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1. Create two java interfaces XXXService.java and and XXXServiceAsync.java in org.sagebionetworks.web.client.services where XXX is the name of your service.
   1. ex: DatasetService.java and DatasetServiceAsync.java
2. In the XXXService interface, add the service's relative web path via the @RemoteServiceRelativePath annotation
   1. ex: @RemoteServiceRelativePath("dataset")
3.  Create a class on the server side of the GWT project (in org.sagebionetworks.web.server.servlet) called XXXServiceImpl.java. It should extend RemoveServiceServlet and implement your XXXService interface.
   1. ex: DatasetServiceImpl.java
4. Write a test for your ServiceImpl.
   1. ex: DatasetServiceImplTest.java