I've recently started expirementing with Kotlin and started a Spring Boot pet project using Kotlin.
I'm trying to integrate a custom User domain object to Spring Security and thus want to implement the UserDetails inteface.
Given my domain User object below:
import org.springframework.data.annotation.Id as DocumentId
import org.springframework.data.mongodb.core.mapping.Document
import org.springframework.security.core.GrantedAuthority
import org.springframework.security.core.authority.AuthorityUtils
import org.springframework.security.core.userdetails.UserDetails
@Document
data class User(@DocumentId val id: String? = null,
val username: String = "",
val password: String = "",
val email: String = "",
val name: String? = null,
val surname: String? = null) : UserDetails {
override fun isCredentialsNonExpired(): Boolean = true
override fun isAccountNonExpired(): Boolean = true
override fun isAccountNonLocked(): Boolean = true
override fun getAuthorities(): MutableCollection<out GrantedAuthority> = AuthorityUtils.createAuthorityList("USER")
override fun isEnabled(): Boolean = true
}
I get the following errors:
Accidental override: The following declarations have the same JVM signature (getUsername()Ljava/lang/String;): public final fun < get-username>(): Kotlin.String, public abstract fun getUsername(): Kotlin.String!
Accidental override: The following declarations have the same JVM signature (getPassword()Ljava/lang/String;): public final fun < get-password>(): Kotlin.String, public abstract fun getPassword(): Kotlin.String!
Since my User class already has a method getUsername(): Kotlin.String also implement the method getUsername(): Kotlin.String! ?
How am I supposed to resolve such an error, other than using the @JvmName on the property's getter and setter?
The problem here is that it's impossible for a property getter to override a function from a supertype, from Kotlin's point of view. To workaround it, you can prevent the compiler from generating getters by making your properties private
and implement required methods from supertypes manually, for example:
data class User(
private val username: String = ""
...
): UserDetails {
override fun getUsername() = username
...
}
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