Java version should be consistent for all tasks
"It has been possible to configure Gradle to build a project
with a different Java version than the one used to run Gradle. However,
it has required configuring each task like compilation, test, and javadoc separately.
Gradle 6.7 introduces “Java toolchain support”. In a nutshell,
it allows you to run Gradle with whatever version of Java you have installed,
while Gradle builds the project with the version of Java declared in a single place.
Gradle will automatically configure the build, detect already installed
JDKs and download the required JDK if it is not already installed."
More at https://blog.gradle.org/java-toolchains
Signed-off-by: Patryk Mis <foss@patrykmis.com>
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