JSON.stringify will try to serialize the js objects to a json string as best it can (ignoring cycles, and non-json data like methods).
At the risk of sounding snarky, you know that class won't work in JsInterop, right? For a start, its missing its @JsType! ;)
At the risk of sounding snarky, you know that class won't work in JsInterop, right? For a start, its missing its @JsType! ;)
Next, some of these fields can't cleanly be passed between Java and JS - for example JS has no long type (will truncate to double precision, GWT emulates long), and a Java List<?> needs to be a type that exists in JS (either JsArray, or some jsinterop-annotated type that maps to what JS understands). This I'm less sure about, but at least historically boxed types like Boolean were never supported - the primitive type boolean has to be used instead.
Here's a very quick sanity check that I wrote to verify that this is working more or less as expected:
public class SampleEntryPoint implements EntryPoint {
public void onModuleLoad() {
MyData data = new MyData("Colin", 123);
Window.alert(stringify(data));
}
public static native String stringify(Object obj) /*-{
return $wnd.JSON.stringify(obj);
}-*/;
@JsType
public static class MyData {
public String name;
public int age;
public MyData(String name, int age) {
this.name = name;
this.age = age;
}
}
}
On startup this does indeed output {"name":"Colin","age":123}, though if you remove the @JsType annotation, it just outputs {} since GWT doesnt see any code using the fields, so it optimizes them out.
Live code:
This is however using a version of GWT 2.8 that is a few weeks old, I'll update later today and reverify.
On Tue, May 19, 2015 at 12:11 AM Alex W <alexwhite3000@gmail.com> wrote:
-- The '_1_g$' indicates you are in super dev mode - does it work correctly when fully compiled to JS (draft or no)? I saw a problem in this area a few weeks ago.No it doesn't work when it's fully compiled to JS either.Also, can you post the full definition for MyObject?class MyObject {
private String str1;
private String str2;
private boolean b1;
private boolean b2;
private boolean b3;
private boolean b4;
private boolean b5;
private boolean b6;
private int size;
private String str3;
private Boolean b7;
private String str4;
private int numb1;
private long uid;
private Boolean b7;
private List<MyOtherObject> objs;
}I agree with Alberto though, your printObj doesn't make any sense as is - it is calling the java toString() method on the object rather than serializing to JSON, or do you expect MyObject.toString() to return a json string?I thought JSON.stringify(...) would stringify the (assumed) JSON object. I'm not really sure what's going on under the hood, but I don't really understand why/how it doesn't.--
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