Stanbol Home

The RESTful Semantic Engine

Topic Classification

Registered models and training datasets used by the Topic Classification Enhancement Engine.

Topic ModelEnhancement ChainsTraining Set
dbpedia-category-model (TopicClassificationEngine)
    get(chainNames) failed on instance of org.apache.stanbol.enhancer.engine.topic.TopicClassificationEngine The problematic instruction: ---------- ==> list classifier.chainNames as chainName [on line 38, column 10 in html/org/apache/stanbol/enhancer/web/topic/resource/TopicClassifierRootResource/index] in user-directive common.page [on line 19, column 1 in html/org/apache/stanbol/enhancer/web/topic/resource/TopicClassifierRootResource/index] ---------- Java backtrace for programmers: ---------- freemarker.template.TemplateModelException: get(chainNames) failed on instance of org.apache.stanbol.enhancer.engine.topic.TopicClassificationEngine at freemarker.ext.beans.BeanModel.get(BeanModel.java:224) at freemarker.core.Dot._getAsTemplateModel(Dot.java:76) at freemarker.core.Expression.getAsTemplateModel(Expression.java:89) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179) at freemarker.core.Environment.visit(Environment.java:428) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.Environment.visit(Environment.java:406) at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.Macro$Context.runMacro(Macro.java:172) at freemarker.core.Environment.visit(Environment.java:614) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.EscapeBlock.accept(EscapeBlock.java:84) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:221) at freemarker.core.Environment.process(Environment.java:199) at freemarker.template.Template.process(Template.java:259) at org.apache.stanbol.commons.viewable.writer.impl.ViewableWriter.renderPojo(ViewableWriter.java:90) at org.apache.stanbol.commons.viewable.writer.impl.ViewableWriter.writeTo(ViewableWriter.java:74) at org.apache.stanbol.commons.viewable.writer.impl.ViewableWriter.writeTo(ViewableWriter.java:43) at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302) at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.felix.http.base.internal.handler.ServletHandler.doHandle(ServletHandler.java:339) at org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:300) at org.apache.felix.http.base.internal.dispatch.ServletPipeline.handle(ServletPipeline.java:93) at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:50) at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:31) at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:84) at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:46) at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:31) at org.apache.stanbol.commons.httpqueryheaders.impl.QueryHeadersFilter.doFilter(QueryHeadersFilter.java:84) at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:108) at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:80) at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:46) at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:31) at org.apache.stanbol.commons.web.resources.ResourceServingFilter.doFilterHttp(ResourceServingFilter.java:148) at org.apache.stanbol.commons.web.resources.ResourceServingFilter.doFilter(ResourceServingFilter.java:91) at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:108) at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:80) at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:46) at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:31) at org.apache.stanbol.commons.security.auth.AuthenticatingFilter$1.run(AuthenticatingFilter.java:163) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:536) at org.apache.stanbol.commons.security.auth.AuthenticatingFilter.doFilter(AuthenticatingFilter.java:159) at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:108) at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:80) at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:46) at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:31) at org.apache.felix.http.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:76) at org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:49) at org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:67) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.reflect.InvocationTargetException 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 freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:866) at freemarker.ext.beans.BeanModel.invokeThroughDescriptor(BeanModel.java:277) at freemarker.ext.beans.BeanModel.get(BeanModel.java:184) ... 91 more Caused by: java.lang.NullPointerException at org.apache.stanbol.enhancer.engine.topic.TopicClassificationEngine.getChainNames(TopicClassificationEngine.java:1500) ... 98 more