Need to do a better job of handling errors throw when DB connectivity is lost.

At present, it seems that Crowd will look for the GZip filter property in the database first, which, when not found, throws this nasty exception:

ERROR [xfire.transport.http.XFireServletController] Couldn't invoke servlet request.
org.codehaus.xfire.XFireRuntimeException: Couldn't parse stream.. Nested exception is com.ctc.wstx.exc.WstxIOException: Connection reset
com.ctc.wstx.exc.WstxIOException: Connection reset
at com.ctc.wstx.stax.WstxInputFactory.doCreateSR(WstxInputFactory.java:548)
at com.ctc.wstx.stax.WstxInputFactory.createSR(WstxInputFactory.java:604)
at com.ctc.wstx.stax.WstxInputFactory.createSR(WstxInputFactory.java:629)
at com.ctc.wstx.stax.WstxInputFactory.createXMLStreamReader(WstxInputFactory.java:324)
at org.codehaus.xfire.util.STAXUtils.createXMLStreamReader(STAXUtils.java:762)
at org.codehaus.xfire.transport.http.XFireServletController.invoke(XFireServletController.java:297)
at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:129)
at org.codehaus.xfire.transport.http.XFireServlet.doPost(XFireServlet.java:116)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at com.atlassian.crowd.console.filter.CrowdOpenSessionInViewFilter.doFilterInternal(CrowdOpenSessionInViewFilter.java:26)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.atlassian.gzipfilter.GzipFilter.doFilterInternal(GzipFilter.java:88)
at com.atlassian.gzipfilter.GzipFilter.doFilter(GzipFilter.java:64)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)
at com.atlassian.crowd.console.filter.CrowdDelegatingFilterProxy.doFilter(CrowdDelegatingFilterProxy.java:38)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.atlassian.johnson.filters.AbstractJohnsonFilter.doFilter(AbstractJohnsonFilter.java:72)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.atlassian.johnson.filters.AbstractJohnsonFilter.doFilter(AbstractJohnsonFilter.java:72)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:748)
at org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:778)
at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:116)
at org.apache.coyote.http11.InternalInputBuffer.doRead(InternalInputBuffer.java:713)
at org.apache.coyote.Request.doRead(Request.java:419)
at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:265)
at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:403)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:280)
at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:162)
at com.ctc.wstx.io.UTF8Reader.loadMore(UTF8Reader.java:365)
at com.ctc.wstx.io.UTF8Reader.read(UTF8Reader.java:110)
at com.ctc.wstx.io.ReaderBootstrapper.initialLoad(ReaderBootstrapper.java:245)
at com.ctc.wstx.io.ReaderBootstrapper.bootstrapInput(ReaderBootstrapper.java:132)
at com.ctc.wstx.stax.WstxInputFactory.doCreateSR(WstxInputFactory.java:543)