nashorn

I am really stuck at this now.. Essentially I have a Java Map, which I would like to pass it to a Javascript Code, so that in my JS code I can use dot notation to refer the keys in this Map. ( I know I can serialize the map into JSON and deserialize it back and pass it into JS, but I don't like that ) I have this piece of the unit code @Test public void mapToJsTest() throws Exception{ Map m = Maps.newHashMap(); m.put("name", "john"); NativeObject nobj = new NativeObject(); for (Object k : m.keySet()) { nobj.defineProperty((String)k, m.get(k), NativeObject.READONLY); } engine.eval("function

I have a Java object that I want to turn into a json object and pass to the Nashorn javascript engine. It is surprisingly difficult to google an answer for this! Can someone tell me how to do it? I tried this: ObjectMapper mapper = new ObjectMapper(); String inputModelAsString = mapper.writeValueAsString(inputModel); And then passing the string json to the function: result = invocable.invokeFunction(PROGRAM_FUNCTION, moduleName, inputModelAsString); But it was passed as a string, not as a json. You can convert json from engine by ScriptEngine engine = new ScriptEngineManager().getEngineByName(

If I have a JS function that returns an array of strings, how should I go about casting it to a useful type (I'm thinking either a Java array or Collection class)? I've noticed that the return type is always a ScriptObjectMirror which has an interesting to(Class<?> clazz) method, but I'm uncertain on it's use. I've checked several other StackOverflow questions, but none were useful. Can you show an example? Ok this worked for me: ScriptObjectMirror result = (ScriptObjectMirror) function.invokeFunction("nameGen", 10); String[] strings = result.to(String[].class); 来源： https://stackoverflow.com

Nashron Release notes claims they fixed the JSON parser bugs, but I am still able to produce a (different) bug on new patch 8u60. This time it is OutOfMemoryError. Refer the attached JSON [1] (it is typically a Category & Subcategory relation). When I try to invoke JSON.parse() it is failing. [1] http://jsfiddle.net/manivannandsekaran/rfftavkz/ I tried to increase the heap size, didn't help, instead of getting the OOM Exception quickly, it delayed bit. When I replace all the integer key with Alpahnumberic, the entire parsing time is super fast. [2] [2] https://jsfiddle.net/manivannandsekaran