java 內建的js 引擎nashorn已經是被淘汰的，oracle 比較推薦的是使用graalvm js，以下是一個簡單的整合試用

環境準備

• pom.xml

  <?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 

  <modelVersion>4.0.0</modelVersion>

​

  <groupId>com.dalong.ex</groupId>

  <artifactId>qlex-learnint</artifactId>

  <version>1.0-SNAPSHOT</version>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 

    <encoding>UTF-8</encoding>

    <java.version>1.8</java.version>

    <maven.compiler.source>1.8</maven.compiler.source>

    <maven.compiler.target>1.8</maven.compiler.target>

  </properties>

  <dependencies>

    <dependency>
 

      <groupId>com.alibaba</groupId>

      <artifactId>QLExpress</artifactId>

      <version>3.2.0</version>

    </dependency>

<!--    如果使用了js-scriptengine 以下可選-->

<!--    <dependency>-->

<!--      <groupId>org.graalvm.truffle</groupId>-->

<!--      <artifactId>truffle-api</artifactId>-->

<!--      <version>20.2.0</version>-->

<!--    </dependency>-->

<!--    <dependency>-->

<!--      <groupId>org.graalvm.sdk</groupId>-->

<!--      <artifactId>graal-sdk</artifactId>-->

<!--      <version>20.2.0</version>-->

<!--    </dependency>-->

    <dependency>

      <groupId>org.graalvm.js</groupId>

      <artifactId>js-scriptengine</artifactId>

      <version>20.2.0</version>

    </dependency>

    <dependency>

      <groupId>org.graalvm.js</groupId>

      <artifactId>js</artifactId>

      <version>20.2.0</version>

    </dependency>

  </dependencies>

  <build>

    <!-- Maven Shade Plugin -->

    <finalName>my-expression-app</finalName>

    <plugins>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-shade-plugin</artifactId>

        <version>2.3</version>

        <executions>

          <execution>

            <phase>package</phase>

            <goals>

              <goal>shade</goal>

            </goals>

            <configuration>

              <transformers>

                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

                  <mainClass>Application</mainClass>

                </transformer>

              </transformers>

            </configuration>

          </execution>

        </executions>

      </plugin>

    </plugins>

  </build>

</project>

• application.java
  使用兩種方法一種是polyglot 模式，一種是基於ScriptEngineManager模式的

 import org.graalvm.polyglot.Context;

​

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

​

/**

 @author dalong

*/

public class Application {

​

  public static void main(String[] args) throws ScriptException, NoSuchMethodException {

    // qlExpression();

    method1();

    method2();

   }

​

  public static void method1()  {

    System.out.println("Hello Java!");

    try (Context context = Context.newBuilder().allowAllAccess(true).build()) {

      context.eval("js", "print('Hello JavaScript!');");

      context.eval("js", "let user = {name:\"dalong\",age:333}; print(JSON.stringify(user))");

      java.math.BigDecimal v = context.eval("js",

          "var BigDecimal = Java.type('java.math.BigDecimal');" +

              "BigDecimal.valueOf(10).pow(20)")

           .asHostObject();

      System.out.println(v.toString());

     }

   }

  public static void method2() throws ScriptException, NoSuchMethodException {

   //  注意此處可以直接使用js，因為js-scriptengine 的spi 註冊的時候會自動處理了內建的nashorn

    ScriptEngine eng = new ScriptEngineManager().getEngineByName("js");

    eng.eval("let user = {name:\"dalong\",age:333}; print(JSON.stringify(user))");

   }

}

說明

graalvm js 在效能以及js 支援上是很不錯的，是很值的使用，es4x 就是基於graalvm js的，同時新版本的cratedb也是基於此的

參考資料

https://www.graalvm.org/reference-manual/js/JavaInteroperability/
https://github.com/graalvm/graaljs/blob/master/docs/user/JavaScriptCompatibility.md