Has anyone seen a bug on type inference for java c...

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[ehonsey]

Has anyone seen a bug on type inference for java classes with same short names? I don't want to file a duplicate bug. However I had an issue assigning a field with type of java.sql.Date. Although I have an import for that class in the calling class, when I call Date.from(Instant) the compiler is inferring java.util.Date instead of java.sql.Date. I had to give a type hint. I would have expected the compiler to make this inference based on the type of the target field.

[ilya.gorbunov]

ehonsey: Could you post a small code example to reproduce that?

[ehonsey]

import java.sql.Date
import java.time.Instant

class SqlDateWrapper(sqlDate: Date)

fun typeInferenceError() {
    val wrapper = SqlDateWrapper(Date.from(Instant.now()))
}

[ehonsey]

The class takes a type of java.sql.Date, but my IntelliJ is showing a compiler error on Date.from. My original Kotlin compiler version was 1.0.4. However, the same error showed on 1.0.6

[ehonsey]

Actually, that might not be an error. I thought java.sql.Date had an override for that method, but it is actually part of the superclass java.util.Date. So the compiler is acting normally in this case. I don't think this is an issue. Sorry for the red herring

[ilya.gorbunov]

java.sql.Date extends java.util.Date. There is no static from method in JDK, that returns java.sql.Date, only the one that returns java.util.Date. So when you call java.sql.Date.from, you actually refer to java.util.Date.from, and thus you get java.util.Date as a result.

[ilya.gorbunov]

I wonder who designed this API mess 🙄

[ehonsey]

Right? I just realized how difficult it is to go from an java.time.Instant to a java.sql.Date for my JPA entity. Ugh

[ehonsey]

Thank you for your assistance, by the way 👍