Room DataBase not implemented

Question

I am trying out the new Room ORM from googles Android Architecture Components, I followed the documentation but when i run my code i get java.lang.RuntimeException: cannot find implementation for com.zeyad.usecases.app.UserDatabase. UserDatabase_Impl does not exist

Here is my code:

Gradle project:

allprojects {
repositories {
    jcenter()
    maven { url 'https://jitpack.io' }
    maven { url 'https://maven.google.com' }
}
}

Gradle module:

compile "android.arch.lifecycle:runtime:1.0.0-alpha1"
compile "android.arch.lifecycle:extensions:1.0.0-alpha1"
annotationProcessor "android.arch.lifecycle:compiler:1.0.0-alpha1"
compile "android.arch.persistence.room:runtime:1.0.0-alpha1"
annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha1"

User:

@Entity(tableName = "User")
public class User {

    static final String LOGIN = "login";
    private static final String ID = "id", AVATAR_URL = "avatar_url";
    @PrimaryKey
    @SerializedName(LOGIN)
    @ColumnInfo(name = LOGIN)
    String login;

    @SerializedName(ID)
    @ColumnInfo(name = ID)
    int id;

    @SerializedName(AVATAR_URL)
    @ColumnInfo(name = AVATAR_URL)
    String avatarUrl;

    public User() {
    }

    public User(String login, int id, String avatarUrl) {
        this.login = login;
        this.id = id;
        this.avatarUrl = avatarUrl;
    }

    public static boolean isEmpty(User user) {
        return user == null || (user.login == null && user.avatarUrl == null);
    }

    public String getLogin() {
        return login;
    }

    public void setLogin(String login) {
        this.login = login;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getAvatarUrl() {
        return avatarUrl;
    }

    public void setAvatarUrl(String avatarUrl) {
        this.avatarUrl = avatarUrl;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        User user = (User) o;

        return id == user.id && (login != null ? login.equals(user.login) : user.login == null
                && (avatarUrl != null ? avatarUrl.equals(user.avatarUrl) : user.avatarUrl == null));
    }

    @Override
    public int hashCode() {
        int result = login != null ? login.hashCode() : 0;
        result = 31 * result + id;
        result = 31 * result + (avatarUrl != null ? avatarUrl.hashCode() : 0);
        return result;
    }
}

UserDatabase:

@Database(entities = {User.class}, version = 1)
public abstract class UserDatabase extends RoomDatabase {
    public abstract RoomBaseDao roomBaseDao();
}

RoomBaseDao:

@Dao
public interface RoomBaseDao {

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insertItemsReplace(User... objects);

    @Update(onConflict = OnConflictStrategy.REPLACE)
    void updateItemsReplace(User... objects);

    @Delete
    void deleteItem(User object);
}

Application onCreate:

UserDatabase gDb = Room.databaseBuilder(this, UserDatabase.class, "test-db").build(); // throws the exception above

Thanks in advance.

It feels like the code is not getting generated as expected. Did you include both dependencies in your `build.gradle` file? — CommonsWare, May 24 '17 at 15:51
OK, that looks fine. If you go into your module's `build/generated/source/` directory, do you see an `apt/debug/` directory with your `UserDatabase_Impl.java` and `RoomBaseDao_Impl.java` classes (in the appropriate Java package)? — CommonsWare, May 24 '17 at 17:43
That's the crux of the issue, then. Assuming that cleaning and rebuilding the project does not help, check your Gradle Console and see if there are any messages from the annotation processor that might explain why your code is not being generated. — CommonsWare, May 24 '17 at 18:59
yea cleaning the project and rebuilding doesnt solve, so what i can do now ? — Zeyad Gasser, May 24 '17 at 19:32
As I wrote, check your Gradle Console and see if there are any messages from the annotation processor that might explain why your code is not being generated. — CommonsWare, May 24 '17 at 19:35
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/145064/discussion-between-zeyad-gasser-and-commonsware). — Zeyad Gasser, May 24 '17 at 19:37

score 5 · Accepted Answer · answered May 25 '17 at 12:28

5

In my case I was using old version of ButterKnife which required android-apt plugin. So I updated ButterKnife (which now uses annotation processor) and removed plugin declaration in Gradle file.

Probably that was not exactly your problem, but maybe it will help others.

answered May 25 '17 at 12:28

Nominalista

4,632
11
43
102

turns out i was still using android-apt and when i removed it, everything is working fine now. – Zeyad Gasser May 25 '17 at 16:38
I'm glad to help. – Nominalista May 25 '17 at 16:59

score 0 · Answer 2 · answered Jun 22 '17 at 15:31

0

Another thing which may cause the problem:

configurations.all {
  resolutionStrategy {
    force "com.android.support:support-annotations:$SUPPORT_LIBRARY_VERSION"
  }
}

answered Jun 22 '17 at 15:31

IvBaranov

540
2
10
24

Room DataBase not implemented

2 Answers2