[jboss-jira] [JBoss JIRA] (WFLY-13043) ManagedScheduledExecutorService keeps executing tasks after an exception is thrown

[Vinicius Kopcheski (Jira)]

Vinicius Kopcheski created WFLY-13043:
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             Summary:  ManagedScheduledExecutorService keeps executing tasks after an exception is thrown
                 Key: WFLY-13043
                 URL: https://issues.redhat.com/browse/WFLY-13043
             Project: WildFly
          Issue Type: Bug
          Components: Concurrency Utilities
    Affects Versions: 18.0.1.Final
            Reporter: Vinicius Kopcheski
            Assignee: Eduardo Martins


There is apparently a bug in the implementation of the ManagedScheduledExecutorService, more specifically when using the inherited method of the ScheduledExecutorService, [scheduleWithFixedDelay|https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ScheduledExecutorService.html#scheduleAtFixedRate(java.lang.Runnable,%20long,%20long,%20java.util.concurrent.TimeUnit)]. On its javadoc it is stated "If any execution of the task encounters an exception, subsequent executions are suppressed.".

When [this code|https://github.com/kopcheski/managed-scheduled-executor/blob/master/src/main/java/org/example/MyExecutor.java] is executed in any Wildfly from 10 to 18, the task is kept alive in the scheduler after an exception is thrown and subsequent calls will happen anyway, contradicting the javadoc.

To add evidences of a misbehavior, I did two extra checks:

1. Running the exact same code in another JavaEE server (Payara);
2. Using plain JavaSE with the ScheduledExecutorService.

In both cases, after an exception being thrown, subsequent executions of it are - as the javadoc states - suppressed.




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