ADDITIONAL SYSTEM INFORMATION :
openjdk version "17" 2021-09-14 LTS
OpenJDK Runtime Environment SapMachine (build 17+35-LTS-sapmachine)
OpenJDK 64-Bit Server VM SapMachine (build 17+35-LTS-sapmachine, mixed mode)


A DESCRIPTION OF THE PROBLEM :
he JavaScript enginge initialized good… but later during validating/executing specific JS script fails:
java.lang.NoClassDefFoundError: Could not initialize class org.openjdk.nashorn.internal.runtime.Context$AnonymousContextCodeInstaller
      at org.openjdk.nashorn.internal.runtime.Context.compile(Context.java:1509)
      at org.openjdk.nashorn.internal.runtime.Context.compileScript(Context.java:1449)
      at org.openjdk.nashorn.internal.runtime.Context.compileScript(Context.java:759)
      at org.openjdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:528)
      at org.openjdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:517)
      at org.openjdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:395)
      at org.openjdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:151)
      at java.scripting/javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:262)
      at com.sap.platin.base.scripting.javaScript.GuiJavaScriptInterpreter.hasEventHandler(GuiJavaScriptInterpreter.java:133)
      at com.sap.platin.base.scripting.javaScript.GuiJavaScriptEventHandler.hasEventHandler(GuiJavaScriptEventHandler.java:162)
      at com.sap.platin.base.scripting.javaScript.GuiScriptWindow.<init>(GuiScriptWindow.java:193)
      at com.sap.platin.base.scripting.javaScript.GuiJavaScriptEventHandler.openScriptWindow(GuiJavaScriptEventHandler.java:294)

MAIN REASON -> limitation access to internal classes in JDK 17:
Related to JDK17 & new standalone JS Engine:
Main reason limitation in JDK17 with access to internal “deprecated” classes:
Caused by: java.lang.NoSuchMethodError: 'java.lang.Class sun.misc.Unsafe.defineAnonymousClass(java.lang.Class, byte[], java.lang.Object[])'

REGRESSION : Last worked in version 16.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Any small application with Java + Nashorn...

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should be executed JavaScript code without issues
ACTUAL -
Related to JDK17 & new standalone JS Engine (Nashorn standalone 15.3):
Main reason limitation in JDK17 with access to internal “deprecated” classes:
Caused by: java.lang.NoSuchMethodError: 'java.lang.Class sun.misc.Unsafe.defineAnonymousClass(java.lang.Class, byte[], java.lang.Object[])'

CUSTOMER SUBMITTED WORKAROUND :
Not exist on Java 17.

FREQUENCY : always