我试图在服务器上从Java 8(Nashorn引擎)渲染GraveVz,但是我得到了错误:
Exception in thread "main" javax.script.ScriptException: ReferenceError: "Promise" is not defined in <eval> at line number 120
at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:455)
at jdk.nashorn.api.scripting.NashornScriptEngine.invokeImpl(NashornScriptEngine.java:387)
at jdk.nashorn.api.scripting.NashornScriptEngine.invokeMethod(NashornScriptEngine.java:196)
at test1.VizDemo.main(VizDemo.java:24)
Caused by: <eval>:120 ReferenceError: "Promise" is not defined
这是迄今为止我的(简单)程序:
import java.io.InputStreamReader;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
public class VizDemo {
public static void main(String args[]) throws Exception {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
engine.eval(new InputStreamReader(VizDemo.class.getResourceAsStream(
"./viz.js")));
engine.eval(new InputStreamReader(VizDemo.class.getResourceAsStream(
"./full.render.js")));
Object v = engine.eval("new Viz();");
System.out.println("v=" + v);
if (engine instanceof Invocable) {
Invocable invEngine = (Invocable) engine;
Object result = invEngine.invokeMethod(v, "renderSVGElement",
"digraph { a -> b; a -> c; }");
System.out.println("result=" + result);
}
}
}
我错过了什么?或者…在Java 8中运行JavaScript实际上是可能的吗?