How to use JsInterop in GWT

Hi, 

I just started playing with Gwt and want to try JsInterop.

This is very important feature for me. 

I have a big part of java 8 code needs to be translated to JavaScript.

I copied a demo project which is working by default.

My problem appeared after I defined a simple POJO class annotated with @JsType. 

Intellij Idea sees the annotation type in the project, but building fails with error that annotation class is undefined.

GWT version 2.8.1. 

GWT maven plugin is gwt-maven-plugin 1.0-rc-8.

Compiler options are:

  <compilerArgs>       <compileArg>-XjsInteropMode</compileArg>       <compileArg>-generateJsInteropExports</compileArg>       <compileArg>JS</compileArg>    </compilerArgs>

[ERROR] COMPILATION ERROR : 

[INFO] -------------------------------------------------------------  [ERROR] /home/egnyte/demo/gwt/StockWatcherSample-master/src/main/java/de/google/gwt/stockwatcher/client/sub/Mesage.java:[5,37] package com.google.gwt.core.client.js does not exist  [ERROR] /home/egnyte/demo/gwt/StockWatcherSample-master/src/main/java/de/google/gwt/stockwatcher/client/sub/Mesage.java:[7,2] cannot find symbol    symbol: class JsType  [INFO] 2 errors   [INFO] -------------------------------------------------------------  [INFO] ------------------------------------------------------------------------  [INFO] BUILD FAILURE  [INFO] ------------------------------------------------------------------------  [INFO] Total time: 3.119 s  [INFO] Finished at: 2017-10-06T16:09:52+02:00  [INFO] Final Memory: 21M/258M  [INFO] ------------------------------------------------------------------------  [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project stockwatcher: Compilation failure: Compilation failure:  [ERROR] /home/egnyte/demo/gwt/StockWatcherSample-master/src/main/java/de/google/gwt/stockwatcher/client/sub/Mesage.java:[5,37] package com.google.gwt.core.client.js does not exist  [ERROR] /home/egnyte/demo/gwt/StockWatcherSample-master/src/main/java/de/google/gwt/stockwatcher/client/sub/Mesage.java:[7,2] cannot find symbol  [ERROR] symbol: class JsType

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