service library in Jenkins

[nicolas de loof]

Hi there,

I'm writing an extension to jenkins that can't be packaged as a plugin (need to be ran before plugins get loaded) so I created an InitLoader as a Service

@MetaInfServices

public class InitListener implements InitReactorListener {

    @Override

    public void onTaskStarted(Task task) {

        System.out.println("started :" + task.toString());

    }

...

}

When Jenkins starts I get this error =

GRAVE: Failed to initialize Jenkins

hudson.util.HudsonFailedToLoad: java.lang.NoClassDefFoundError: hudson/init/InitReactorListener

at hudson.WebAppMain$3.run(WebAppMain.java:247)

Caused by: java.lang.NoClassDefFoundError: hudson/init/InitReactorListener

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)

at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

at java.net.URLClassLoader$1.run(URLClassLoader.java:368)

at java.net.URLClassLoader$1.run(URLClassLoader.java:362)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:361)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:560)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:348)

at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:370)

at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)

at java.util.ServiceLoader$1.next(ServiceLoader.java:480)

at com.google.common.collect.Lists.newArrayList(Lists.java:139)

at com.google.common.collect.Lists.newArrayList(Lists.java:119)

at jenkins.InitReactorRunner.buildReactorListener(InitReactorRunner.java:63)

at jenkins.InitReactorRunner.run(InitReactorRunner.java:48)

at jenkins.model.Jenkins.executeReactor(Jenkins.java:1096)

at jenkins.model.Jenkins.<init>(Jenkins.java:900)

at hudson.model.Hudson.<init>(Hudson.java:85)

at hudson.model.Hudson.<init>(Hudson.java:81)

at hudson.WebAppMain$3.run(WebAppMain.java:233)

For a reason I can't get, this service when loaded can't access jenkins.war core classes.

I'm running from plain jenkins.war 

java -jar jenkins-2.107.3.war --commonLibFolder=./lib/

Any thoughts ?

[Jesse Glick]

On Fri, May 18, 2018 at 9:03 AM, nicolas de loof
<nicolas...@gmail.com> wrote:
> I'm writing an extension to jenkins that can't be packaged as a plugin (need
> to be ran before plugins get loaded)

I think what you are looking for is to use a standard plugin layout
but replacing

<packaging>hpi</packaging>

with

<packaging>jenkins-module</packaging>

and then add it to the list here:

https://github.com/jenkinsci/jenkins/blob/ac749d669d6ba8bd77c0827c8705c9454f973a6a/war/pom.xml#L95-L134

or use `custom-war-packager` to retrofit it into an existing
`jenkins.war` artifact.

(Most of these actually could be converted to regular plugins, I
think; it is only those things which genuinely need to run code before
the Jenkins plugin manager is initialized which must be modules, such
as `ConfidentialStore` implementations.)

[nicolas de loof]

Thanks for the tip

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[nicolas de loof]

didn't help unfortunately. Still get NoClassDefFoundError: hudson/model/listeners/RunListener

note : I'm not using custom-war-packager, but --commonLibFolder jenkins.war launcher option. Not sure this is commonly used ...

2018-05-18 18:53 GMT+02:00 nicolas de loof <nicolas...@gmail.com>:

Thanks for the tip

Le ven. 18 mai 2018 à 18:50, Jesse Glick <jgl...@cloudbees.com> a écrit :

On Fri, May 18, 2018 at 9:03 AM, nicolas de loof
<nicolas...@gmail.com> wrote:
> I'm writing an extension to jenkins that can't be packaged as a plugin (need
> to be ran before plugins get loaded)

I think what you are looking for is to use a standard plugin layout
but replacing

<packaging>hpi</packaging>

with

<packaging>jenkins-module</packaging>

and then add it to the list here:

https://github.com/jenkinsci/jenkins/blob/ac749d669d6ba8bd77c0827c8705c9454f973a6a/war/pom.xml#L95-L134

or use `custom-war-packager` to retrofit it into an existing
`jenkins.war` artifact.

(Most of these actually could be converted to regular plugins, I
think; it is only those things which genuinely need to run code before
the Jenkins plugin manager is initialized which must be modules, such
as `ConfidentialStore` implementations.)

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[Jesse Glick]

On Fri, May 18, 2018 at 3:19 PM, nicolas de loof
<nicolas...@gmail.com> wrote:
> I'm not using custom-war-packager, but --commonLibFolder jenkins.war
> launcher option.

Never heard of it, and likely does not work for this purpose. You need
an entry in `jenkins.war!/WEB-INF/lib/*.jar` as I said.

[nicolas de loof]

right, this option indeed is used to add some jars to the higher level classloader

(https://github.com/jenkinsci/winstone/blob/d806054073b86d1420ff8fd1cc9bc173ef016c7c/src/main/java/winstone/Launcher.java#L110)

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