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! ;)
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 $wnd.JSON.stringify(obj);
}-*/;
@JsType
public static class MyData {
public String name;
public int age;
public MyData(String name, int age) {
this.name = name;
this.age = age;
}
}
}
On startup this does indeed output {"name":"Colin","age":123}, though if
you remove the @JsType annotation, it just outputs {} since GWT doesnt see
any code using the fields, so it optimizes them out.
Live code:
https://viola.colinalworth.com/proj/1975c89afc330c0bb55d8fd7d4001fd1/project/client/SampleEntryPoint.java
This is however using a version of GWT 2.8 that is a few weeks old, I'll
update later today and reverify.
On Tue, May 19, 2015 at 12:11 AM Alex W <alexwhite3...@gmail.com> wrote:
> The '_1_g$' 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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