigator navigator = new Navigator(this, mainScreen.getContainer());
navigator.addProvider(viewProvider);
navigator.setErrorView(errorView);
navigator.addViewChangeListener(appViewChangeListener);
setScreen();

...
}}
@UIScope
@SpringComponent
public class MainScreen extends MainScreenDesign implements AppScreen {...}
@SpringBootApplication()
@Primary
public class LimsApplication extends SpringBootServletInitializer {

@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}

public static void main(String args) {
SpringApplication.run(LimsApplication.class, args);
}

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(LimsApplication.class);
}
}

Works when running on embedded tomcat via command spring-boot:run, application works,
but throws NullPointerException on production server or standalone, when deploying as WAR. (my packaging in pom.xml is WAR in both cases)

Both Tomcats are 8.5.15.

2017-12-06 17:52:10.918 INFO 4336 --- [nio-8080-exec-7]
 o.v.spring.servlet.Vaadin4SpringServlet : Custom Vaadin4Spring servlet initialization completed
2017-12-06 17:52:11.356 ERROR 4336 --- [nio-8080-exec-8]
 com.vaadin.server.DefaultErrorHandler :

java.lang.NullPointerException: null
at sk.geneton.lims.frontend.ui.AppUI.init(AppUI.java:101)
at com.vaadin.ui.UI.doInit(UI.java:745)

Attached you can find complete tomcat logs when starting on embedded tomcat and standalone tomcat.

I guess it’s something with vaadin and spring sessions, but cannot find solution.

Hope somebody helps me.

Michal Lichvar

39501.txt (50.4 KB)
39502.txt (157 KB)

2

Ok, we found the problem, it was in code below (static class at the end of AppUI, used to change system messages)

@WebServlet(urlPatterns = "/*", name = "CustomUIServlet", asyncSupported = true)
@VaadinServletConfiguration(ui = AppUI.class, productionMode = false)
public static class CustomUIServlet extends VaadinServlet {

   @Override
   protected void servletInitialized() throws ServletException {
      super.servletInitialized();

      CustomizedSystemMessages messages = new CustomizedSystemMessages();

      // Internal Error (after JWT expired exception) overwritten to Connection Timeout
      messages.setInternalErrorCaption("Connection timeout");
      messages.setInternalErrorMessage("Take note of any unsaved data, and <u>click here</u> or press ESC to continue.");

      getService().setSystemMessagesProvider(e -> messages);

   }
}

solution: change VaadinServlet to SpringVaadinServlet :smiley: