Hi guys, how can I switch my different configurations when running a Ktor application? I want to know both of in IntelliJ and command line.

Ktor I'm not sure about. Generally when I hear "how can I [do something] with gradle and..."7/10 times it isn't easily possible. That being said, here is what I got that might help; its a kotlin multiplatform project where the JVM uses ktor and compilations are central:

kotlin {
    //Configure all Targets
    jvm("backend") {
        compilations {
            val main by getting
            create(environment) {
                tasks {
                    val backendJar by getting {
                        dependsOn("frontendBrowserWebpack")
                    }
                    register<JavaExec>("run") {
                        setMain("com.company.BackendAppKt")
                        //setClasspath(main.compileDependencyFiles + main.output.classesDirs + output.allOutputs + backendJar.outputs.files)
                        classpath = files("build/libs/FL-backend-1.0-SNAPSHOT.jar")
                        classpath = files("build/libs/FL-frontend-1.0-SNAPSHOT.jar")
                        classpath += main.compileDependencyFiles
                        classpath += backendJar.outputs.files
                        classpath += main.output.classesDirs
                        classpath += output.allOutputs
                        group = "application"
                    }
                }
            }
        }
    }

    // Configure all compilations of all targets:
    targets.all {
        compilations.all {
            kotlinOptions {
                allWarningsAsErrors = true
            }
        }
    }
}

You might need compilation.getBy[Name Or Path] for that...

@Hank, do you mean running different configurations both from intellij and commandline or switching them once running? If first, did you have a look at HOCON configuration in documentation? If second, I guess whatever it is not related with server config such as port/ip and so on, you can always encapsulate in code.

Sorry, I was not clearly. I have some variables that might be different depends on environments, like development, deployment etc. I want to know to how use application.conf to do that and how to switch the versions when I start the application (IntelliJ and command line). I’ve checked the HOCON configuration in documentation on Ktor official website but I still don’t know how to do. It will be great if there is an example code. Thank you for responding.

Here you can find an example: https://github.com/mathias21/KtorEasy

Thank you for your example. I have a question.

ktor {
    deployment {
            dev {
                host = "localhost"
                port = 3500
                databaseHost = "db"
                databasePort = "3306"
            }
            uat {
                host = "<http://myhost.com|myhost.com>"
                port = 3501
                databaseHost = "db"
                databasePort = "3306"
            }
            prod {
                host = "<http://myhost.com|myhost.com>"
                port = 3502
                databaseHost = "databasehost"
                databasePort = "3309"
            }
        }

        application {
            modules = [ com.batcuevasoft ]
        }
}

How can I switch dev, uat or prod block with command line? Using gradle will be great.

So, using gradle it is pretty simple. Create a launch configuration in IntelliJ like the following image:

Wow, that’s awesome. I’ll try it late. Thanks a lot.

Welcome! good luck