[jetty-users] Maven Jetty Plug-in + WebApplicationInitializer throw NPE

[Robert Novotny <robert.novotny@xxxxxxx>]

Hi,
I have created a simple tutorial project that uses Spring 3.2 web 
application without web.xml, using WebApplicationInitializer mechanism 
instead.

However, whenever I setup manual reloading within Maven plugin:
            <configuration>
                <reload>manual</reload>
            </configuration>

and press Enter within the console, the application context gets 
reloaded, but the WebApplicationInitializer throws a 
NullPointerException (see below)

I am attaching a simple project, which indicated that the reason may lie 
in the WebApplicationInitializer or the servletcontext not being 
properly cleaned up in the undeployment phase. The actual line is:

    ServletRegistration.Dynamic dispatcher = 
servletContext.addServlet("dispatcher", new DispatcherServlet(ctx));

while addServlet() method returns null whenever the servlet is already 
mapped. However, the freshly deployed application should not have this 
servlet already mapped and it should not return null.

This issue affects the 8.1.x branch as well, the last version of Jetty 
Maven plug-in that works without NPEs is the 8.1.9.v20130131.

The exception is:

java.lang.NullPointerException
        at 
jettybug.WebApplicationInitializer.onStartup(WebApplicationInitializer.java:22)
        at 
org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:180)
        at 
org.eclipse.jetty.plus.annotation.ContainerInitializer.callStartup(ContainerInitializer.java:105)
        at 
org.eclipse.jetty.annotations.ServletContainerInitializerListener.doStart(ServletContainerInitializerListener.java:107)
        at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
        at 
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:108)
        at 
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:82)

Robert

Attachment: jetty-webinitializer-npe.zip
Description: Zip compressed data