Hi,
We have a web application which uses the following code to connect to a
external endpoint
QueryExecution exec =
QueryExecutionFactory.sparqlService(Config.getConfig("endpoint"),
kroQuery);
ResultSet objects = exec.execSelect();
This runs fine with Jena up to 3.1.0
However with later versions we run into the issue that after 6 requests
they don't return, upon killing the application ( or server ) this is
visible on the console:
====
WARNING - The web application [ROOT] is still processing a request that
has yet to finish. This is very likely to create a memory leak. You can
control the time allowed for requests to finish by using the unloadDelay
attribute of the standard Context implementation. Stack trace of request
processing thread:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
org.apache.http.pool.PoolEntryFuture.await(PoolEntryFuture.java:138)
org.apache.http.pool.AbstractConnPool.getPoolEntryBlocking(AbstractConnPool.java:306)
org.apache.http.pool.AbstractConnPool.access$000(AbstractConnPool.java:64)
org.apache.http.pool.AbstractConnPool$2.getPoolEntry(AbstractConnPool.java:192)
org.apache.http.pool.AbstractConnPool$2.getPoolEntry(AbstractConnPool.java:185)
org.apache.http.pool.PoolEntryFuture.get(PoolEntryFuture.java:107)
org.apache.http.impl.conn.PoolingHttpClientConnectionManager.leaseConnection(PoolingHttpClientConnectionManager.java:276)
org.apache.http.impl.conn.PoolingHttpClientConnectionManager$1.get(PoolingHttpClientConnectionManager.java:263)
org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:190)
org.apache.http.impl.client.cache.CachingExec.callBackend(CachingExec.java:592)
org.apache.http.impl.client.cache.CachingExec.handleCacheMiss(CachingExec.java:356)
org.apache.http.impl.client.cache.CachingExec.execute(CachingExec.java:275)
org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
org.apache.jena.riot.web.HttpOp.exec(HttpOp.java:1054)
org.apache.jena.riot.web.HttpOp.execHttpGet(HttpOp.java:281)
org.apache.jena.riot.web.HttpOp.execHttpGet(HttpOp.java:340)
org.apache.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:323)
org.apache.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:282)
org.apache.jena.sparql.engine.http.QueryEngineHTTP.execResultSetInner(QueryEngineHTTP.java:342)
org.apache.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:334)
webservice.KroService.getBlockAsJson(KroService.java:90)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.apache.openejb.server.cxf.rs.PojoInvoker.performInvocation(PojoInvoker.java:43)
org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96)
org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:189)
org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:99)
org.apache.openejb.server.cxf.rs.AutoJAXRSInvoker.invoke(AutoJAXRSInvoker.java:68)
org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59)
org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96)
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308)
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:252)
org.apache.openejb.server.cxf.rs.CxfRsHttpListener.doInvoke(CxfRsHttpListener.java:251)
org.apache.tomee.webservices.CXFJAXRSFilter.doFilter(CXFJAXRSFilter.java:94)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
org.apache.catalina.filters.CorsFilter.handleNonCORS(CorsFilter.java:419)
org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:169)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.tomee.catalina.OpenEJBSecurityListener$RequestCapturer.invoke(OpenEJBSecurityListener.java:97)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:748)
====
Any hint would be greatly appreciated.
Met Vriendelijke Groet / With Kind Regards
Bart van Leeuwen
twitter: @semanticfire
tel. +31(0)6-53182997
Netage B.V.
http://netage.nl
Esdoornstraat 3
3461ER Linschoten
The Netherlands
