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Java 15

移除 Nashorn JavaScript Engine

https://openjdk.java.net/projects/jdk/15/

339: Edwards-Curve Digital Signature Algorithm (EdDSA) 360: Sealed Classes (Preview) 371: Hidden Classes 372: 移除 Nashorn JavaScript Engine 可以使用 GraalvmJS 373: Reimplement the Legacy DatagramSocket API 374: Disable and Deprecate Biased Locking 375: Pattern Matching for instanceof (Second Preview) 377: ZGC: A Scalable Low-Latency Garbage Collector 378: Text Blocks 379: Shenandoah: A Low-Pause-Time Garbage Collector 381: Remove the Solaris and SPARC Ports 383: Foreign-Memory Access API (Second Incubator) 384: Records (Second Preview) 385: Deprecate RMI Activation for Removal

2020/09/15 General Availability

JavaScript Engine 迁移​

GraalvmJS 依赖

<dependency>
  <groupId>org.graalvm.js</groupId>
  <artifactId>js</artifactId>
  <version>20.0.0</version>
</dependency>
<dependency>
  <groupId>org.graalvm.js</groupId>
  <artifactId>js-scriptengine</artifactId>
  <version>20.0.0</version>
</dependency>

调用

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class Simple {

  public static void main(String[] args) throws ScriptException {
    // Nashorn
    ScriptEngine nashornEngine = new ScriptEngineManager().getEngineByName("nashorn");
    nashornEngine.eval("print('Hello World!');");

    // Graal
    ScriptEngine graalEngine = new ScriptEngineManager().getEngineByName("graal.js");
    graalEngine.eval("print('Hello World!');");
  }
}