Re: JsInterop - fail to iterate @JsType in List

Thanks @Jens

So I added namespace = JsPackage.GLOBAL as suggested:

package com.project.client;

import jsinterop.annotations.JsPackage;

import jsinterop.annotations.JsProperty;

import jsinterop.annotations.JsType;

@JsType(isNative = true, namespace = JsPackage.GLOBAL)

public class Car {

 @JsProperty(namespace = JsPackage.GLOBAL) public static Car car;

  public native String start();

}

But the new stacktrace is:

SEVERE:

java.lang.ClassCastException

  at Unknown.xk_g$(Throwable.java:69)

  at Unknown.el_g$(Exception.java:29)

  at Unknown.ml_g$(RuntimeException.java:29)

  at Unknown.BXe_g$(ClassCastException.java:27)

  at Unknown.dyg_g$(InternalPreconditions.java:154)

  at Unknown.pyg_g$(InternalPreconditions.java:138)

  at Unknown.oyg_g$(InternalPreconditions.java:133)

  at Unknown.c9c_g$(Cast.java:155)

  at Unknown.ose_g$(App.java:74)

  at Unknown.Fse_g$(App.java:66)

  at Unknown.rfb_g$(SchedulerImpl.java:50)

  at Unknown.Xeb_g$(SchedulerImpl.java:183)

  at Unknown.Seb_g$(SchedulerImpl.java:347)

  at Unknown.jfb_g$(SchedulerImpl.java:78)

  at Unknown.Peb_g$(SchedulerImpl.java:141)

  at Unknown.ydb_g$(Impl.java:309)

  at Unknown.Bdb_g$(Impl.java:361)

  at Unknown.anonymous(Impl.java:78)

Other ideas?


On Tuesday, May 12, 2020 at 7:14:33 PM UTC+10, Jens wrote:

I am not 100% sure since I have not used JsInterop for a long time now but I would imagine the following:

Currently GWT will think that your native JS class "Car" is located at com.project.client namespace because that is the package it lives in and you have not provided a namespace to @JsType.

You can access the static car field because you have added the global namespace to @JsProperty and your custom JS has created a car field in that global namespace. In your for-loop I am relatively sure that GWT will try to verify that your Java list contains actual JS Cars so the generated JS will somewhere contain "$wnd.com.project.client.Car" which is undefined since your JS did not define it (you have defined everything in the global space, including the class itself)

So you should use @JsType(isNative = true, namespace = JsPackage.GLOBAL) on your Car class to tell GWT to use $wnd.Car since that is the location where you have defined that class in JS.

-- J.

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