ModuleClassLoader fails with ClassNotFoundException when class in a jar file ---------------------------------------------------------------------------- Key: WFLY-11411 URL: https://issues.jboss.org/browse/WFLY-11411 Project: WildFly Issue Type: Bug Components: Class Loading Affects Versions: 11.0.0.Final, 14.0.0.Final Environment: Wildfly 11, 14, Java 1.8, Windows 10 Reporter: Karl Nicholas Assignee: Yeray Borges Priority: Major Attachments: JaxRsActivator.java, RestSever.java Simple REST service with Application activator in project and Rest Server in another project with jar file fails to load. Works okay with EAR project structure but not with simpler WAR project structure. Caused by: java.lang.ClassNotFoundException: rest.service.server.RestSever from [Module "deployment.restserver7.war" from Service Module Loader] at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:198) at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:412) at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:400) at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:116)