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I am trying to execute Javascript code from Java. Javascript code uses jquery so I prepend the jquery.js before my code. But it throws following exception,

Exception in thread "main" javax.script.ScriptException: sun.org.mozilla.javascript.internal.EcmaError: ReferenceError: "window" is not defined. (<Unknown source>#1) in <Unknown source> at line number 1

As I run this from the Java code, I understand that it does not have access to the window object so above exception. I found that EnvJs provides the implementation for the required environment so I tried to load that first by putting its content first while generating the script content to eval. But run into following exception,

Exception in thread "main" javax.script.ScriptException: sun.org.mozilla.javascript.internal.EcmaError: TypeError: Cannot call property getCurrentContext in object [JavaPackage org.mozilla.javascript.Context]. It is not a function, it is "object". (<Unknown source>#1247) in <Unknown source> at line number 1247


Following is the code snippet,

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");

String script = "Envjs code" + "jQuery code" + "my java script"; //code of envjs + jquery from the link provided at the end
engine.eval(script);

Invocable inv = (Invocable) engine;
inv.invokeFunction("myFunc", obj1, obj2);


I do not use any browser features so do not require object's like window. So ideally I do not want to load Envjs. Please let me know how to load jQuery code.


One more question - How to pass Json Object from Java code to Javascript function as parameter?


http://www.envjs.com/dist/env.rhino.1.2.js
http://code.jquery.com/jquery-1.9.0.min.js

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1 Answer

up vote 0 down vote

don't known about Envjs, but why simulate a browser environment in java?

for the second question:

ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");
Compilable compilable = (Compilable) engine;
Bindings bindings = engine.createBindings(); 
String script = "function add(op1,op2){return op1+op2} add(a, b)"; 
CompiledScript jsFunction = compilable.compile(script);
bindings.put("a", 1);bindings.put("b", 2); //put java object into js runtime environment
Object result = jsFunction.eval(bindings);
System.out.println(result);

you can put whatever object into the bindings, a map, a list, or a pojo.

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