FULL PRODUCT VERSION :
openjdk version "9.0.1"
OpenJDK Runtime Environment (build 9.0.1+11)
OpenJDK 64-Bit Server VM (build 9.0.1+11, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Running the test case with Java 9 results in a NullPointerException. It runs successfully with Java 8.

REGRESSION. Last worked in version 8u151

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Standard output contains:
Executed
ACTUAL -
Standard output contains:
Exception in thread "main" java.lang.BootstrapMethodError: call site initialization exception
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:385)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:250)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:240)
at jdk.nashorn.javaadapters.com_example_nashorn_npe_JdkScriptingNashornNPE$CustomMenu.isManagingFocus(Unknown Source)
at java.desktop/javax.swing.JComponent.<init>(JComponent.java:603)
at java.desktop/javax.swing.AbstractButton.<init>(AbstractButton.java:74)
at java.desktop/javax.swing.JMenuItem.<init>(JMenuItem.java:145)
at java.desktop/javax.swing.JMenuItem.<init>(JMenuItem.java:124)
at com.example.nashorn.npe.JdkScriptingNashornNPE$CustomMenu.<init>(JdkScriptingNashornNPE.java:20)
at jdk.nashorn.javaadapters.com_example_nashorn_npe_JdkScriptingNashornNPE$CustomMenu.<init>(Unknown Source)
at jdk.scripting.nashorn.scripts/jdk.nashorn.internal.scripts.Script$Recompilation$2$\^eval\_$cu1$restOf/758348212.:program(<eval>:1)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:652)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:513)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:517)
at jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:448)
at jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:405)
at jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:401)
at jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:154)
at java.scripting/javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
at com.example.nashorn.npe.JdkScriptingNashornNPE.main(JdkScriptingNashornNPE.java:12)
Caused by: java.lang.NullPointerException
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.Context.getContext(Context.java:1393)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.Context.getContextTrusted(Context.java:1303)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.Context.fromClass(Context.java:1419)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.Context.getDynamicLinker(Context.java:1315)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.linker.Bootstrap.bootstrap(Bootstrap.java:223)
at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.linker.JavaAdapterServices.bootstrap(JavaAdapterServices.java:206)
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:324)
... 19 more

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.example.nashorn.npe;

import javax.script.ScriptEngineManager;
import javax.swing.JMenuItem;

public class JdkScriptingNashornNPE {

    private static final String SCRIPT = "var CustomMenu = Java.type('com.example.nashorn.npe.JdkScriptingNashornNPE$CustomMenu');"
            + "new CustomMenu('') { custom: function() { print('Executed.') } }.custom()";

    public static void main(String[] args) throws Exception {
        new ScriptEngineManager().getEngineByName("ECMAScript").eval(SCRIPT);
    }

    public abstract static class CustomMenu extends JMenuItem {

        private static final long serialVersionUID = 1L;

        public CustomMenu(String label) {
            super(label);
        }

        public abstract void custom();
    }
}
---------- END SOURCE ----------