[FIXED] Error: Type of the parameter must be a class annotated with @Entity or a collection/array

Issue

I know that some have already posted this topic but after reviewed all the given answer, I can not find anything suit my case. I would be happy if someone can help me resolving my case.

I started getting my build failed as I've updated my Kotlin lib from 1.5.31 to 1.6.0. My Android Room BaseDao class can’t be compiled again. Below my BaseDao class:

interface BaseDao<T> {
    /**
     * Insert an object in the database.
     *
     */
    @Insert(onConflict = OnConflictStrategy.IGNORE)
    suspend fun insert(obj: T): Long

    /**
     * Insert an array of objects in the database.
     *
     * @param obj the objects to be inserted.
     */
    @Insert
    suspend fun insert(vararg obj: T): LongArray

    /**
     * Update an object from the database.
     *
     * @param obj the object to be updated
     */
    @Update(onConflict = OnConflictStrategy.REPLACE)
    suspend fun update(obj: T)

    /**
     * Delete an object from the database
     *
     * @param obj the object to be deleted
     */
    @Delete
    suspend fun delete(obj: T)
}

@Transaction
suspend inline fun <reified T> BaseDao<T>.insertOrUpdate(item: T) {
    if (insert(item) != -1L) return
    update(item)
}

After build:

BaseDao.java:19: error: Type of the parameter must be a class annotated with @Entity or a collection/array of it.
kotlin.coroutines.Continuation<? super java.lang.Long> continuation);
error: Not sure how to handle insert method’s return type.
public abstract java.lang.Object insert(T obj, @org.jetbrains.annotations.NotNull()

This is how i call my BaseDao in one of my Dao class:

@Dao
interface CustomDao : BaseDao<CustomEntity> {
   
}

I've tried @JvmSuppressWildcards but it doesn't help me.

Solution

I've finally found a solution to update Kotlin from 1.5.31 to 1.6.10 and my room version from 2.3.0 to 2.4.0.

The error I was getting, comes from a function I wrote in the embedded data class, as soon as I removed it then everything works.

@Entity(primaryKeys = ["device_id"],)
data class DetailedDataEntity(
    @ColumnInfo(name = "device_id", index = true)
    var deviceId: String,

    @ColumnInfo(name = "unix_timestamp")
    var unixTimestamp: Long,

    @Embedded(prefix = "data_")
    var data: DetailedData
)


data class DetailedData( @ColumnInfo(name = "nameFx") val nameFx: String) {
    companion object {
        @Ignore
        fun fromData(detailedData: Protobuf.Data): DetailedData {
            return DetailedData(nameFx = detailedData.nameFx)
        }
    }
}

    companion object {
         @Ignore
         fun fromData(detailedData: Protobuf.Data): DetailedData {
             return DetailedData(nameFx = detailedData.nameFx)
         }
    }

I've removed this companion object and then when I build the project, it's successfully passed. honestly, I do not know why this but I think it must have something to do with Google protobuf message associated with my embedded class.

Answered By - K. Donon
Answer Checked By - Gilberto Lyons (JavaFixing Admin)