Hi Peter,
My guess is that for a RequestFilter, you need to ensure that your
filter is contributed after the default Tap5 filter that wires up the
HttpServletRequest object to the Tap5 Request object (which is what is
causing the NPE). However, I think on reading the RequestHandler
pipeline section of
http://tapestry.apache.org/tapestry5/tapestry-core/guide/request.html
that this is probably done as the final step in the pipeline (ie the
terminator) before passing onto the MasterDispatcher service that
processes the Dispatcher pipeline. In other words, you can't do what you
want to do.
Not done any Tap5 coding yet so I may be wrong but hopefully I have
given you a pointer.
Cheers
Richard
Peter Stavrinides wrote:
Hi,
Perhaps I haven't phrased this question quite right since I didn't get
a response... Let me try it again.
What I have is two contributions, a RequestFilter and a Dispatcher
(the code is just about identicle) both services have a dependancy on
the ApplicationStateManager, so I wire it by injecting it via the
constructor:
//contribution
public void
contributeMasterDispatcher(OrderedConfiguration<Dispatcher>
configuration,
@InjectService("AccessController") Dispatcher
accessController) {
configuration.add("AccessController", accessController,
"before:PageRender");
}
//constructor
public AccessController(ApplicationStateManager asm){
this.asm_ = asm;
}
The Dispatcher seems to work perfectly, this simple test:
if(asm_.exists(UserAsoObject.class))
returns true/false, my state manager is working, however for the
RequestFilter, with virtually identical code, the same test returns a
NPE instead. I just wan't to understand where I am going wrong.
Thanks again,
Peter
Peter Stavrinides wrote:
Hi All,
I can get hold of the ApplicationStateManager using the Dispatcher
interface without a problem, however the same code fails using the
Tapestry RequestFilter interface? specifically
*if(asm_.exists(**UserAsoObject.class)**)) *returns a NPE. Would this
be a bug or shouldn't I be using it here in this way?
public class AccessController implements RequestFilter {
/* Our state manager. */
private ApplicationStateManager asm_;
public AccessController(ApplicationStateManager asm){
this.asm_ = asm;
}
@Override
public boolean service(Request request, Response response,
RequestHandler handler)
throws IOException {
*if(asm_.exists(UserAsoObject.class)) {*
UserAsoObject userObject =
asm_.get(UserAsoObject.class);
}
return handler.service(request,response);
}
produced the following stack trace:
java.lang.NullPointerException
at $Request_116a49796f3.getContextPath($Request_116a49796f3.java)
at $Request_116a49796d5.getContextPath($Request_116a49796d5.java)
at
org.apache.tapestry.internal.services.ClasspathAssetAliasManagerImpl.toClientURL(ClasspathAssetAliasManagerImpl.java:90)
at
$ClasspathAssetAliasManager_116a4979724.toClientURL($ClasspathAssetAliasManager_116a4979724.java)
at
org.apache.tapestry.internal.services.ClasspathAssetFactory.buildClientURL(ClasspathAssetFactory.java:84)
at
org.apache.tapestry.internal.services.ClasspathAssetFactory.clientURL(ClasspathAssetFactory.java:59)
at
org.apache.tapestry.internal.services.ClasspathAssetFactory.access$000(ClasspathAssetFactory.java:33)
at
org.apache.tapestry.internal.services.ClasspathAssetFactory$1.toClientURL(ClasspathAssetFactory.java:102)
at
org.apache.tapestry.internal.services.PageRenderSupportImpl.addStylesheetLink(PageRenderSupportImpl.java:109)
at
org.apache.tapestry.services.TapestryModule$17.renderMarkup(TapestryModule.java:1322)
at
$MarkupRenderer_116a4979727.renderMarkup($MarkupRenderer_116a4979727.java)
at
org.apache.tapestry.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:64)
at
$PageMarkupRenderer_116a497971d.renderPageMarkup($PageMarkupRenderer_116a497971d.java)
at
org.apache.tapestry.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:56)
at
$PageResponseRenderer_116a49796f4.renderPageResponse($PageResponseRenderer_116a49796f4.java)
at
org.apache.tapestry.internal.services.DefaultRequestExceptionHandler.handleRequestException(DefaultRequestExceptionHandler.java:60)
at
$RequestExceptionHandler_116a49796e7.handleRequestException($RequestExceptionHandler_116a49796e7.java)
at
org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:536)
at
$RequestHandler_116a49796ec.service($RequestHandler_116a49796ec.java)
at
org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
at
$RequestHandler_116a49796ec.service($RequestHandler_116a49796ec.java)
at
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:94)
at
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:85)
at
org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
at
org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:107)
at
$RequestHandler_116a49796ec.service($RequestHandler_116a49796ec.java)
at
$RequestHandler_116a49796e4.service($RequestHandler_116a49796e4.java)
at
org.apache.tapestry.services.TapestryModule$11.service(TapestryModule.java:921)
at
$HttpServletRequestHandler_116a49796e3.service($HttpServletRequestHandler_116a49796e3.java)
at
org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:164)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
at
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:406)
at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
at
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:295)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:503)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:827)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:511)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:210)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:379)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:361)
at
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
Here is the contribution:
/**
public void
contributeRequestHandler(OrderedConfiguration<RequestFilter>
configuration,
@InjectService("TimingFilter") RequestFilter filter,
@InjectService("AccessController") RequestFilter accessController) {
configuration.add("Timing", filter);
configuration.add("AccessController", accessController,
"before:PageRender");
}
Kind regards,
Peter
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