"NoClassDefFoundError" error with Cucumber in Katalon Runtime Engine

Last updated: July 2026

When running Cucumber tests in Katalon Runtime Engine, you may encounter:

java.lang.NoClassDefFoundError: com/nimbusds/oauth2/sdk/ParseException

Cause

This error occurs when using CucumberGlueGenerator.addDefaultPackages() in Test Listeners, which causes class loading conflicts in Katalon Runtime Engine.

Remedy

Remove CucumberGlueGenerator.addDefaultPackages() from Test Listeners. Step definition packages must now be explicitly specified in @CucumberOptions.:

@CucumberOptions(
    features = "Include/features",
    glue = "your.stepdefinitions.package"
)

When running tests in Katalon Runtime Engine, class isolation requires explicit package specifications. Automatic package discovery can lead to NoClassDefFoundError exceptions.