房间错误。ColumnInfo不定义元素collate()

Question

在我的安卓应用程序中，我正在使用google ROOM lib来创建sqlite数据库。

我用不同的控制器(用户定义)在我的单个应用程序中创建了两个数据库。

下面是我实现的代码

数据库1 :

@Database(entities = {JobTable.class}, version = 1)
public abstract class JobRoomController extends RoomDatabase
{

public static JobRoomController controller;
public abstract JobTable jobTable();


    public static JobRoomController database(Context context)
    {
        if(controller == null)
        {
            controller =    Room.databaseBuilder(context.getApplicationContext(),
                    JobRoomController.class, "Job")
                    .allowMainThreadQueries()
                    .build();
        }

        return controller;

    }

    @Override
    protected SupportSQLiteOpenHelper createOpenHelper(DatabaseConfiguration config) {
        return null;
    }

    @Override
    protected InvalidationTracker createInvalidationTracker() {
        return null;
    }

}

数据库2:

@Database(entities = {DbTrackServer.class,DbGpsStatus.class}, version = 1)
public abstract class RoomControl extends RoomDatabase {




   public abstract IGpsStatus gpsStatus();
   public abstract ITrack track();
   private static RoomControl roomControl;
   public static RoomControl database(Context context)
   {
     if(roomControl == null)
       {
        roomControl =    Room.databaseBuilder(context.getApplicationContext(),
                            RoomControl.class, "mobileTracker")
                           .allowMainThreadQueries()
                           .build();
       }

       return roomControl;

   }
  @Override
    protected SupportSQLiteOpenHelper createOpenHelper(DatabaseConfiguration config) {
        return null;
    }

    @Override
    protected InvalidationTracker createInvalidationTracker() {
        return null;
    }
}

但是当我构建我的项目时，它显示的是gradle错误。

**Error:任务执行失败“：app:compileDebugJavaWithJavac‘。

java.lang.IllegalArgumentException：@android.arch.persistence.room.ColumnInfo没有定义元素collate()**

Answer 1

--我通过从gradle文件中更新Room Lib来解决这个问题。