Existing gradlew breaks with Java version 14

[akshit-sharma]

While building the vulkan on android, the gradlew contains the version 5.1.1.

Steps to reproduce:

$ # Don't have any gradle installed on system
$ # Install JDK 14
$ git clone --recursive https://github.com/LunarG/VulkanSamples.git
$ cd VulkanSamples/API-Samples
$ cmake -DANDROID=ON -DABI_NAME=x86_64
$ cd android
$ python3 compile_shaders.py
$ export ANDROID_SDK_ROOT=/path/to/sdk-directory
$ export ANDROID_NDK_HOME=/path/to/ndk-directory
$ ./gradlew build

While trying to compile ./gradlew build, it gives following error.

FAILURE: Build failed with an exception.

* What went wrong:
Could not create an instance of type org.gradle.initialization.DefaultSettings_Decorated.
> Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s

According to issue #12599 on gradle, this can be resolved by updating the gradle to 6.3 or higher.

Here is the output from ./gradlew --version:

akshit@StealthUbuntu:~/Projects/VulkanSamples/API-Samples/android$ ./gradlew --version

------------------------------------------------------------
Gradle 5.1.1
------------------------------------------------------------

Build time:   2019-01-10 23:05:02 UTC
Revision:     3c9abb645fb83932c44e8610642393ad62116807

Kotlin DSL:   1.1.1
Kotlin:       1.3.11
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          14.0.1 (Oracle Corporation 14.0.1+7)
OS:           Linux 5.4.0-37-generic amd64

I am unable to figure out, How to make gradlew have version > 6.5 ?
Does the VulkanSamples have to update something?

Thanks

[TonyBarbour]

@ggfan could you take a look?

[ggfan]

you could change gradle version in this file: https://github.com/LunarG/VulkanSamples/blob/master/API-Samples/android/gradle/wrapper/gradle-wrapper.properties

Android studio is still using java8 though: it has its own open JDK version inside its package.