Virtuoso Communications Link Failure (timeout) : Connection reset

Error
message:

virtuoso.jdbc4.VirtuosoException: Virtuoso Communications Link Failure (timeout) : Connection reset
stack trace:

virtuoso.jdbc4.VirtuosoException: Virtuoso Communications Link Failure (timeout) : Connection reset
      at virtuoso.jdbc4.VirtuosoFuture.nextResult(VirtuosoFuture.java:162)
      at virtuoso.jdbc4.VirtuosoConnection.connect(VirtuosoConnection.java:622)
      at virtuoso.jdbc4.VirtuosoConnection.connect(VirtuosoConnection.java:445)
      at virtuoso.jdbc4.VirtuosoConnection.<init>(VirtuosoConnection.java:371)
      at virtuoso.jdbc4.Driver.connect(Driver.java:161)
      at org.apache.commons.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:53)
      at org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:291)
      at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:861)
      at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
      at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
      at org.apache.commons.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:134)
      at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1563)
      at eionet.cr.util.sesame.SesameConnectionProvider.getRepositoryConnection(SesameConnectionProvider.java:149)
      at eionet.cr.util.sesame.SesameUtil.getRepositoryConnection(SesameUtil.java:68)
      at eionet.cr.dao.virtuoso.VirtuosoBaseDAO.executeSPARQL(VirtuosoBaseDAO.java:104)
      at eionet.cr.dao.virtuoso.VirtuosoSearchDAO.searchByFreeText(VirtuosoSearchDAO.java:120)
      at eionet.cr.web.action.SimpleSearchActionBean.search(SimpleSearchActionBean.java:129)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at net.sourceforge.stripes.controller.DispatcherHelper$6.intercept(DispatcherHelper.java:456)
      at net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:158)
      at eionet.cr.web.interceptor.ActionEventInterceptor.intercept(ActionEventInterceptor.java:104)
      at net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:155)
      at net.sourceforge.stripes.controller.BeforeAfterMethodInterceptor.intercept(BeforeAfterMethodInterceptor.java:113)
      at net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:155)
      at net.sourceforge.stripes.controller.ExecutionContext.wrap(ExecutionContext.java:74)
      at net.sourceforge.stripes.controller.DispatcherHelper.invokeEventHandler(DispatcherHelper.java:454)
      at net.sourceforge.stripes.controller.DispatcherServlet.invokeEventHandler(DispatcherServlet.java:278)
      at net.sourceforge.stripes.controller.DispatcherServlet.service(DispatcherServlet.java:160)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at net.sourceforge.stripes.controller.StripesFilter.doFilter(StripesFilter.java:260)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
      at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      at java.lang.Thread.run(Thread.java:748)