is there something to tell the Java to Kotlin converter in Intellij that some fields are non-nullabl...

# intellij

[Pacane]

is there something to tell the Java to Kotlin converter in Intellij that some fields are non-nullable, so that the converter doesn't make everything nullable by default? I tried adding some @NotNull annotations on fields/construction parameters, but the converter still makes everything nullable

[Ilya Kirillov [JB]]

This looks like https://youtrack.jetbrains.com/issue/KT-34987 which is fixed in 1.3.61. Which version of Kotlin plugin do you use?

[Pacane]

1.3.61

[Pacane]

IntelliJ IDEA 2019.3 (Ultimate Edition)
Build #IU-193.5233.102, built on November 27, 2019

[Ilya Kirillov [JB]]

Just checked on 1.3.61:

import org.jetbrains.annotations.NotNull;

public class Test {
    void Test(@NotNull String notNullParam) {}
}

generates:

class Test internal constructor(notNullParam: String)

Could you please provide me with reproducible example?

[Pacane]

sure 1s

[Pacane]

It seems to be happening with an abstract class extending another class

[Pacane]

trying to get a minimal reproducible case

[Pacane]

This is B.java

package com.bitboxusa.core.abstractions.eventbus;

import org.jetbrains.annotations.NotNull;

public class B {
  @NotNull protected final Integer b;

  B(@NotNull Integer b) {
    this.b = b;
  }
}

This is A.java

package com.bitboxusa.core.abstractions.eventbus;

import org.jetbrains.annotations.NotNull;

public abstract class A extends B {
  public A(@NotNull Integer some) {
    super(some);
  }
}

I'm only converting A.java to Kotlin so far

[Pacane]

ending up with

package com.bitboxusa.core.abstractions.eventbus

import org.jetbrains.annotations.NotNull

abstract class A(some: @NotNull Int?) : B(some!!)

[Pacane]

I'm going through this progressive migration

[Ilya Kirillov [JB]]

Still getting valid result for you example:

abstract class A(some: Int) : B(some)

[Ilya Kirillov [JB]]

As a temporary solution, you can try use old version of J2K, which can be enabled by disabling Settings -> Languages & Fraameworks -> Kotilin -> Use New Java to Kotlin Conversion

[Pacane]

I'll try that, ty