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) ~[?:?]

即从未到达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。如果没有，那可能是一个bug。你能把问题提交给吗https://github.com/oracle/graaljs.

它在最简单的测试中确实对我有效，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Java应用程序中嵌入JS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)