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GWT-OpenLayers 3+

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With gwt-ol you can write fast mapping applications for web and mobile in pure Java. Technically speaking, it is a GWT wrapper for OpenLayers 3+ using the JSInterop-Features of the GWT-SDK. The project consists of two parts:

  • a GWT wrapper for OpenLayers 3+ (gwt-ol3-client)
  • a demo module for showing wrapper functionality (gwt-ol3-demo)

You can build (mvn package) and run (mvn gwt:devmode) the application using Maven.

If you want to build the application without Maven please consider the following hints:

  • Building the application with older GWT-SDK than 2.8.0-beta1 will not work. You can download the latest SDK here.

Demo App

GWT-OL live example

Project Setup

Maven dependency


Replace [x.x.x] with the gwt-ol version you want to use.

GWT module

  <inherits name='ol.GwtOL'/>

optional: add this line for proj4js support

  <inherits name="proj4.GwtProj4"/>


  <link href="//[x.x.x]/css/ol.css" rel="stylesheet" type="text/css">
  <script src="//[x.x.x]/build/ol.js" type="text/javascript"></script>

Replace [x.x.x] with the OpenLayers version you want to use.


Releases are deployed to the Central Repository.

Snapshots of the development version are available in Sonatype's snapshots repository.

Projects using gwt-ol

Running Reality
Mapping of Covid19 spread in Italy