Problem when using RSS Reader

0
I'm trying to use the module RSS Reader but got this error.   Any idea of my mistake ?   com.mendix.webui.WebUIException: Exception while executing runtime operation    at com.mendix.webui.actions.client.RuntimeOperationAction.$anonfun$apply$3(RuntimeOperationAction.scala:60) Caused by: com.mendix.modules.microflowengine.MicroflowException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.RuntimeException: java.net.UnknownHostException: www.catnat.net    at RSSReader.ReedRSS (JavaAction : 'Reed RSS')    at MyFirstModule.ReedRSS (SubMicroflow : 'Reed RSS') Advanced stacktrace:    at com.mendix.modules.microflowengine.MicroflowUtil$.processException(MicroflowUtil.scala:73) Caused by: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.RuntimeException: java.net.UnknownHostException: www.catnat.net    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:125) Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.RuntimeException: java.net.UnknownHostException: www.catnat.net    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:23) Caused by: java.lang.RuntimeException: java.net.UnknownHostException: www.catnat.net    at rssreader.helpers.RSSFeedParser.read(RSSFeedParser.java:165)    at rssreader.helpers.RSSFeedParser.readFeed(RSSFeedParser.java:64)    at rssreader.actions.ReedRSSPrivate.executeAction(ReedRSSPrivate.java:45)    at rssreader.actions.ReedRSSPrivate.executeAction(ReedRSSPrivate.java:22)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:73)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:66)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:122)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:122)    at com.mendix.basis.actionmanagement.UserActionCallBuilderImpl.execute(UserActionCallBuilderImpl.scala:58)    at com.mendix.modules.microflowengine.actions.actioncall.ForegroundJavaAction.doExecute(ForegroundJavaAction.scala:35)    at com.mendix.modules.microflowengine.actions.actioncall.ForegroundJavaAction.doExecute(ForegroundJavaAction.scala:11)    at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:38)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.$anonfun$execute$1(MicroflowObject.scala:29)    at scala.Option.flatMap(Option.scala:283)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.scala:26)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.scala:198)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeMicroflow(MicroflowImpl.scala:131)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.$anonfun$executeAction$1(MicroflowImpl.scala:111)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$withSpan$1(OpenTelemetryUtil.scala:16)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$usingSpanWithCustomStatus$2(OpenTelemetryUtil.scala:20)    at scala.util.Using$.apply(Using.scala:296)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:19)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:36)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpanWithCustomStatus(OpenTelemetryUtil.scala:13)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpan(OpenTelemetryUtil.scala:16)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.scala:109)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:73)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:66)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:122)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:122)    at com.mendix.basis.component.ExecutionCore.doExecuteSync(ExecutionCore.scala:149)    at com.mendix.basis.component.ExecutionCore.doExecuteSync$(ExecutionCore.scala:148)    at com.mendix.basis.component.InternalCore.doExecuteSync(InternalCore.scala:24)    at com.mendix.basis.component.ExecutionCore.executeSync(ExecutionCore.scala:98)    at com.mendix.basis.component.ExecutionCore.executeSync$(ExecutionCore.scala:95)    at com.mendix.basis.component.InternalCore.executeSync(InternalCore.scala:24)    at com.mendix.modules.microflowengine.MicroflowExecuter$.executeSync(MicroflowExecuter.scala:19)    at com.mendix.modules.microflowengine.actions.SubMicroflowAction.execute(SubMicroflowAction.scala:36)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.$anonfun$execute$1(MicroflowObject.scala:29)    at scala.Option.flatMap(Option.scala:283)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.scala:26)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.scala:198)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeMicroflow(MicroflowImpl.scala:131)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.$anonfun$executeAction$1(MicroflowImpl.scala:111)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$withSpan$1(OpenTelemetryUtil.scala:16)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$usingSpanWithCustomStatus$2(OpenTelemetryUtil.scala:20)    at scala.util.Using$.apply(Using.scala:296)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:19)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:36)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpanWithCustomStatus(OpenTelemetryUtil.scala:13)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpan(OpenTelemetryUtil.scala:16)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.scala:109)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:73)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:66)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:122)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:122)    at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:63)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.runMicroflow(MicroflowRuntimeOperationExecutor.scala:103)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.$anonfun$doApply$6(MicroflowRuntimeOperationExecutor.scala:76)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:30)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$1(RegularClientAction.scala:72)    at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:46)    at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:43)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:66)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:70)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:66)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.doApply(MicroflowRuntimeOperationExecutor.scala:77)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.apply(MicroflowRuntimeOperationExecutor.scala:47)    at com.mendix.webui.actions.client.RuntimeOperationAction.runOperation(RuntimeOperationAction.scala:81)    at com.mendix.webui.actions.client.RuntimeOperationAction.$anonfun$apply$3(RuntimeOperationAction.scala:57)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$withSpan$1(OpenTelemetryUtil.scala:16)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$usingSpanWithCustomStatus$2(OpenTelemetryUtil.scala:20)    at scala.util.Using$.apply(Using.scala:296)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:19)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:36)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpanWithCustomStatus(OpenTelemetryUtil.scala:13)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpan(OpenTelemetryUtil.scala:16)    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:54)    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:26)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:30)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:121)    at scala.util.Try$.apply(Try.scala:217)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:121)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:119)    at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$6(ContextHandling.scala:59)    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)    at com.mendix.basis.actionmanagement.ActionMonitoring$.$anonfun$monitor$1(ActionMonitoring.scala:52)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionMonitoring$.monitor(ActionMonitoring.scala:52)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:59)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:33)    at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:95)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:30)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:22)    at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:95)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:119)    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)    at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14)    at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10)    at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:95)    at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:116)    at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:101)    at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:72)    at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:37)    at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$2(MxRuntimeConnector.scala:58)    at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$2$adapted(MxRuntimeConnector.scala:58)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.scala:58)    at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.scala:1077)    at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:40)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)    at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)    at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1384)    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1306)    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)    at org.eclipse.jetty.server.Server.handle(Server.java:563)    at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)    at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)    at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)    at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: java.net.UnknownHostException: www.catnat.net    at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:567)    at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327)    at java.base/java.net.Socket.connect(Socket.java:751)    at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:304)    at java.base/sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:181)    at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:183)    at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:531)    at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:636)    at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)    at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:377)    at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:193)    at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1252)    at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1138)    at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:179)    at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1690)    at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1614)    at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:223)    at java.base/java.net.URL.openStream(URL.java:1325)    at rssreader.helpers.RSSFeedParser.read(RSSFeedParser.java:163)    at rssreader.helpers.RSSFeedParser.readFeed(RSSFeedParser.java:64)    at rssreader.actions.ReedRSSPrivate.executeAction(ReedRSSPrivate.java:45)    at rssreader.actions.ReedRSSPrivate.executeAction(ReedRSSPrivate.java:22)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:73)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:66)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:122)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:122)    at com.mendix.basis.actionmanagement.UserActionCallBuilderImpl.execute(UserActionCallBuilderImpl.scala:58)    at com.mendix.modules.microflowengine.actions.actioncall.ForegroundJavaAction.doExecute(ForegroundJavaAction.scala:35)    at com.mendix.modules.microflowengine.actions.actioncall.ForegroundJavaAction.doExecute(ForegroundJavaAction.scala:11)    at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:38)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.$anonfun$execute$1(MicroflowObject.scala:29)    at scala.Option.flatMap(Option.scala:283)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.scala:26)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.scala:198)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeMicroflow(MicroflowImpl.scala:131)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.$anonfun$executeAction$1(MicroflowImpl.scala:111)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$withSpan$1(OpenTelemetryUtil.scala:16)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$usingSpanWithCustomStatus$2(OpenTelemetryUtil.scala:20)    at scala.util.Using$.apply(Using.scala:296)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:19)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:36)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpanWithCustomStatus(OpenTelemetryUtil.scala:13)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpan(OpenTelemetryUtil.scala:16)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.scala:109)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:73)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:66)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:122)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:122)    at com.mendix.basis.component.ExecutionCore.doExecuteSync(ExecutionCore.scala:149)    at com.mendix.basis.component.ExecutionCore.doExecuteSync$(ExecutionCore.scala:148)    at com.mendix.basis.component.InternalCore.doExecuteSync(InternalCore.scala:24)    at com.mendix.basis.component.ExecutionCore.executeSync(ExecutionCore.scala:98)    at com.mendix.basis.component.ExecutionCore.executeSync$(ExecutionCore.scala:95)    at com.mendix.basis.component.InternalCore.executeSync(InternalCore.scala:24)    at com.mendix.modules.microflowengine.MicroflowExecuter$.executeSync(MicroflowExecuter.scala:19)    at com.mendix.modules.microflowengine.actions.SubMicroflowAction.execute(SubMicroflowAction.scala:36)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.$anonfun$execute$1(MicroflowObject.scala:29)    at scala.Option.flatMap(Option.scala:283)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.scala:26)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.scala:198)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeMicroflow(MicroflowImpl.scala:131)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.$anonfun$executeAction$1(MicroflowImpl.scala:111)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$withSpan$1(OpenTelemetryUtil.scala:16)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$usingSpanWithCustomStatus$2(OpenTelemetryUtil.scala:20)    at scala.util.Using$.apply(Using.scala:296)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:19)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:36)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpanWithCustomStatus(OpenTelemetryUtil.scala:13)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpan(OpenTelemetryUtil.scala:16)    at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.scala:109)    at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:73)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71)    at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:48)    at com.mendix.core.actionmanagement.internal.InternalCoreAction.call(InternalCoreAction.java:66)    at com.mendix.basis.actionmanagement.ActionManager.$anonfun$executeSync$2(ActionManager.scala:122)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionManager.executeSync(ActionManager.scala:122)    at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:63)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.runMicroflow(MicroflowRuntimeOperationExecutor.scala:103)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.$anonfun$doApply$6(MicroflowRuntimeOperationExecutor.scala:76)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:30)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$1(RegularClientAction.scala:72)    at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:46)    at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:43)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:66)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:70)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:66)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.doApply(MicroflowRuntimeOperationExecutor.scala:77)    at com.mendix.webui.actions.client.MicroflowRuntimeOperationExecutor.apply(MicroflowRuntimeOperationExecutor.scala:47)    at com.mendix.webui.actions.client.RuntimeOperationAction.runOperation(RuntimeOperationAction.scala:81)    at com.mendix.webui.actions.client.RuntimeOperationAction.$anonfun$apply$3(RuntimeOperationAction.scala:57)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$withSpan$1(OpenTelemetryUtil.scala:16)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.$anonfun$usingSpanWithCustomStatus$2(OpenTelemetryUtil.scala:20)    at scala.util.Using$.apply(Using.scala:296)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:19)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.usingSpanWithCustomStatus(OpenTelemetryUtil.scala:36)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpanWithCustomStatus(OpenTelemetryUtil.scala:13)    at com.mendix.modules.opentelemetry.OpenTelemetryUtil$.withSpan(OpenTelemetryUtil.scala:16)    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:54)    at com.mendix.webui.actions.client.RuntimeOperationAction.apply(RuntimeOperationAction.scala:26)    at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:30)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:121)    at scala.util.Try$.apply(Try.scala:217)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:121)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:119)    at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$6(ContextHandling.scala:59)    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)    at com.mendix.basis.actionmanagement.ActionMonitoring$.$anonfun$monitor$1(ActionMonitoring.scala:52)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.basis.actionmanagement.ActionMonitoring$.monitor(ActionMonitoring.scala:52)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:59)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:33)    at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:95)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:30)    at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:22)    at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:95)    at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:119)    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)    at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14)    at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10)    at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:95)    at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:116)    at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:101)    at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:72)    at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:37)    at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$2(MxRuntimeConnector.scala:58)    at com.mendix.external.connector.MxRuntimeConnector.$anonfun$processRequest$2$adapted(MxRuntimeConnector.scala:58)    at com.mendix.util.classloading.Runner$.withContextClassLoader(Runner.scala:20)    at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.scala:58)    at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.scala:1077)    at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.scala:40)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)    at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)    at org.eclipse.jetty.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:170)    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1384)    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1306)    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)    at org.eclipse.jetty.server.Server.handle(Server.java:563)    at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)    at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)    at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)    at java.base/java.lang.Thread.run(Thread.java:1583)
asked
2 answers
1

You are trying to read an RSS feed from a site called www.catnat.net which doesn't seem to exist. Try an RSS feed from another site you know works. An example could be the headlines from BBC news.

https://feeds.bbci.co.uk/news/rss.xml?edition=uk

 

I hope this helps.

answered
1

Hi Jocelyn,

 

The error reads "UnknownHostException", which means that the Host or IP could not be resolved.

When I try to visit www.catnat.net, it took the browser quite some time to load the page; I guess the host is not too stable.

You could alert the website owner about this issue, but not much more. For your part, you could build retry mechnisms (if it fails, try again for maximum of 3 trials).

Good luck!

answered