Thread context class loader is wrong for ScheduledExecutorService threads ------------------------------------------------------------------------- Key: WFLY-12098 URL: https://issues.jboss.org/browse/WFLY-12098 Project: WildFly Issue Type: Bug Components: Class Loading Affects Versions: 16.0.0.Final Reporter: Paul Pogonyshev Assignee: Richard Opalka Priority: Major Tasks submitted to the standard ScheduledExecutorService (JNDI: java:comp/DefaultManagedScheduledExecutorService) are executed in threads with class loader that cannot find application classes. This is a regression in 16.0 compared to 14.0 (haven't tested 15). Tasks submitted to the simple ExecutorService (JNDI: java:comp/DefaultManagedExecutorService) see the correct class loader. I.e. if I submit something like () -> { System.out.println (Thread.currentThread ().getContextClassLoader (); } to both services (i.e. exactly the same task), I get the following output. For ScheduledExecutorService (wrong): ModuleClassLoader for Module "org.jboss.as.ee" version 16.0.0.Final from local module loader @275710fc (finder: local module finder @525f1e4e (roots: [...]/wildfly/modules,[...]/wildfly/modules/system/layers/base)) For ExecutorService (as expected): ModuleClassLoader for Module "deployment.[...].war" from Service Module Loader Plain ExecutorService sees exactly the same class loader as normal threads in which HTTP request are processed. In version 14.0 this was also true for ScheduledExecutorService.