[jetty-users] NullPointerException during JSP access?

[Kristian Rink <kawazu428@xxxxxxxxx>]

Folks;

another strange exception bugging my running application recently (after 
upgrading to jetty 9.2.5): Pretty often, I see large stack traces like 
the one below in my log, which I _guess_ to be jetty complaining about 
missing JSPs, but I can't tell which ones. Looking at the log, I see 
rather well at which time in the web application this happens, but at 
least looking at the web app itself, this error is not visible to the user.

I'm running an embedded jetty in a .jar application and use maven jetty 
plugin to precompile JSPs. Any idea what could cause this exception? Any 
place to look for more details?

TIA and all the best,
Kristian


2014-11-24 21:06:10,284 [qtp291339907-41] WARN 
o.e.jetty.servlet.ServletHandler -
org.apache.jasper.JasperException: java.lang.NullPointerException
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:440) 
~[javax.servlet.jsp-2.3.2.jar:2.3.2]
        at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473) 
~[javax.servlet.jsp-2.3.2.jar:2.3.2]
        at 
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377) 
~[javax.servlet.jsp-2.3.2.jar:2.3.2]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
~[javax.servlet-api-3.1.0.jar:3.1.0]
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:800) 
~[jetty-servlet-9.2.5.v20141112.jar:9.2.5.v20141112]
        at
[...]
Caused by: java.lang.NullPointerException: null
        at 
org.apache.jasper.JspCompilationContext.incrementRemoved(JspCompilationContext.java:605) 
~[javax.servlet.jsp-2.3.2.jar:2.3.2]
        at 
org.apache.jasper.servlet.JspServletWrapper.jspFileNotFound(JspServletWrapper.java:483) 
~[javax.servlet.jsp-2.3.2.jar:2.3.2]
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:350) 
~[javax.servlet.jsp-2.3.2.jar:2.3.2]
        ... 52 common frames omitted