NullPointerException calling the explorer

[GoogleCodeExporter]

I try to follow the helloworld tutorial. When I call the explorer I get the 
following error message 
in the console:
java.lang.NullPointerException
    at 
com.xucia.resourceaccelerate.CompressAndCacheHeadersFilter.doFilter(CompressAndC
acheHead
ersFilter.java:129)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1115)
    at org.persvr.remote.PersevereFilter$DefaultHandler.call(PersevereFilter.java:547)
    at org.persvr.remote.PersevereFilter.doFilter(PersevereFilter.java:357)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1115)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:361)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
    at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollecti
on.java:230)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:324)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
    at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.ja
va:864)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
08.09.2009 08:47:21 org.persvr.remote.PersevereFilter$DefaultHandler call

The Persevere version is the 1.0 release candidate, but I get the same error 
with older Releases.
The system is MAC OSX 10.6 (Snow Leopard) with java 1.6.0_15

Original issue reported on code.google.com by dneuman...@gmail.com on 8 Sep 2009 at 7:05

[GoogleCodeExporter]

Is it possible that there is something that would restrict persevere's ability 
to write 
to the file system? Would you be willing to try the latest nightly (I just did 
a build) 
includes a change to avoid that nullpointerexception, and display the real 
error?
http://www.persvr.org/nightly/

Original comment by kris...@gmail.com on 8 Sep 2009 at 12:59

[GoogleCodeExporter]

You are right. The system didn't have  write access for the persevere folder. 
The message was:
java.io.FileNotFoundException: /opt/persevere/ra-cache/_explorer.html.gz (No 
such file or directory).
Thanks a lot
Dirk

Original comment by dneuman...@gmail.com on 8 Sep 2009 at 2:22