使用GraalVM的JavaScript代码中的Java对象为“未定义”

时间:2019-05-23 04:41:08

标签: javascript java graalvm

我正在使用GraalVM与JavaScript进行互操作,因为Nashorn is due to be deprecated

问题是我的变量在JavaScript运行时中是undefined

ScriptEngine engine = new ScriptEngineManager().getEngineByName("graal.js");
String path = "rules.js";
InputStream is = Main.class.getClassLoader().getResourceAsStream(path);
Reader reader = new InputStreamReader(is);

engine.eval(reader);
Invocable inv = (Invocable) engine;
Object obj = engine.get("obj");

User user = new User();
user.setName("username");
user.setProfile("admin");

Boolean value = (Boolean) inv.invokeMethod(obj, "validatePermission", user);

这是我正在运行的JavaScript代码:

var obj = new Object();

obj.validatePermission = function(user) {
    console.log(user.profile)
    if(user.profile === 'admin') {
        return true;
    } else {
        throw 'Unauthorized. User must be administrator.';
    }
}

POM依赖项:

<project>
    <properties>
        <graalvm.version>19.0.0</graalvm.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.graalvm.js</groupId>
            <artifactId>js</artifactId>
            <version>${graalvm.version}</version>
        </dependency>
        <dependency>
            <groupId>org.graalvm.js</groupId>
            <artifactId>js-scriptengine</artifactId>
            <version>${graalvm.version}</version>
        </dependency>
        <dependency>
            <groupId>org.graalvm.truffle</groupId>
            <artifactId>truffle-api</artifactId>
            <version>${graalvm.version}</version>
        </dependency>
    </dependencies>
</project>

1 个答案:

答案 0 :(得分:0)

设置Nashorn兼容模式即可解决。

System.setProperty("polyglot.js.nashorn-compat", "true");

有关此处的更多信息:Nashorn Migration Guide

以上所有信息均由GraalVM团队提供this issue