the result is the same String.Companion `Type mism...

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[rrader]

the result is the same String.Companion
Type mismatch: inferred type is String.Companion but String was expected

[diesieben07]

inline fun <reified T : Any> NamedParameterJdbcTemplate.queryForKObject(sql: String, parameters: Map<String, *>): T {
    return this.queryForObject(sql, parameters, T::class.java)
}

[rrader]

thanks
the final code

inline fun <reified T : Any?> NamedParameterJdbcTemplate.queryForKObject(sql: String, parameters: Map<String, *>): T {
    return this.queryForObject(sql, parameters, T::class.java) as T
}

and the call
jdbcTemplate.queryForKObject<String>(sql, parameters)

[diesieben07]

Why are you casting to T?

[rrader]

because queryForObject have @Nullable

[rrader]

so kotlin compiler emit warning

[diesieben07]

Then you should handle the nullable

[diesieben07]

And not just cast it, then you're back to Java's NPEs

[rrader]

but I know for sure that it can not be null, checks are done before the call

[diesieben07]

Then caller of queryForKObject should cast, not queryForKObject

[rrader]

queryForKObject is just a wrapper to not have long calls
now it is jdbcTemplate.queryForKObject<String>(sql, parameters), was jdbcTemplate.queryForObject<String>(sql, parameters, String::class.java) as String

[rrader]

I need to duplicate type twice in old version

[Pavlo Liapota]

I guess you can write !! instead of as T.