How do you manage environment-specific configurations in a Gradle project?

Managing environment-specific configuration in Gradle means parameterizing the build so the same build.gradle produces different behavior (dependencies, resource files, or settings) depending on which environment — dev, test, prod — is being targeted. This is typically driven by project properties passed at build time rather than hardcoded values.

Key Points: • Pass an environment flag via the command line with -P, e.g. gradle build -Penv=prod, and read it in build.gradle with project.findProperty('env'). • Use conditional logic in build.gradle to apply different dependencies, resource directories, or task behavior based on that property. • Separate environment-specific properties files (application-dev.properties, application-prod.properties) are a common complement, especially in Spring Boot projects. • Avoid hardcoding secrets for any environment directly in build.gradle; use environment variables or a secrets manager instead. • Gradle's source sets can also be used to include environment-specific source or resource directories conditionally.

Example: A build.gradle might read project.findProperty('env') to decide which properties file to copy into the final resources directory, so running gradle build -Penv=prod packages production configuration while the default build uses dev settings.

Code Example:

def targetEnv = project.findProperty('env') ?: 'dev'

tasks.register('copyEnvConfig', Copy) {
    from "src/main/resources/env/${targetEnv}"
    into "$buildDir/resources/main"
}

Interview Tip: A concise interview answer is:

"I drive environment differences through a project property passed at build time, like -Penv=prod, and use that in build.gradle to select the right configuration files or dependencies conditionally. I keep actual secrets out of the build script entirely, pulling them from environment variables or a secrets manager instead."