FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+161)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+161, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Professional Edition 64 bit

A DESCRIPTION OF THE PROBLEM :
When launching my application with javaws I got the exception:

java.lang.NoClassDefFoundError: javax/xml/bind/JAXBContext
at cin.confirma.applet.managers.EnvironmentManager.getTokenEnvironment(EnvironmentManager.java:126)
at cin.confirma.jws.configuration.Initializer.initializeApplication(Initializer.java:150)
at cin.confirma.jws.SignerJWS.main(SignerJWS.java:48)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.executeApplication(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBContext
at jdk.deploy@9-ea/com.sun.deploy.security.DeployURLClassLoader.findClass(Unknown Source)
at jdk.javaws@9-ea/com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at jdk.javaws@9-ea/com.sun.jnlp.JNLPClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
... 12 more
mar 24, 2017 11:17:45 AM cin.confirma.jws.configuration.Initializer initializationError
GRAVE: javax/xml/bind/JAXBContext
java.lang.NoClassDefFoundError: javax/xml/bind/JAXBContext
at cin.confirma.applet.managers.EnvironmentManager.getTokenEnvironment(EnvironmentManager.java:126)
at cin.confirma.jws.configuration.Initializer.initializeApplication(Initializer.java:150)
at cin.confirma.jws.SignerJWS.main(SignerJWS.java:48)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.executeApplication(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at jdk.javaws@9-ea/com.sun.javaws.Launcher.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBContext
at jdk.deploy@9-ea/com.sun.deploy.security.DeployURLClassLoader.findClass(Unknown Source)
at jdk.javaws@9-ea/com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at jdk.javaws@9-ea/com.sun.jnlp.JNLPClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
... 12 more

I have added in jnlp file:
...
<j2se version="1.6+" java-vm-args="--add-modules java.xml.bind"/>
...

but still not working, while similar code launched with java and same arg doesn't result in any Issue

I found an old Bug indicating a very similar problem:

http://bugs.java.com/view_bug.do?bug_id=8152839

Could it be a Regression case?

Thanks for yout attention


REGRESSION. Last worked in version 8u121

ADDITIONAL REGRESSION INFORMATION:
I didn't check in other early access versions for java 9

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Should start as webstart code like this:

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

public class Test {
        public static void main(String[] args) {
                try {
JAXBContext.newInstance("NotExistent.class");
} catch (JAXBException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
        }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
javax.xml.bind.JAXBException: "NotExistent.class" non contiene ObjectFactory.class o jaxb.index
        at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at java.xml.bind@9-ea/javax.xml.bind.ContextFinder.newInstance(Unknown Source)
        at java.xml.bind@9-ea/javax.xml.bind.ContextFinder.newInstance(Unknown Source)
        at java.xml.bind@9-ea/javax.xml.bind.ContextFinder.find(Unknown Source)
        at java.xml.bind@9-ea/javax.xml.bind.JAXBContext.newInstance(Unknown Source)
        at java.xml.bind@9-ea/javax.xml.bind.JAXBContext.newInstance(Unknown Source)
        at java.xml.bind@9-ea/javax.xml.bind.JAXBContext.newInstance(Unknown Source)
        at it.test.Test.main(Test.java:8)
ACTUAL -
java.lang.NoClassDefFoundError: javax/xml/bind/JAXBContext

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

public class Test {
        public static void main(String[] args) {
                try {
JAXBContext.newInstance("NotExistent.class");
} catch (JAXBException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
        }
}
---------- END SOURCE ----------