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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)

Vadim Kotov
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sar
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3 Answers3

3

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"

ersefuril
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  • It seems to be this bug (a result of them breaking a workaround whilst fixing another bug): https://bugs.openjdk.java.net/browse/JDK-8240521 – sihil Apr 13 '20 at 15:50
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.

Dilip Murupala
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0

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

  1. 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

  2. Then extract the file and move the extracted folder

    sudo mv ~/Downloads/graalvm-ce-java8-19.3.0 /Library/Java/JavaVirtualMachines

  3. Add following line to ~/.zprofile file: export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)

  4. 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/

Ikrom
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