Code Validation and Quick Fixes for Endpoints Backends

Server-side Endpoints API definitions must conform to a number of syntactic rules. Android Studio knows these and validates your code as you type to help you avoid making mistakes. Android Studio provides Endpoints-specific inspections and quick-fixes.

As-you-type code validation

For example, the default backend type App Engine Java Endpoints Module contains the following minimal annotated Endpoints API located in your project at <backend-name>/src/main/java/<package-name>/

    import javax.inject.Named;

    @Api(name = "myApi", version = "v1",
         namespace = @ApiNamespace(ownerDomain = "<package-name>",
                                   ownerName = "<package-name>",
    public class MyEndpoint {
        @ApiMethod(name = "sayHi")
        public MyBean sayHi(@Named("name") String name) {
          MyBean response = new MyBean();
          response.setData("Hi, " + name);

          return response;

In the code, @Named is required for all non-entity type parameters passed to server-side methods. If you forget to add this annotation when modifying sayHi in this code, Android Studio will underline the problematic statement as you type, as shown below:

Add Backend

Quick fixes

To help you avoid some of the more common Cloud Endpoints development mistakes, Android Studio provides quick fixes. To see these quick fix suggestions, press Alt + Enter if you’re running on Linux/Windows, or + Enter if you’re running on a Mac. For example, here is Android Studio displaying a quick fix for the missing @Named annotation shown in the above code sample:

Add Backend

As expected, choosing the first quick fix (Add @Named) adds @Named to the method parameter.