AtlasMapper does not work in Windows GeoServer Jetty

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What steps will reproduce the problem?
1. Download the windows GeoServer 2.4.5 installer and install it.
2. Add the AtlasMapper to the Jetty installation as per the wiki installation 
instructions. i.e. unpack the war to webapps/atlasmapper and set up the 
startup.bat to include -DATLASMAPPER_DATA_DIR="C:\Programs\GeoServer 
2.4.5\data_dir\atlasmapper"
3. Try to go to the Atlasmapper login page 
(http://localhost:9080/atlasmapper/public/admin.jsp). This page is broken and 
an expection is generated in the logs.

What is the expected output? What do you see instead?

38085 [btpool0-8] ERROR org.mortbay.log - 
/atlasmapper/extjs/4.0.2/ext-4.0.2/resources/css/ext-all.css
java.lang.NullPointerException
        at au.gov.aims.atlasmapperserver.servlet.compression.GZIPResponseWrapper.flushBuffer(GZIPResponseWrapper.java:94
)
        at org.mortbay.jetty.servlet.DefaultServlet.passConditionalHeaders(DefaultServlet.java:553)
        at org.mortbay.jetty.servlet.DefaultServlet.doGet(DefaultServlet.java:405)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
        at au.gov.aims.atlasmapperserver.servlet.compression.GZIPFilter.doFilter(GZIPFilter.java:61)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
        at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
What version of the product are you using? On what operating system?


Please provide any additional information below.
Windows 7, AtlasMapper 1.4.8, GeoServer 2.4.5 from windows installer, Java 
1.7.14

Original issue reported on code.google.com by eric.law...@gmail.com on 14 Mar 2014 at 5:55