Fast-jar compiled Quarkus app won't start — no logs, no errors

[next-pausegarra]

Hi there!

I'm having trouble running my Quarkus API when it's compiled with the fast-jar package type — it simply doesn't start, and I don't get any logs or errors. However, when I use the uber-jar packaging, everything works fine.

Here's what happens:

➜ git:(master) java -jar target/quarkus-app/quarkus-run.jar
➜ git:(master)

Nothing shows up, the application just exits silently.

Here's the link to the GitHub repository if you'd like to take a look: 👉 https://github.com/pausegarra/russkiy-shpargalka-api

Any idea what could be causing this?

Thanks in advance!

[cescoffier]

That's odd. Could you provide a smaller reproducer? This one is a bit too complex to investigate.

[next-pausegarra]

Yes, what I do is the following:

Compile the app

./mvnw clean package -DskipTests

And then run de jar with the following command:

java -jar target/quarkus-app/quarkus-run.jar

[jayshah1819]

Try running with java -Dquarkus.log.console.level=debug -jar target/quarkus-app/quarkus-run.jar to reveal hidden errors—likely a missing dependency or classpath issue.

[next-pausegarra]

➜  git:(master)  java -Dquarkus.log.console.level=debug -jar target/quarkus-app/quarkus-run.jar
➜  git:(master)

[cescoffier]

It's a SnakeYaml issue:

RuntimeException: 'void org.yaml.snakeyaml.constructor.SafeConstructor.<init>(org.yaml.snakeyaml.LoaderOptions)'
java.lang.NoSuchMethodError: 'void org.yaml.snakeyaml.constructor.SafeConstructor.<init>(org.yaml.snakeyaml.LoaderOptions)'
        at io.smallrye.config.source.yaml.YamlConfigSource$StringConstructor.<init>(YamlConfigSource.java:188)
        at io.smallrye.config.source.yaml.YamlConfigSource.streamToMap(YamlConfigSource.java:70)

Basically, you have something in your dependency tree that conflicts with the SnakeYaml version Quarkus needs.

Looking at your dependency tree, I'm pretty sure it's:

[INFO] \- com.github.javafaker:javafaker:jar:1.0.2:compile
[INFO]    +- org.apache.commons:commons-lang3:jar:3.17.0:compile
[INFO]    +- org.yaml:snakeyaml:jar:android:1.23:compile.      <---- definitely wrong
[INFO]    \- com.github.mifmif:generex:jar:1.0.2:compile
[INFO]       \- dk.brics.automaton:automaton:jar:1.11-8:compile

I would either remove this dependency, or exclude snakeyaml, or change that dependency.

[next-pausegarra]

Thanks mate! thtat solved the issue
Can you tell me how did you manage to get that error log please?

RuntimeException: 'void org.yaml.snakeyaml.constructor.SafeConstructor.<init>(org.yaml.snakeyaml.LoaderOptions)'
java.lang.NoSuchMethodError: 'void org.yaml.snakeyaml.constructor.SafeConstructor.<init>(org.yaml.snakeyaml.LoaderOptions)'
        at io.smallrye.config.source.yaml.YamlConfigSource$StringConstructor.<init>(YamlConfigSource.java:188)
        at io.smallrye.config.source.yaml.YamlConfigSource.streamToMap(YamlConfigSource.java:70)

Thanks!

[cescoffier]

I just started the app with debug options and configured the debugger to catch exceptions.