mill and JAVA_HOME under ubuntu

[nemoo]

I am having problems on ubuntu with mill finding the java home.
I tried this:

> export JAVA_HOME=/usr/bin/java                          
> mill concat
/home/username/.cache/mill/download/0.10.2: 43: exec: /usr/bin/java/bin/java: not found

mill seems to add "/bin/java" to my JAVA_HOME variable?

If I make the JAVA_HOME path shorter accordingly, mill seems to find java and runs fine:

> export JAVA_HOME=/usr         
> mill concat          
[1/2] srcs 

Does that make any sense?

[lefou]

As JAVA_HOME is just a convention but not a standard, most (if not all) tools that support this variable expect a JDK/JRE directory layout. That's why we add (as you already found out) a bin/java to access the Java executable. If your Java installation is rolled out into a LSB directory layout, using JAVA_HOME=/usr makes sense. But I can't tell you if there are any downsides.