----- Original Message ----- > From: "Attila Szegedi" <szege...@gmail.com> > To: "nashorn-dev" <nashorn-dev@openjdk.java.net> > Cc: "Greg Watts" <gwa...@us.ibm.com> > Sent: Lundi 28 Juin 2021 19:07:38 > Subject: Re: Does Nashorn (org.openjdk.nashorn) have any support for Java 17?
> Hi Greg, > > that’s a consequence of Java 17 removing the Unsafe.defineAnonymousClass > method. > Unfortunately, we don’t have an ideal replacement for it yet. > MethodHandles.Lookup.defineHiddenClass is supposed to be a publicly supported > replacement, but it hides the generated classes from stack traces, and that > makes Nashorn incorrectly report exception stack traces, since we use this > method to emit code compiled from scripts. > > There’s been some discussion about this[0] and the JDK team at Oracle is aware > that we’d need a better replacement API but there’s not one available yet :-( > > We use Unsafe.defineAnonymousClass for Nashorn’s lazy compilation feature, > where > it compiles every function independently just before it is executed for the > first time. This is in contrast to eager compilation, where the whole script > is > compiled when it is loaded. Lazy compilation is the default. > > One thing you can do right now is try to somehow pass “false” as the value of > the “lazy.compilation” system property to turn off lazy compilation. > > I’ve been working on a branch that’ll handle the problem gracefully and > default > to eager compilation if Unsafe.defineAnonymousClass is not present in the Java > runtime. I’ll probably make a release soon with this fix. In the meantime, I think you can use Lookup.defineClass() or do you rely on the weird security model of the anonymous classes ? > > Hope this helps, > Attila. Rémi > > [0] https://mail.openjdk.java.net/pipermail/core-libs-dev/2021-May/077347.html > > >> On 2021. Jun 28., at 18:24, Greg Watts <gwa...@us.ibm.com> wrote: >> >> >> Dear Nashorn development team, >> >> I am trying to run an ANT build of our product using >> nashorn-core:15.1.1.jar with Java 17 (pre-release - build 27) and I get: >> >> BUILD FAILED >> java.lang.ExceptionInInitializerError >> 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 >> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native >> Method) >> at >> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) >> at >> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> at java.base/java.lang.reflect.Method.invoke(Method.java:568) >> at org.apache.tools.ant.util.ReflectUtil.invoke(ReflectUtil.java:108) >> at >> org.apache.tools.ant.util.ReflectWrapper.invoke(ReflectWrapper.java:81) >> at >> org.apache.tools.ant.util.optional.JavaxScriptRunner.evaluateScript(JavaxScriptRunner.java:103) >> at >> org.apache.tools.ant.util.optional.JavaxScriptRunner.executeScript(JavaxScriptRunner.java:67) >> at >> org.apache.tools.ant.taskdefs.optional.Script.execute(Script.java:52) >> at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) >> at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) >> at >> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> at java.base/java.lang.reflect.Method.invoke(Method.java:568) >> at >> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) >> at org.apache.tools.ant.Task.perform(Task.java:348) >> at org.apache.tools.ant.Target.execute(Target.java:392) >> at org.apache.tools.ant.Target.performTasks(Target.java:413) >> at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399) >> at org.apache.tools.ant.Project.executeTarget(Project.java:1368) >> at >> org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) >> at org.apache.tools.ant.Project.executeTargets(Project.java:1251) >> at org.apache.tools.ant.Main.runBuild(Main.java:811) >> at org.apache.tools.ant.Main.startAnt(Main.java:217) >> at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280) >> at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109) >> Caused by: java.lang.RuntimeException: java.lang.NoSuchMethodException: no >> such method: >> sun.misc.Unsafe.defineAnonymousClass(Class,byte[],Object[])Class/invokeVirtual >> at org.openjdk.nashorn.internal.runtime.Context >> $AnonymousContextCodeInstaller.lambda$getDefineAnonymousClass >> $0(Context.java:335) >> at >> java.base/java.security.AccessController.doPrivileged(AccessController.java:318) >> at org.openjdk.nashorn.internal.runtime.Context >> $AnonymousContextCodeInstaller.getDefineAnonymousClass(Context.java:327) >> at org.openjdk.nashorn.internal.runtime.Context >> $AnonymousContextCodeInstaller.<clinit>(Context.java:317) >> ... 33 more >> Caused by: java.lang.NoSuchMethodException: no such method: >> sun.misc.Unsafe.defineAnonymousClass(Class,byte[],Object[])Class/invokeVirtual >> at >> java.base/java.lang.invoke.MemberName.makeAccessException(MemberName.java:976) >> at java.base/java.lang.invoke.MemberName >> $Factory.resolveOrFail(MemberName.java:1117) >> at java.base/java.lang.invoke.MethodHandles >> $Lookup.resolveOrFail(MethodHandles.java:3643) >> at java.base/java.lang.invoke.MethodHandles >> $Lookup.findVirtual(MethodHandles.java:2680) >> at org.openjdk.nashorn.internal.runtime.Context >> $AnonymousContextCodeInstaller.lambda$getDefineAnonymousClass >> $0(Context.java:329) >> ... 36 more >> Caused by: java.lang.NoSuchMethodError: 'java.lang.Class >> sun.misc.Unsafe.defineAnonymousClass(java.lang.Class, byte[], >> java.lang.Object[])' >> at java.base/java.lang.invoke.MethodHandleNatives.resolve(Native >> Method) >> at java.base/java.lang.invoke.MemberName >> $Factory.resolve(MemberName.java:1085) >> at java.base/java.lang.invoke.MemberName >> $Factory.resolveOrFail(MemberName.java:1114) >> ... 39 more >> >> >> So I was curious to know please if Nashorn will be supported in Java 17, >> and if so, when you might anticipate that to be released (ballpark >> estimate)? >> >> >> Greg Watts >> WebSphere Zombie Apocalypse Team >> External: 507-253-8901 >> email: gwa...@us.ibm.com >> >> "Take risks: if you win, you will be happy; if you lose, you will be wise" > > - Unknown
