graalvm - graal js解释器无法捕获自定义新错误

Question

try {
  if (typeof hostObj['propertyItDoesntHave'] === "undefined") {
    throw new Error('first');
  }
} catch (e) {
  throw new Error('second');
}

对我来说，这总是崩溃：

org.graalvm.polyglot.PolyglotException: Error: first
    at <js>.:anonymous(Unnamed:21) ~[?:?]
    at <js>.:=>(Unnamed:21) ~[?:?]
    at <js>.:=>(Unnamed:21) ~[?:?]

即永远不会到达catch 块，第一个错误似乎是停止程序。

如何让 GraalVM JavaScript 解释器捕获这样的嵌套错误？

Answer 1

我认为它应该开箱即用。如果不是，它可能是一个错误。您能否向https://github.com/oracle/graaljs提交问题。

它在最简单的测试中对我有用，我正在尝试最新版本 21.1node和js.

which node
~/21.1/graalvm-ce-java11-21.1.0/bin/node
[opc@ol8-demo 21.1]$ node
Welcome to Node.js v14.16.1.
Type ".help" for more information.
> try {
...   if (typeof hostObj['propertyItDoesntHave'] === "undefined") {
.....     throw new Error('first');
.....   }
... } catch (e) {
...   throw new Error('second');
... }
Uncaught Error: second
>
>
(To exit, press Ctrl+C again or Ctrl+D or type .exit)
>
[opc@ol8-demo 21.1]$ js
> try {
>   if (typeof hostObj['propertyItDoesntHave'] === "undefined") {
>     throw new Error('first');
>   }
> } catch (e) {
>   throw new Error('second');
> }
>
Error: second
    at <js> :program(<shell>:1:6:126-144)
>

在将 JS 嵌入 Java 应用程序时：

import org.graalvm.polyglot.*;
import org.graalvm.polyglot.Context.Builder;
import org.graalvm.polyglot.proxy.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        try (Context context = Context.newBuilder()
            .allowAllAccess(true)
            .build()) {
            
            context.eval("js",
                "{ " +
                "try {" +
                "  if (typeof hostObj['propertyItDoesntHave'] === \"undefined\") {" +
                "    throw new Error('first');" +
                "  }" +
                "} catch (e) {" +
                "  throw new Error('second'); " +
                " } " +
                "}");

        }
    }
}

我确实得到了第二个：

javac Main.java && java Main
Exception in thread "main" Error: second
    at <js> :program(Unnamed:1:123-141)
    at org.graalvm.sdk/org.graalvm.polyglot.Context.eval(Context.java:379)
    at Main.main(Main.java:12)