Undertow not detecting @HandlesTypes If the implentation class is inside EAR/lib -------------------------------------------------------------------------------- Key: WFLY-4205 URL: https://issues.jboss.org/browse/WFLY-4205 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 8.2.0.Final Environment: Wildfly 8.2.0 Final, EAR Deployment, Spring MVC, Ubuntu 14.04 Reporter: Nick . Assignee: Stuart Douglas Labels: EAR, servlet3.0, spring-mvc Fix For: 9.0.0.Beta1 Hi, I have spring mvc enabled web apps (20+ web apps) packaged as an EAR deployment. All my spring mvc related jar's are in my EAR/lib, i'm using SpringServletContainerInitializer (implementation of ServletContainerInitializer ) code as follows {code} @HandlesTypes(WebApplicationInitializer.class) public class SpringServletContainerInitializer implements ServletContainerInitializer { @Override public void onStartup(Set<Class<?>> webAppInitializerClasses, ServletContext servletContext) throws ServletException { List<WebApplicationInitializer> initializers = new LinkedList<WebApplicationInitializer>(); if (webAppInitializerClasses != null) { for (Class<?> waiClass : webAppInitializerClasses) { // Be defensive: Some servlet containers provide us with invalid classes, // no matter what @HandlesTypes says... if (!waiClass.isInterface() && !Modifier.isAbstract(waiClass.getModifiers()) && WebApplicationInitializer.class.isAssignableFrom(waiClass)) { try { initializers.add((WebApplicationInitializer) waiClass.newInstance()); } catch (Throwable ex) { throw new ServletException("Failed to instantiate WebApplicationInitializer class", ex); } } } } if (initializers.isEmpty()) { servletContext.log("No Spring WebApplicationInitializer types detected on classpath"); return; } AnnotationAwareOrderComparator.sort(initializers); servletContext.log("Spring WebApplicationInitializers detected on classpath: " + initializers); for (WebApplicationInitializer initializer : initializers) { initializer.onStartup(servletContext); } } } {code} But the @HandlesTypes(WebApplicationInitializer.class) are not getting detected from the EAR/lib Even i have tried adding the extracted the SPI from spring-web jar and added inside my war's WEB-INF/lib as a jar WEB-INF/lib/web-init-spi.jar which contains META-INF/services/javax.servlet.ServletContainerIntializer file with org.springframework.web.SpringServletContainerInitializer as an entry. This time its detecting SpringServletContainerInitializer but not detecting what defined in @HandlesTypes Its only working If i package all those spring mvc jars inside WEB-INF/lib then everything started working. I have no idea this is how the servlet specification works or its a wildfly issue but i see it as a problem for those who depends on Wildfly or similar EE Servers with an EAR deployment structure.