We have internal server error and have seen below issue and what we can do to resolve this issue

Env : wildfly -11-0-0 final

XA data source

Min-pool :10 and max-pool :200

ERROR [io.undertow.request] (default task-19) UT005023: Exception handling request to /kohls-app/: javax.servlet.ServletException: com.vaadin.server.ServiceException: java.lang.RuntimeException: CustomHostSystem.constructor: failed with error: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/my_data_source

        at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:381)

        at innowake.maxenso.runtime.client.vaadin.Servlet.service(Servlet.java:125)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

        at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)

        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)

        at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:130)

        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)

        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)

        at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)

        at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)

        at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)

        at org.wildfly.elytron.web.undertow.server.ElytronRunAsHandler.lambda$handleRequest$1(ElytronRunAsHandler.java:68)

        at org.wildfly.security.auth.server.FlexibleIdentityAssociation.runAsFunctionEx(FlexibleIdentityAssociation.java:101)

        at org.wildfly.security.auth.server.Scoped.runAsFunctionEx(Scoped.java:150)

        at org.wildfly.security.auth.server.Scoped.runAs(Scoped.java:62)

        at org.wildfly.elytron.web.undertow.server.ElytronRunAsHandler.handleRequest(ElytronRunAsHandler.java:67)

        at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)

        at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)

        at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33)

        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

        at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53)

        at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)

        at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)

        at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59)

        at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)

        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

        at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)

        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

        at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)

        at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

        at io.undertow.server.handlers.MetricsHandler.handleRequest(MetricsHandler.java:64)

        at io.undertow.servlet.core.MetricsChainHandler.handleRequest(MetricsChainHandler.java:59)

        at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)

        at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)

        at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)

        at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)

        at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)

        at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)

        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)

        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)

        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)

        at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)

        at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)

        at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)

        at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)

        at io.undertow.server.Connectors.executeRootHandler(Connectors.java:326)

        at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

        at java.lang.Thread.run(Thread.java:748)

Caused by: com.vaadin.server.ServiceException: java.lang.RuntimeException: CustomHostSystem.constructor: failed with error: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/DB2DS

        at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1474)

        at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1434)

        at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)

        ... 49 more