JenkinsRule: Jetty leaves stray threads after server.stop()

[Abhyudaya Sharma]

Hi everyone!

I was debugging through JenkinsRule from Jenkins Test Harness. After the Jetty server and Jenkins have both been terminated in JenkinsRule#after() (line 488 and line 502, respectively) stray threads keep running. Attached is the dump of the running threads. Is it possible to terminate these threads to allow the JVM to exit gracefully?

This issue may already have been reported before in this Stack Overflow question: https://stackoverflow.com/questions/13769007/jetty-server-leaves-behind-threads-after-stop

A minimal example would be following test code and setting a breakpoint at the System.gc() call on line 517:

import org.junit.Rule;

import org.junit.Test;
import org.jvnet.hudson.test.JenkinsRule;

public class RandomTest {
    @Rule
    public JenkinsRule jenkinsRule = new JenkinsRule();

    @Test
    public void randomTest() {
        System.out.println("Hello world");
    }
}

Thanks 

Abhyudaya Sharma

[Olivier Lamy]

Hi
Do you have same issue when using an other OS (i.e not windows)?
I remember some issues with selector on windows.
What are jetty version and jdk version?

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Olivier Lamy
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[Abhyudaya Sharma]

Hi

I was able to confirm the same behavior on Kubuntu 19.04 on Oracle JDK 1.8.0_181. I had originally run it on Windows 10 using the same version of the JDK. Jetty is 9.4.5v20170502.

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[Olivier Lamy]

can you upgrade to last Jetty 9.4.18.v20190429? and tell us if you have same issue

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[Abhyudaya Sharma]

Hi

Yes, I was able to confirm it on both Linux and Windows with the latest Jetty.

Thanks

Abhyudaya Sharma

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[Baptiste Mathus]

Can you please file a JIRA with details you found and reproducer?

Thanks!

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[Abhyudaya Sharma]

Hi,

I've created JENKINS-57774 on the JIRA.

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