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How do i set up java 16 on ubuntu 18.04

I am trying to make Minecraft mods with Fabric, but when I run ./gradlew genSources, I get this error:
FAILURE: Build failed with an exception.
* Where:
Build file '/home/andrew/Desktop/Minecraft Mods/TEST/build.gradle' line: 2
* What went wrong:
An exception occurred applying plugin request [id: 'fabric-loom', version: '0.8-SNAPSHOT']
> Failed to apply plugin 'fabric-loom'.
> You are using an outdated version of Java (11). Java 16 or higher is required.
* 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 701ms
I uninstalled java 11 and installed java 16 with the deb file from https://www.oracle.com/java/technologies/javase-jdk16-downloads.html. Once I do that, I get this error when running ./gradlew genSources:
ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.
How do I fix this? Here is the tutorial I am following: https://www.youtube.com/watch?v=_JZ7bnk3oiM

Could not determine java version from '15.0.1'

I try to upload my test package firebase App Distribution by using
./gradlew assembleAlphaDebug appDistributionUploadAlphaDebug code snippet through android studio terminal, 5 days before I updated my java version and then I have started getting this error. I have not come across any solution until now.
FAILURE: Build failed with an exception.
What went wrong:
Could not determine java version from '15.0.1'.
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.

If you are using Mac, follow these steps:
vi ~/.bash_profile
Add in JAVA_HOME path there
export JAVA_HOME=/opt/bdc/opt/jdk
Save :wq
Execute source ~/.bash-profile
Once done do echo $JAVA_Home
and try your next steps.

Issue with ./gradlew clean using react native android

Within my app, I run cd android and then ./gradlew clean.
I then get a BUILD FAILURE error:
FAILURE: Build failed with an exception.
* What went wrong:
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

FIXED.
I swapped the value of the distributionUrl within the gradle-wrapper.properties file with this value https\://services.gradle.org/distributions/gradle-6.3-all.zip
zipStoreBase=GRADLE_USER_HOME

Stacktrace option for Gradle task in Eclipse

A Gradle task classesPipeline is being run in Eclipse. This task assembles .class files by depending on the standard classes task, then attempts executing a batchfile.
All goes fine until the batchfile, where the script dies a horrible death in Eclipse, by printing to console:
Execution failed for task ':classesPipeline'.
> A problem occurred starting process 'command '../SomeFolder/SomeBatchfile.bat''
* 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.
The log suggests to run the task with --stacktrace, but how do I do this?
So I checked the project settings, the Gradle section offers no command line arguments, as far as i see. It is noteworthy, that running the task with --stacktrace via gradlew is of no value to me, because the task executes just fine in this case, this is only happening in Eclipse specifically.
TL;DR:
How can a gradle task be executed from Eclipse, while passing arguments to it?

To anyone who may come into contact with this problem:
I found the solution in a different, but closely related question:
How can I make "gradle --stacktrace" the default?
It is sufficient to add the following to the build.gradle:
gradle.startParameter.showStacktrace = org.gradle.api.logging.configuration.ShowStacktrace.ALWAYS

Cordova Emulating/Building Android always returning Gradle Error

I am currently trying to run an emulator on Android on my Mac PC through Cordova. But it seems like I always get issue and it always comes down to Java Environment possibly not being correct. When I try to do either a build or a emulate, I get the following error:
Error: /cordova_app_directory/platforms/android/gradlew: Command failed with exit code 1 Error
output:
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine java version from '9.0.1'.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
* Get more help at https://help.gradle.org
I have gone through multiple ways of trying to fix this. This includes updating java development enviroment (which its 10.0.1) and also update Gradle (which is 4.4). I also tried removing and re-adding the platform back in but it doesn't work.
Does anyone have any idea of what could be causing this issue?