Show UTF-8 text properly in Gradle

The file.encoding system property needs to be set right when the JVM executing the Gradle build (e.g. the Gradle Daemon) starts up. One way to achieve this is with export GRADLE_OPTS="-Dfile.encoding=utf-8". Another way that might work is to add systemProp.file.encoding=utf-8 to gradle.properties. Of course this assumes that the build script files are actually using utf-8 encoding. To see what your platform's (and therefore Gradle's) default encoding is, print out the system property's value in a build script.

In gradle.properties

org.gradle.jvmargs='-Dfile.encoding=UTF-8'

I use next setting in build.gradle and it works fine for me:

compileJava.options.encoding = 'UTF-8'

tasks.withType(JavaCompile) {
    options.encoding = 'UTF-8'
}

if you're using kotlin DSL, then:

build.gradle.kts:

tasks.withType<JavaCompile> {
    options.encoding = "UTF-8"
}