[jboss-jira] [JBoss JIRA] (WFLY-4757) mod_cluster subsystem's "proxies" attribute causes hot deployment failure

mod_cluster subsystem's "proxies" attribute causes hot deployment failure ------------------------------------------------------------------------- Key: WFLY-4757 URL: https://issues.jboss.org/browse/WFLY-4757 Project: WildFly Issue Type: Bug Affects Versions: 9.0.0.CR1, 10.0.0.Alpha2 Reporter: Michal Babacek Assignee: Radoslav Husar Priority: Blocker Labels: mod_cluster Fix For: 9.0.0.Final, 10.0.0.Alpha3 If one takes a vanilla EAP 7 DR build and starts it with {{./standalone.sh -c standalone.ha}}, i.e. with mod_cluster subsystem loaded, but without any static proxies configuration directives, the server registers with mod_cluster load balancers and accepts hot deployments without any error. If one sets a static proxy configuration, e.g.: {code:xml} +++ <mod-cluster-config advertise-socket="modcluster" connector="ajp" proxies="my-proxy-one"> +++ <outbound-socket-binding name="my-proxy-one"> <remote-destination host="10.40.4.50" port="6666"/> </outbound-socket-binding> +++ {code} then the server processes hot deployments only as long as it's not registered with any mod_cluster load balancer. As soon as it registers with a load balancer, any hot deployment causes the following exception: {noformat} 14:39:13,475 INFO [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) WFLYDS0004: Found simplecontext.war in deployment directory. To trigger deployment create a file called simplecontext.war.dodeploy 14:39:13,520 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) WFLYSRV0027: Starting deployment of "simplecontext.war" (runtime-name: "simplecontext.war") 14:39:14,028 INFO [org.wildfly.extension.undertow] (MSC service thread 1-2) WFLYUT0021: Registered web context: /simplecontext 14:39:14,080 ERROR [org.jboss.as.controller.management-operation] (DeploymentScanner-threads - 2) WFLYCTL0008: Failed to persist configuration change: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0084: Failed to marshal configuration at org.jboss.as.controller.persistence.AbstractFilePersistenceResource.<init>(AbstractFilePersistenceResource.java:49) at org.jboss.as.controller.persistence.ConfigurationFilePersistenceResource.<init>(ConfigurationFilePersistenceResource.java:45) at org.jboss.as.controller.persistence.BackupXmlConfigurationPersister.store(BackupXmlConfigurationPersister.java:109) at org.jboss.as.controller.ModelControllerImpl.writeModel(ModelControllerImpl.java:738) at org.jboss.as.controller.OperationContextImpl.createPersistenceResource(OperationContextImpl.java:403) at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:643) at org.jboss.as.controller.AbstractOperationContext.completeStepInternal(AbstractOperationContext.java:354) at org.jboss.as.controller.AbstractOperationContext.finishStep(AbstractOperationContext.java:918) at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:885) at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:601) at org.jboss.as.controller.AbstractOperationContext.completeStepInternal(AbstractOperationContext.java:354) at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:330) at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1170) at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:363) at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:219) at org.jboss.as.controller.ModelControllerImpl$3$1$1.run(ModelControllerImpl.java:716) at org.jboss.as.controller.ModelControllerImpl$3$1$1.run(ModelControllerImpl.java:710) at java.security.AccessController.doPrivileged(Native Method) at org.jboss.as.controller.ModelControllerImpl$3$1.run(ModelControllerImpl.java:710) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) at org.jboss.threads.JBossThread.run(JBossThread.java:320) Caused by: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0089: Failed to write configuration at org.jboss.as.controller.persistence.AbstractConfigurationPersister.marshallAsXml(AbstractConfigurationPersister.java:100) at org.jboss.as.controller.persistence.AbstractFilePersistenceResource.<init>(AbstractFilePersistenceResource.java:42) ... 26 more Caused by: java.lang.reflect.UndeclaredThrowableException at org.jboss.staxmapper.FormattingXMLStreamWriter$4.run(FormattingXMLStreamWriter.java:249) at org.jboss.staxmapper.FormattingXMLStreamWriter.runAttrQueue(FormattingXMLStreamWriter.java:221) at org.jboss.staxmapper.FormattingXMLStreamWriter.writeStartElement(FormattingXMLStreamWriter.java:96) at org.wildfly.extension.mod_cluster.ModClusterSubsystemXMLWriter.writeDynamicLoadProvider(ModClusterSubsystemXMLWriter.java:104) at org.wildfly.extension.mod_cluster.ModClusterSubsystemXMLWriter.writeModClusterConfig(ModClusterSubsystemXMLWriter.java:69) at org.wildfly.extension.mod_cluster.ModClusterSubsystemXMLWriter.writeContent(ModClusterSubsystemXMLWriter.java:51) at org.wildfly.extension.mod_cluster.ModClusterSubsystemXMLWriter.writeContent(ModClusterSubsystemXMLWriter.java:42) at org.jboss.as.server.parsing.StandaloneXml_4.writeServerProfile(StandaloneXml_4.java:695) at org.jboss.as.server.parsing.StandaloneXml_4.writeContent(StandaloneXml_4.java:613) at org.jboss.as.server.parsing.StandaloneXml.writeContent(StandaloneXml.java:77) at org.jboss.as.server.parsing.StandaloneXml.writeContent(StandaloneXml.java:47) at org.jboss.staxmapper.XMLMapperImpl.doDeparse(XMLMapperImpl.java:88) at org.jboss.staxmapper.XMLMapperImpl.deparseDocument(XMLMapperImpl.java:83) at org.jboss.as.controller.persistence.AbstractConfigurationPersister.marshallAsXml(AbstractConfigurationPersister.java:94) ... 27 more Caused by: javax.xml.stream.XMLStreamException: Trying to write an attribute when there is no open start element. at com.ctc.wstx.sw.BaseStreamWriter.throwOutputError(BaseStreamWriter.java:1537) at com.ctc.wstx.sw.BaseStreamWriter.reportNwfStructure(BaseStreamWriter.java:1566) at com.ctc.wstx.sw.BaseNsStreamWriter.writeAttribute(BaseNsStreamWriter.java:226) at org.jboss.staxmapper.FormattingXMLStreamWriter$4.run(FormattingXMLStreamWriter.java:247) ... 40 more 14:39:14,085 ERROR [org.jboss.as.server] (DeploymentScanner-threads - 2) WFLYSRV0021: Deploy of deployment "simplecontext.war" was rolled back with the following failure message: "WFLYCTL0086: Failed to persist configuration change: WFLYCTL0084: Failed to marshal configuration" 14:39:14,095 INFO [org.jboss.modcluster] (MSC service thread 1-3) MODCLUSTER000021: All pending requests drained from default-host:/simplecontext in 0.0 seconds 14:39:14,098 INFO [org.wildfly.extension.undertow] (MSC service thread 1-3) WFLYUT0022: Unregistered web context: /simplecontext 14:39:14,142 INFO [org.hibernate.validator.internal.util.Version] (MSC service thread 1-8) HV000001: Hibernate Validator 5.1.3.Final 14:39:14,177 INFO [org.jboss.as.server.deployment] (MSC service thread 1-2) WFLYSRV0028: Stopped deployment simplecontext.war (runtime-name: simplecontext.war) in 92ms {noformat} The problem is IMHO related to the new configuration attribute WFLY-457. Note that this issue affects *hot deployments only*. If the server starts with deployments already present, no exception is thrown and everything works as expected. I find this issue being of {color:red}critical{color} severity, because it breaks core functionality of the application server -- hot deployments.