[jboss-jira] [JBoss JIRA] (WFLY-13447) Undertow request failure happens due to "IllegalArgumentException: Comparison method violates its general contract!" when many filter-ref are defined

Undertow request failure happens due to "IllegalArgumentException: Comparison method violates its general contract!" when many filter-ref are defined ----------------------------------------------------------------------------------------------------------------------------------------------------- Key: WFLY-13447 URL: https://issues.redhat.com/browse/WFLY-13447 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 19.1.0.Final Reporter: Masafumi Miura Assignee: Flavia Rainone Priority: Major Attachments: generate-cli.sh, test.cli When many filter-ref are defined (theoretically more than 32 filter-ref are defined), Undertow has a possibility fail to process a request with the following ERROR: {code} ERROR [io.undertow.request] (default I/O-12) UT005071: Undertow request failed HttpServerExchange{ GET /}: java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.TimSort.mergeLo(TimSort.java:777) at java.util.TimSort.mergeAt(TimSort.java:514) at java.util.TimSort.mergeCollapse(TimSort.java:441) at java.util.TimSort.sort(TimSort.java:245) at java.util.Arrays.sort(Arrays.java:1512) at java.util.ArrayList.sort(ArrayList.java:1462) at org.wildfly.extension.undertow.LocationService.configureHandlerChain(LocationService.java:93) at org.wildfly.extension.undertow.Host.configureRootHandler(Host.java:174) at org.wildfly.extension.undertow.Host.getOrCreateRootHandler(Host.java:263) at org.wildfly.extension.undertow.Host$HostRootHandler.handleRequest(Host.java:430) at io.undertow.server.handlers.NameVirtualHostHandler.handleRequest(NameVirtualHostHandler.java:54) at io.undertow.server.handlers.error.SimpleErrorPageHandler.handleRequest(SimpleErrorPageHandler.java:78) at io.undertow.server.handlers.CanonicalPathHandler.handleRequest(CanonicalPathHandler.java:49) at org.wildfly.extension.undertow.Server$DefaultHostHandler.handleRequest(Server.java:190) at io.undertow.server.handlers.ChannelUpgradeHandler.handleRequest(ChannelUpgradeHandler.java:211) at io.undertow.server.protocol.http2.Http2UpgradeHandler.handleRequest(Http2UpgradeHandler.java:102) at io.undertow.server.handlers.DisallowedMethodsHandler.handleRequest(DisallowedMethodsHandler.java:61) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:370) at io.undertow.server.protocol.http.HttpReadListener.handleEventWithNoRunningRequest(HttpReadListener.java:255) at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:136) at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:162) at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:100) at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:57) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:291) at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:286) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.nio.QueuedNioTcpServer2.acceptTask(QueuedNioTcpServer2.java:178) at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612) at org.xnio.nio.WorkerThread.run(WorkerThread.java:479) {code} The IllegalArgumentException happens when Java's TimSort algorithm happens to detect inconsistency in the comparison. This happens because [the comparator implementation for sorting filter-ref|https://github.com/wildfly/wildfly/blob/19.1.0.Final/undertow/...] does not follow the contract for comparison.