I can recommend this library: https://github.com/branflake2267/GWT-Maps-V3-Api
Here is a showcase of features: http://gonevertical-apis.appspot.com/
If you scroll down there is an example with autocomplete with places.
Here is the code for autocomplete example: https://github.com/branflake2267/GWT-Maps-V3-Api/blob/master/gwt-maps-showcase/src/main/java/com/google/gwt/maps/testing/client/maps/AutocompletePlacesMapWidget.java
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