Android Room: room Entity class must be annotated with @Entity

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If you run into the following error you probably provide a class that is either not correctly annotated or shouldn’t be there.

room Entity class must be annotated with @Entity

1	room Entity class must be annotated with @Entity

The source of this problem usually can be found by looking at your database class, the example code is in Kotlin but should also apply to Java:

@Database(entities = arrayOf(User::class, Expense::class), version = 1)
abstract class MyDatabase : RoomDatabase() {

    // --- DAO ---
    abstract fun userDao(): UserDao

    // --- DAO ---
    abstract fun expenseDao(): ExpenseDao

}

@Database(entities = arrayOf(User::class, Expense::class), version = 1)

abstract class MyDatabase : RoomDatabase() {

// --- DAO ---

abstract fun userDao(): UserDao

// --- DAO ---

abstract fun expenseDao(): ExpenseDao

}

Now make sure, that any referenced class in the @Database annotation in line 1 is annotated with @Entity.

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Android Room: room Entity class must be annotated with @Entity

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