问题
After moving to Catalina and re-installing everything, no way to run my Play Scala app.
After doing sbt then run, I get this error:
[warn] Error loading JNotify watch service: null
Everything was installed with brew from this brewfile (I didn't paste the complete file):
tap "AdoptOpenJDK/openjdk"
# Mac apps
cask "adoptopenjdk8"
brew "sbt@0.13"
brew "jenv"
Java version:
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_242-b08)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.242-b08, mixed mode)
sbt: 0.13.18 play: 2.6.20 os x: 10.15.3 (19D76)
回答1:
I can't technically explain why JNotify is not working well on your environment but I can definitely say it's linked to the latest update of openjdk8.
So I succeeded to reproduce the issue with adoptopenjdk8 version 242, my workaround is to uninstall this version of openjdk and force brew to install a previous version (232) :
brew cask install "https://raw.githubusercontent.com/AdoptOpenJDK/homebrew-openjdk/19d716f1c9ebc325ed23c5df580e0d2b027285a1/Casks/adoptopenjdk8.rb"
回答2:
I faced this issue. The above answer helped me. A slightly easier approach for me was instead of uninstalling the current version, I installed 8.0.232.fx-zulu using sdk man. Made this version default. It worked.
commands:
sdk list java sdk install java 8.0.232.fx-zulu make it default: y
Build and run your app.
回答3:
Thanks to @rsefuril. I had the same issue. I had adoptopenjdk8 version 242, installing openjdk version "1.8.0_232" fixed the issue. But I installed graalvm. This link shows how to install graalvm to macos. Download graalvm from here https://github.com/graalvm/graalvm-ce-builds/releases/tag/vm-19.3.0
I downloaded https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-19.3.0/graalvm-ce-java8-darwin-amd64-19.3.0.tar.gz
Then extract the file and move the extracted folder
sudo mv ~/Downloads/graalvm-ce-java8-19.3.0 /Library/Java/JavaVirtualMachines
Add following line to ~/.zprofile file: export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
Then check if java version is correct:
java -version
openjdk version "1.8.0_232" OpenJDK Runtime Environment (build 1.8.0_232-20191009173705.graal.jdk8u-src-tar-gz-b07) OpenJDK 64-Bit GraalVM CE 19.3.0 (build 25.232-b07-jvmci-19.3-b05, mixed mode)
That's it.
PS: You may need to delete previous Java 1.8 from system. I deleted it by removing folders from /Library/Java/JavaVirtualMachines/
来源：https://stackoverflow.com/questions/60415568/error-when-trying-to-run-a-play-scala-app-with-sbt-after-fresh-install-on-catali