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[jetty-dev] NPE on PushCacheFilter
hi,

I am experimenting with Jetty 9.3.0.v20150612 and HTTP2 to try to reduce the load time of my _javascript_ web application.

The application needs to load about 60 resources (.js etc) for a total of 3.8Mb and I was hoping that HTTP2 would help.

I am serving my static files through DefaultServlet configured as shown in the default web.xml, the only difference being "useFileMappedBuffer=true"

I added the PushCacheFilter to my web.xml as shown on https://eclipse.org/jetty/documentation/current/http2-configuring-push.html

(As a side note, in order to make PushCacheFilter work, I add to add jetty-http-9.3.0.v20150612.jar, jetty-server, jetty-servlets,jetty-util to WEB-INF/lib and that might be worth adding to the documentation)

With the PushCacheFilter enabled  I get the following stacktrace:

java.lang.NullPointerException: null
        at org.eclipse.jetty.servlets.PushCacheFilter.doFilter(PushCacheFilter.java:119) ~[jetty-servlets-9.3.0.v20150612.jar:9.3.0.v20150612]
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1667) ~[jetty-servlet-9.3.0.v20150612.jar:9.3.0.v20150612]
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581) [jetty-servlet-9.3.0.v20150612.jar:9.3.0.v20150612]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) [jetty-server-9.3.0.v20150612.jar:9.3.0.v20150612]


Having a look at the code, it looks like org.eclipse.jetty.server.Request.getBaseRequest(ServletRequest) returns null.

This could be because the request is not an instance of any of the classes considered in the method (maybe because HTTP2 requests are wrapped differently?).

Another side note: I have tested the load time with HTTP2 (no PushCacheFilter) and HTTPS and so far I am getting better results with HTTPS (Chrome 43.0.2357.130 m).
However I have not been able to test on an isolated network and my tests show quite a bit of variance so for now I am not convinced of my results.
I am just interested to find out if anybody else has obtained anything similar and whether the browsers could be responsible.


I really hope I am not wasting your time with one of those stupid configuration errors.

Many thanks,
Michele






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