Unexpected JDK detection error in macOS

“To use Java command-line tools you need to install a JDK”

Here’s what I do:

➜  ~ bloop server
Defaulting on nailgun port 8212
There is no server running at port 8212
Starting the bloop server... this may take a few seconds
Running /usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server as a jar...
Shelling out with '['java', '-jar', '/usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server']' ...
Error: Invalid or corrupt jarfile /usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server
Running /usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server as a script...
Shelling out in Unix system with ['sh', '/usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server']
Detected java options are ''
Unable to find any JVMs matching version "1.8".
No Java runtime present, requesting install.
Bloop server in /usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server failed to run.
First invocation attempt: ['java', '-jar', '/usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server']
-> Return code: 1
Second invocation attempt: ['sh', '/usr/local/Cellar/bloop/1.4.0-RC1/bin/blp-server']
-> Return code: 2
➜  ~ java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.232-b09, mixed mode)
➜  ~ echo $JAVA_HOME
/Users/jules.ivanic/.sdkman/candidates/java/current

When, I’m launching the bloop server command the following Macos popup shows up:

I installed the JDK with SDKMAN (https://sdkman.io/). My JAVA_HOME is correctly set.

How can I fix that?

Thanks, Jules

[jvican]

Thanks for reporting @guizmaii. This issue happens because /usr/libexec/java_home doesn’t support sdkman. @ahjohannessen has also reported the same issue in Discord.

I plan to fix this by getting rid of java_home in the macOS brew formula so that we don’t force JDK 8 on macOS. This is a thing inherited from the past where bloop didn’t support JDK 11 and where I was wary of supporting JDK 11 over JDK 8 because it produces slower compilation. That will change in the release of v1.4.0.

[zingmane]

Setting $HOME/.bloop/bloop.json hasn’t worked for me (macOS)

But that fixed it:

• brew uninstall bloop (1.4.4)
• set SDK pathexport JAVA_HOME="/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home"
• reinstall brew install bloop
• first call fails again bloop exit
• second call (also starts the server) bloop about
• everything working as expected again 🎉🤷‍♂️

> bloop about
bloop v1.4.4

Using Scala v2.12.8 and Zinc v1.3.0-M4+45-d4354be3
Running on Java JDK v11.0.2 (/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home)
  -> Supports debugging user code, Java Debug Interface (JDI) is available.
Maintained by the Scala Center (Jorge Vicente Cantero, Martin Duhem)