目前，GraalVM 之外没有可用的预构建 Graal.js jar。要在其他 JDK 上运行它，您可以从 GraalVM 中提取 jar 或像这样构建它：
$ git clone [email protected]:graalvm/graaljs.git
$ git clone [email protected]:graalvm/mx.git
$ export PATH=$PWD/mx:$PATH
$ export JAVA_HOME=/usr/java/jdk1.8.0_161
$ cd graaljs/graal-js
$ mx build
请注意，它使用 JDK 8 构建得很好。它也可以在 JDK 8 上运行：
$ mx js
> typeof([] + 1)
string
>
The shell works, Ctrl+D exits it. The -v option in the previous command line shows how it launches it:
$ mx -v js
...
env JAVA_HOME=/usr/java/jdk1.8.0_161 ... \
/usr/java/jdk1.8.0_161/bin/java -d64 -cp /tmp/graal-js/graal/sdk/mxbuild/dists/graal-sdk.jar:/tmp/graal-js/graal/truffle/mxbuild/dists/truffle-api.jar:/tmp/graal-js/graal/tools/mxbuild/dists/truffle-profiler.jar:/tmp/graal-js/graal/tools/mxbuild/dists/chromeinspector.jar:/tmp/graal-js/graal/sdk/mxbuild/dists/launcher-common.jar:/tmp/graal-js/graaljs/graal-js/mxbuild/dists/graaljs-launcher.jar:/tmp/graal-js/graal/regex/mxbuild/dists/tregex.jar:/home/gmdubosc/.mx/cache/ASM_DEBUG_ALL_702b8525fcf81454235e5e2fa2a35f15ffc0ec7e.jar:/home/gmdubosc/.mx/cache/ICU4J_6f06e820cf4c8968bbbaae66ae0b33f6a256b57f.jar:/tmp/graal-js/graaljs/graal-js/mxbuild/dists/graaljs.jar -Dtruffle.js.BindProgramResult=false -Xms2g -Xmx2g -Xss16m com.oracle.truffle.js.shell.JSLauncher
所以它将这些 jar 放在类路径上：
/tmp/graal-js/graal/sdk/mxbuild/dists/graal-sdk.jar/tmp/graal-js/graal/truffle/mxbuild/dists/truffle-api.jar/tmp/graal-js/graal/tools/mxbuild/dists/truffle-profiler.jar/tmp/graal-js/graal/tools/mxbuild/dists/chromeinspector.jar/tmp/graal-js/graal/sdk/mxbuild/dists/launcher-common.jar/tmp/graal-js/graaljs/graal-js/mxbuild/dists/graaljs-launcher.jar/tmp/graal-js/graal/regex/mxbuild/dists/tregex.jar/home/gmdubosc/.mx/cache/ASM_DEBUG_ALL_702b8525fcf81454235e5e2fa2a35f15ffc0ec7e.jar/home/gmdubosc/.mx/cache/ICU4J_6f06e820cf4c8968bbbaae66ae0b33f6a256b57f.jar/tmp/graal-js/graaljs/graal-js/mxbuild/dists/graaljs.jar
查看构建工件我们还可以看到mxbuild/dists/graaljs-scriptengine.jar它负责向脚本引擎 API 注册 Graal.js。
使用一个小测试文件：
import javax.script.*;
import java.util.Arrays;
public class Test {
public static void main(String... args) throws ScriptException {
ScriptEngineManager manager = new ScriptEngineManager();
for (ScriptEngineFactory factory : manager.getEngineFactories()) {
System.out.printf("%s %s: %s %s%n", factory.getLanguageName(), factory.getLanguageVersion(), factory.getEngineName(), factory.getNames());
}
ScriptEngine engine = manager.getEngineByName("Graal.js");
if (engine != null) {
Object result = engine.eval("typeof([] + 1)");
System.out.println(result);
}
}
}
在普通 JDK 8 上编译并运行它会给出：
$ javac Test.java
$ java -cp . Test
ECMAScript ECMA - 262 Edition 5.1: Oracle Nashorn [nashorn, Nashorn, js, JS, JavaScript, javascript, ECMAScript, ecmascript]
现在 Graal.js 位于类路径中：
$ java -cp /tmp/graal-js/graal/sdk/mxbuild/dists/graal-sdk.jar:/tmp/graal-js/graal/truffle/mxbuild/dists/truffle-api.jar:/tmp/graal-js/graal/regex/mxbuild/dists/tregex.jar:/home/gmdubosc/.mx/cache/ASM_DEBUG_ALL_702b8525fcf81454235e5e2fa2a35f15ffc0ec7e.jar:/home/gmdubosc/.mx/cache/ICU4J_6f06e820cf4c8968bbbaae66ae0b33f6a256b57f.jar:/tmp/graal-js/graaljs/graal-js/mxbuild/dists/graaljs.jar:/tmp/graal-js/graaljs/graal-js/mxbuild/dists/graaljs-scriptengine.jar:. Test
ECMAScript ECMA - 262 Edition 6: Graal.js [Graal.js, graal.js, Graal-js, graal-js, Graal.JS, Graal-JS, GraalJS, GraalJSPolyglot, js, JS, JavaScript, javascript, ECMAScript, ecmascript]
ECMAScript ECMA - 262 Edition 5.1: Oracle Nashorn [nashorn, Nashorn, null, null, null, null, null, null]
string
（请注意，此命令行忽略truffle-profiler, chromeinspector, launcher-common and graaljs-launcher通过脚本引擎使用 Graal.js 时不需要。）
由于标准 JDK 8 不支持 JVMCI 和/或 Graal 编译器，因此不会对 JS 进行 JIT 编译，因此不要对性能抱有太大期望。为了获得性能，您需要特殊的 JDK 8 或 JDK 9+ 以及 Graal-Truffle 绑定。
