How can I change JDK 1.8 to JDK 11 in Heroku?

Question

I created pipelines for bitbucket to deploy app to Heroku. I use java 11 but Heroku installs 1.8. enter image description here

How to fix it?

I also created system.properties in main/resources indicating JDK and Maven versions:

enter image description here

I think this [link](https://devcenter.heroku.com/articles/java-support#specifying-a-java-version) can help you — Neto Deolino, Aug 30 '20 at 21:23
I'm sorry. I forgot to mention that I did it. [image](https://snipboard.io/gYabGD.jpg) — Denis Romanenko, Aug 30 '20 at 21:31
@DenisRomanenko, possibly you should add `system.properties` to the root directory of your application and check `JAVA_HOME` env variable as described here: [Could not target platform: 'Java SE 9' using tool chain: 'JDK 8 (1.8)'](https://stackoverflow.com/questions/47500674/gradle-java9-could-not-target-platform-java-se-9-using-tool-chain-jdk-8-1) — Nowhere Man, Aug 30 '20 at 23:23

score 2 · Accepted Answer · answered Aug 30 '20 at 21:25

2

Create a system.properties file in your directory and commit to git. more info https://devcenter.heroku.com/articles/customizing-the-jdk#prerequisites see doc for more info.

answered Aug 30 '20 at 21:25

Abrar Ansari

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I'm sorry. I forgot to mention that I did it. [image](https://snipboard.io/gYabGD.jpg) – Denis Romanenko Aug 30 '20 at 21:34
try with specify java version as `java.runtime.version=11` it will automatically select java 11.0.8. see here `https://devcenter.heroku.com/articles/java-support#supported-java-versions` – Abrar Ansari Aug 30 '20 at 21:36
This is my first question, this is why I forgot to note a lot of things. I also tried it. – Denis Romanenko Aug 30 '20 at 21:51
2

You have to create `system.properties` file in your root directory not in `main/resources`, and don't forget to commit – Abrar Ansari Aug 31 '20 at 08:27
Thanks @AbrarAnsari It helped me also, Regards! Upvoted! – Prashant Balotra Sep 28 '21 at 19:04

score 0 · Answer 2 · answered Mar 10 '21 at 06:02

0

Firstly, check what the system.properties file definitely got into your Git-repository by using git ls-files.

Secondly, check what the first 3 bytes of the file are not UTF-8 BOM.

answered Mar 10 '21 at 06:02

happy_marmoset

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score 0 · Answer 3 · answered Jun 23 '22 at 07:28

README

If you don't want to add a additional file (system.properties) in your code like me, then this answer would help.

Idea: Change java buildpack jdk default version from 1.8 to 11

Step:

Fork official java buildpack: https://github.com/heroku/heroku-buildpack-java. e.g. https://github.com/archongum/heroku-buildpack-java
Find out where the default jdk version variable is.

Commit changes and Push to GitHub
Add your own buildpack in Heroku
Trigger deploy and done

How can I change JDK 1.8 to JDK 11 in Heroku?

3 Answers3

README