IssueTracker

Component used: Room
Version used: either 1.0.0 or 1.1.0-alpha2
Devices/Android versions reproduced on: n/a

The Room compiler does not support two @Dao classes with the same simple name and same package. This would occur if you have two static @Dao classes:

@Entity
public class GoodThingy {
  @PrimaryKey int id;
  public String something;

  @Dao
  public static abstract class Store {
    @Query("SELECT * FROM GoodThingy")
    public abstract List<GoodThingy> all();
  }
}

@Entity
public class BadThingy {
  @PrimaryKey int id;
  public String something;

  @Dao
  public static abstract class Store {
    @Query("SELECT * FROM BadThingy")
    abstract List<BadThingy> all();
  }
}

The code generator tries generating Store_Impl.java for each of those, and that fails with:

Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> javax.annotation.processing.FilerException: Attempt to recreate a file for type com.commonsware.abstractroombug.Store_Impl

The workaround is to name each static @Dao something different (e.g., GoodStore, BadStore).

IMHO, ideally either:

- Using the same name is supported, by generating distinct Java classes for each (e.g., GoodThingy_Store_Impl.java, BadThingy_Store_Impl.java), or

- This limitation is documented, or

- The error message be more specific, indicating that this sort of thing is the source of the trouble (as "Attempt to recreate a file" may not be intuitively obvious to developers)

The code shown above is from the attached project that reproduces the problem. The project right now is set for 1.1.0-alpha2, but the same problem exists with 1.0.0.