What's the difference between 'adopt' and 'adopt-openj9' in jabba

Question

I set up jabba. When I run

jabba ls-remote

I see this list

1.13.0
1.13.0-2
1.6.65
adopt@1.14.0-1
adopt@1.14.0-0
adopt@1.13.0-2
adopt@1.13.0-1
adopt@1.13.0-0
adopt@1.12.0-2
adopt@1.12.0-1
adopt@1.12.0-0
adopt@1.11.0-7
adopt@1.11.0-6
adopt@1.11.0-5
adopt@1.11.0-4
adopt@1.11.0-3
adopt@1.11.0-2
adopt@1.11.0-1
adopt@1.11.0-0
adopt@1.10.0-2
adopt@1.9.0-0
adopt@1.8.0-252
adopt@1.8.0-242
adopt@1.8.0-232
adopt@1.8.0-222
adopt@1.8.0-212
adopt@1.8.0-202
adopt@1.8.0-192
adopt@1.8.0-181
adopt@1.8.0-172
adopt-openj9@1.14.0-1
adopt-openj9@1.14.0-0
adopt-openj9@1.13.0-2
adopt-openj9@1.13.0-1
adopt-openj9@1.13.0-0
adopt-openj9@1.12.0-2
adopt-openj9@1.12.0-1
adopt-openj9@1.12.0-0
adopt-openj9@1.11.0-7
adopt-openj9@1.11.0-6
adopt-openj9@1.11.0-5
adopt-openj9@1.11.0-4
adopt-openj9@1.11.0-3
adopt-openj9@1.11.0-2
adopt-openj9@1.11.0-1
adopt-openj9@1.8.0-252
adopt-openj9@1.8.0-242
adopt-openj9@1.8.0-232
adopt-openj9@1.8.0-222
adopt-openj9@1.8.0-212
adopt-openj9@1.8.0-202
...

What's the difference between adopt@... and adopt-openj9@?

There are also three to the top without any letters, what are they?

Answer 1

When you follow your provided link and scroll down on that page you'll see:

# list available JDK's
jabba ls-remote
# you can use any valid semver range to narrow down the list
jabba ls-remote zulu@~1.8.60
jabba ls-remote "*@>=1.6.45 <1.9" --latest=minor

# install Oracle JDK
jabba install 1.8
# install Oracle Server JRE
jabba install sjre@1.8  
# install Adopt OpenJDK (Hotspot)
jabba install adopt@1.8-0
# install Adopt OpenJDK (Eclipse OpenJ9)
jabba install adopt-openj9@1.9-0
...

So the difference is whether you want to use the Hotspot (Sun, Oracle) or the OpenJ9 (IBM, Eclipse) Java Virtual Machine (JVM).