Nashorn (org.openjdk.nashorn) 对 Java 17 有支持吗？

Question

我尝试使用 nashorn-core:15.1.1.jar 和 Java 17（预发布 - build 27）运行我们产品的 ANT 版本，我得到：

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

我可能还为时过早，无法在 Java 17 中使用 Nashorn，但我想我会检查一下。

Answer 1

是的，OpenJDK Nashorn从版本 15.3 开始支持 Java 17。

它必须进行调整才能优雅地处理defineAnonymousClassJava 17 中方法已从类中删除的事实Unsafe。

Answer 2

不幸的是，对 Java Nashorn 的支持已被删除，Java 15并且这种情况将保持下去。从那时起它就被弃用了Java 11。

我建议，如果可能的话，迁移到积极维护的GraalVM JavaScript 。主要原因Nashhorn已被删除Java 15。

Nashorn JavaScript 引擎首先通过 JEP 174 合并到 JDK 8 中，作为 Rhino 脚本引擎的替代品。当它发布时，它是 ECMAScript-262 5.1 标准的完整实现。随着 ECMAScript 语言结构以及 API 的快速调整和修改，我们发现 Nashorn 的维护具有挑战性。