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Error suggesting/retrieving 'types' for reconcile #111

Open
ostephens opened this issue Jun 17, 2015 · 1 comment
Open

Error suggesting/retrieving 'types' for reconcile #111

ostephens opened this issue Jun 17, 2015 · 1 comment

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@ostephens
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When trying to use the Getty SPARQL endpoint http://vocab.getty.edu/sparql for reconciliation, at the point where the extension attempts to suggest possible entity types to reconcile against there is an error. Looking at the javascript console, the 'guess-types-of-column' request returns the following error:

{
    {
        "message": "<html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n<title>Error 500 Butterfly Error\nButterfly caught the following error while processing the request:\njava.lang.NullPointerException
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getNamespaceEndPosition(GRefineJsonUtilitiesImpl.java:245)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResultItem(GRefineJsonUtilitiesImpl.java:227)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResponse(GRefineJsonUtilitiesImpl.java:208)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getMultipleResponse(GRefineJsonUtilitiesImpl.java:119)
    at org.deri.grefine.reconcile.ServiceRegistry.multiReconcile(ServiceRegistry.java:118)
    at org.deri.grefine.reconcile.GRefineServiceManager.multiReconcile(GRefineServiceManager.java:94)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
    at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:247)
    at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
    at org.mozilla.javascript.gen.c4._c5(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js:224)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.process(ButterflyModuleImpl.java:399)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.run(ButterflyModuleImpl.java:377)
    at org.mozilla.javascript.Context.call(Context.java:515)
    at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:507)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.processScript(ButterflyModuleImpl.java:650)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.process(ButterflyModuleImpl.java:427)
    at edu.mit.simile.butterfly.Butterfly.service(Butterfly.java:516)
    at com.google.refine.RefineServlet.service(RefineServlet.java:200)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
    at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:155)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)\n<\/title>\n<\/head>\n<body><h2>HTTP ERROR 500<\/h2>\n<p>Problem accessing /extension/rdf-extension/services/getty-rdfs. Reason:\n<pre>    Butterfly Error\nButterfly caught the following error while processing the request:\njava.lang.NullPointerException
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getNamespaceEndPosition(GRefineJsonUtilitiesImpl.java:245)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResultItem(GRefineJsonUtilitiesImpl.java:227)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResponse(GRefineJsonUtilitiesImpl.java:208)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getMultipleResponse(GRefineJsonUtilitiesImpl.java:119)
    at org.deri.grefine.reconcile.ServiceRegistry.multiReconcile(ServiceRegistry.java:118)
    at org.deri.grefine.reconcile.GRefineServiceManager.multiReconcile(GRefineServiceManager.java:94)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
    at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:247)
    at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
    at org.mozilla.javascript.gen.c4._c5(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js:224)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.process(ButterflyModuleImpl.java:399)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.run(ButterflyModuleImpl.java:377)
    at org.mozilla.javascript.Context.call(Context.java:515)
    at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:507)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.processScript(ButterflyModuleImpl.java:650)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.process(ButterflyModuleImpl.java:427)
    at edu.mit.simile.butterfly.Butterfly.service(Butterfly.java:516)
    at com.google.refine.RefineServlet.service(RefineServlet.java:200)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
    at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:155)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)\n<\/pre><\/p><hr /><i><small>Powered by Jetty://<\/small><\/i><br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n\n<\/body>\n<\/html>\n",
        "code": "error",
        "stack": "java.io.IOException: <html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n<title>Error 500 Butterfly Error\nButterfly caught the following error while processing the request:\njava.lang.NullPointerException
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getNamespaceEndPosition(GRefineJsonUtilitiesImpl.java:245)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResultItem(GRefineJsonUtilitiesImpl.java:227)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResponse(GRefineJsonUtilitiesImpl.java:208)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getMultipleResponse(GRefineJsonUtilitiesImpl.java:119)
    at org.deri.grefine.reconcile.ServiceRegistry.multiReconcile(ServiceRegistry.java:118)
    at org.deri.grefine.reconcile.GRefineServiceManager.multiReconcile(GRefineServiceManager.java:94)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
    at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:247)
    at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
    at org.mozilla.javascript.gen.c4._c5(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js:224)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.process(ButterflyModuleImpl.java:399)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.run(ButterflyModuleImpl.java:377)
    at org.mozilla.javascript.Context.call(Context.java:515)
    at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:507)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.processScript(ButterflyModuleImpl.java:650)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.process(ButterflyModuleImpl.java:427)
    at edu.mit.simile.butterfly.Butterfly.service(Butterfly.java:516)
    at com.google.refine.RefineServlet.service(RefineServlet.java:200)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
    at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:155)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)\n<\/title>\n<\/head>\n<body><h2>HTTP ERROR 500<\/h2>\n<p>Problem accessing /extension/rdf-extension/services/getty-rdfs. Reason:\n<pre>    Butterfly Error\nButterfly caught the following error while processing the request:\njava.lang.NullPointerException
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getNamespaceEndPosition(GRefineJsonUtilitiesImpl.java:245)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResultItem(GRefineJsonUtilitiesImpl.java:227)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getResponse(GRefineJsonUtilitiesImpl.java:208)
    at org.deri.grefine.reconcile.util.GRefineJsonUtilitiesImpl.getMultipleResponse(GRefineJsonUtilitiesImpl.java:119)
    at org.deri.grefine.reconcile.ServiceRegistry.multiReconcile(ServiceRegistry.java:118)
    at org.deri.grefine.reconcile.GRefineServiceManager.multiReconcile(GRefineServiceManager.java:94)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
    at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:247)
    at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
    at org.mozilla.javascript.gen.c4._c5(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js:224)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
    at org.mozilla.javascript.gen.c4.call(file:/Applications/OpenRefine.app/Contents/Resource/webapp/extensions/rdf-extension/module/MOD-INF/controller.js)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.process(ButterflyModuleImpl.java:399)
    at edu.mit.simile.butterfly.ButterflyModuleImpl$Controller.run(ButterflyModuleImpl.java:377)
    at org.mozilla.javascript.Context.call(Context.java:515)
    at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:507)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.processScript(ButterflyModuleImpl.java:650)
    at edu.mit.simile.butterfly.ButterflyModuleImpl.process(ButterflyModuleImpl.java:427)
    at edu.mit.simile.butterfly.Butterfly.service(Butterfly.java:516)
    at com.google.refine.RefineServlet.service(RefineServlet.java:200)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
    at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:155)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)\n<\/pre><\/p><hr /><i><small>Powered by Jetty://<\/small><\/i><br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n\n<\/body>\n<\/html>\n
    at com.google.refine.commands.recon.GuessTypesOfColumnCommand.guessTypes(GuessTypesOfColumnCommand.java:189)
    at com.google.refine.commands.recon.GuessTypesOfColumnCommand.doPost(GuessTypesOfColumnCommand.java:89)
    at com.google.refine.RefineServlet.service(RefineServlet.java:177)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
    at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:132)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)\n"
    }

This results in the browser interface hanging with the 'Working ...' overlay showing. The only way to exit this is to refresh the page.
@tfmorris
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Thanks for the report. Looks like there might be two bugs here:

  1. The underlying server-side NPE
  2. The inability of the client side to deal with what appears to be a well-formed error message

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@tfmorris @ostephens