Cannot specify JAVA_VERSION when deploying a jar archive

[yohann-bacha]

In the documentation page for deploying a jar archive, it is advised to specify the JAVA_VERSION of the runtime.

Though, a user did specified it for deploying its jar on the version 11, and it's not taken in account.

Reading in the related buildpack, this is the value java.runtime.version in the system.properties file that is read in order to define the used Java version.

We need to know how to handle this problem.

• should we tell in the docs to use a system.properties file?
• should we fix our buildpack?