WFS POST request without service specification causes NPE

The dispatcher assumes XML requests do always contain a service="xxx" statement, whilst it's not guaranteed for service requests that aren't conformant to the WFS xml schema.

We have to either protect against the NPE or validate the request against the schema before dispatching it (this may be problematic for big WFS Transaction request, that would suffer from the NPE as every other WFS request...)

The full stack trace is:

2007-04-30 15:13:19.171::WARN: /geoserver/wfs
java.lang.NullPointerException
at org.geoserver.request.Dispatcher.find(Dispatcher.java:84)
at org.geoserver.request.Dispatcher.post(Dispatcher.java:280)
at org.geoserver.request.Dispatcher.dispatch(Dispatcher.java:181)
at org.geoserver.request.Dispatcher.handleRequestInternal(Dispatcher.java:52)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:139)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:684)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:625)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:392)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:357)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:445)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1050)
at org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:103)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1041)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:354)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:226)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:627)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:141)
at org.mortbay.jetty.Server.handle(Server.java:269)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:430)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:701)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:617)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:199)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:339)
at org.mortbay.jetty.nio.HttpChannelEndPoint.run(HttpChannelEndPoint.java:270)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)