gradle build for kotlin code - gradle

Question

I'm trying to set up a project building Kotlin code with Gradle. I've followed instructions here on how to set up the build.gradle file but am receiving an error
buildscript {
repositories {
mavenCentral()
jcenter()
}
dependencies {
classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.0'
}
}
apply plugin: 'kotlin'
With this I get the error:
FAILURE: Build failed with an exception.
What went wrong:
A problem occurred configuring root project 'kjsonparser'.
Could not resolve all files for configuration ':classpath'.
Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.0.
Required by:
project :
Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.0.
Could not get resource 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.0/kotlin-gradle-plugin-1.2.0.pom'.
Could not GET 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.0/kotlin-gradle-plugin-1.2.0.pom'.
java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
I've also tried the "newer" way of specifing the plugin
plugins {
id "org.jetbrains.kotlin.jvm" version "1.2.0"
}
Which gives this error:
What went wrong:
Plugin [id: 'org.jetbrains.kotlin.jvm', version: '1.2.0'] was not found in any >of the following sources:
Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact >'org.jetbrains.kotlin.jvm:org.jetbrains.kotlin.jvm.gradle.plugin:1.2.0')
Searched in the following repositories:
Gradle Central Plugin Repository
Version of Gradle
gradle -version
------------------------------------------------------------
Gradle 4.4
Kotlin (and openjdk)
kotlin -version
Kotlin version 1.2.0 (JRE 1.8.0_151-8u151-b12-0ubuntu0.17.10.2-b12)
Running on Ubuntu 17.10
I've never worked with Gradle before so not sure if I'm missing anything in the build file

Answer 1

Try this. It works:
buildscript {
ext.kotlin_version = '1.2.10'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'kotlin'
repositories {
mavenCentral()
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}

Answer 2

I never use the buildscript block.
Try this instead:
plugins {
id 'java'
id 'org.jetbrains.kotlin.jvm' version '1.4.31'
}
repositories {
mavenCentral()
jcenter()
}
dependencies {
implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.4.31'
}