JAXB class not found with ForkJoinPool Java

I use jaxb for unmarshalling, but when I use a ForkJoinPool execute() method, I get a "java.log.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory", but I'm sure of the presence in the classpath in my runtime, because when I don't use a ForkJoinPool it work properly ... do you know a problem or workaround for that ?

I use Java 11

my code:

ForkJoinPool commonPool = ForkJoinPool.commonPool();
        commonPool.execute(() -> {
            try {
                String messageFileContent = Files.readString(Paths.get(
                        this.getClass().getClassLoader().getResource("xml-to-process.xml").getPath()));

                JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
                Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
                // avoiding schema validation for more performance
                jaxbUnmarshaller.setSchema(null);
                UpdateWorkOrder updateWorkOrder = (UpdateWorkOrder) jaxbUnmarshaller.unmarshal(new StringReader(messageFileContent));
            } catch (Exception e) {
                e.printStackTrace();
            }
        });

it's very strange no ... ? Outside the execute() of ForkJoinPool, the parsing was correclty performed.

The error is:

javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]
java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at javax.xml.bind.ServiceLoaderUtil.nullSafeLoadClass(ServiceLoaderUtil.java:92)
at javax.xml.bind.ServiceLoaderUtil.safeLoadClass(ServiceLoaderUtil.java:125)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:230)

This can occur if the ForkJoinPool is using a different ClassLoader than your application, especially if you are using a web container like Tomcat.

You can try setting a thread factory for your ForkJoinPool, and within that factory, set the context classloader of the created thread to the correct application classloader.