[jira] [Commented] (STANBOL-147) NamedEntityExtractionEnhancementEngine is not thread safe

["Olivier Grisel (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/STANBOL-147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016312#comment-13016312 ] 

Olivier Grisel commented on STANBOL-147:
----------------------------------------

Here is the stack trace:

org.apache.stanbol.enhancer.servicesapi.EngineException: 'NamedEntityExtractionEnhancementEngine' failed to process content item 'urn:content-item-sha1-f02f7417dc27e8ee38a2ae950b3d50523db2e5e6' with type 'text/plain': null
	at org.apache.stanbol.enhancer.engines.opennlp.impl.NamedEntityExtractionEnhancementEngine.computeEnhancements(NamedEntityExtractionEnhancementEngine.java:180)
	at org.apache.stanbol.enhancer.jobmanager.impl.InMemoryJobManager.enhanceContent(InMemoryJobManager.java:62)
	at org.apache.stanbol.enhancer.jersey.resource.EnginesRootResource.enhanceAndBuildResponse(EnginesRootResource.java:163)
	at org.apache.stanbol.enhancer.jersey.resource.EnginesRootResource.enhanceFromData(EnginesRootResource.java:155)
	at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:172)
	at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
	at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:265)
	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:83)
	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:133)
	at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:71)
	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:996)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:947)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:938)
	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:399)
	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:478)
	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:663)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.apache.felix.http.base.internal.handler.ServletHandler.doHandle(ServletHandler.java:96)
	at org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:79)
	at org.apache.felix.http.base.internal.dispatch.ServletPipeline.handle(ServletPipeline.java:42)
	at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:49)
	at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
	at org.apache.felix.http.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:48)
	at org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:39)
	at org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:67)
	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.handle(ServletHandler.java:390)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
	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:943)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.NullPointerException
	at opennlp.tools.util.Cache.put(Cache.java:134)
	at opennlp.tools.util.featuregen.CachedFeatureGenerator.createFeatures(CachedFeatureGenerator.java:71)
	at opennlp.tools.namefind.DefaultNameContextGenerator.getContext(DefaultNameContextGenerator.java:116)
	at opennlp.tools.namefind.DefaultNameContextGenerator.getContext(DefaultNameContextGenerator.java:39)
	at opennlp.tools.util.BeamSearch.bestSequences(BeamSearch.java:125)
	at opennlp.tools.util.BeamSearch.bestSequence(BeamSearch.java:198)
	at opennlp.tools.namefind.NameFinderME.find(NameFinderME.java:214)
	at opennlp.tools.namefind.NameFinderME.find(NameFinderME.java:198)
	at org.apache.stanbol.enhancer.engines.opennlp.impl.NamedEntityExtractionEnhancementEngine.extractNameOccurrences(NamedEntityExtractionEnhancementEngine.java:318)
	at org.apache.stanbol.enhancer.engines.opennlp.impl.NamedEntityExtractionEnhancementEngine.findNamedEntities(NamedEntityExtractionEnhancementEngine.java:199)
	at org.apache.stanbol.enhancer.engines.opennlp.impl.NamedEntityExtractionEnhancementEngine.computeEnhancements(NamedEntityExtractionEnhancementEngine.java:177)
	... 41 more


> NamedEntityExtractionEnhancementEngine is not thread safe
> ---------------------------------------------------------
>
>                 Key: STANBOL-147
>                 URL: https://issues.apache.org/jira/browse/STANBOL-147
>             Project: Stanbol
>          Issue Type: Bug
>            Reporter: Olivier Grisel
>            Assignee: Olivier Grisel
>
> Under high concurrency, using the same mode instances in several threads can trigger NPEs. One should put the models into thread locals instead.

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