Android Room 数据库忽略问题“尝试了以下构造函数，但它们无法匹配”

我的实体类：

@Entity(tableName = "student")
data class Student(
    var name: String,  
    var age: Int,   
    var gpa: Double,
    var isSingle: Boolean,

    @PrimaryKey(autoGenerate = true)
    var id: Long = 0,    

    @Ignore                           //don't create column in database, just for run time use
    var isSelected: Boolean = false                     
)

然后我像这样插入（测试过androidTest):

val student = Student("Sam", 27, 3.5, true)

studentDao.insert(student)

添加后立即出现此错误@Ignore注解：

C:\Android Project\RoomTest\app\build\tmp\kapt3\stubs\debug\com\example\roomtest\database\Student.java:7: ����: Entities and POJOs must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).
public final class Student {
         ^
  Tried the following constructors but they failed to match:
  Student(java.lang.String,int,double,boolean,boolean,long) -> [param:name -> 
matched field:name, param:age -> matched field:age, param:gpa -> matched 
field:gpa, param:isSingle -> matched field:isSingle, param:isSelected -> 
matched field:unmatched, param:id -> matched field:id][WARN] Incremental 
annotation processing requested, but support is disabled because the 
following processors are not incremental: androidx.room.RoomProcessor 
(DYNAMIC).

由于 Room 在编译期间仍然生成 Java 类，并且问题出在默认值参数上，因此尝试使用@JvmOverloads https://kotlinlang.org/docs/reference/java-to-kotlin-interop.html#overloads-generation对于构造函数：

@Entity(tableName = "student")
data class Student @JvmOverloads constructor(
    var name: String,
    .....  

UPDATE

有趣的是在文档中 https://developer.android.com/training/data-storage/room/defining-data#ignore没有提及对此案进行特殊处理。和这个问题 https://issuetracker.google.com/issues/154420356已经存在用于修复此文档。

From 这个问题 https://issuetracker.google.com/issues/70762008至于问题本身，结论是：

使用 @JvmOverloads 应该可以。在不远的将来有一天，我们可能会生成 Kotlin，这将不再是问题