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readme.md

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Example of Complete Code

/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.0-M5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.in28minutes.springboot.tutorial.basics.application.configuration</groupId>
    <artifactId>spring-boot-kotlin-basics-configuration</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-kotlin-basics-configuration</name>
    <description>Spring Boot Tutorial - Application Configuration with Profiles and YAML</description>

    <properties>
        <java.version>17</java.version>
        <kotlin.version>1.7.10</kotlin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-reflect</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-jdk8</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <configuration>
                    <args>
                        <arg>-Xjsr305=strict</arg>
                    </args>
                    <compilerPlugins>
                        <plugin>spring</plugin>
                    </compilerPlugins>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.jetbrains.kotlin</groupId>
                        <artifactId>kotlin-maven-allopen</artifactId>
                        <version>${kotlin.version}</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

/src/main/java/com/in28minutes/springboot/tutorial/basics/application/configuration/BasicConfiguration.kt

package com.in28minutes.springboot.tutorial.basics.application.configuration

import org.springframework.boot.context.properties.ConfigurationProperties
import org.springframework.stereotype.Component

@Component
@ConfigurationProperties("basic")
class BasicConfiguration {
    var isValue = false
    var message: String? = null
    var number = 0
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/application/configuration/SpringBootTutorialBasicsConfigurationApplication.kt

package com.in28minutes.springboot.tutorial.basics.application.configuration

import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.context.ApplicationContext
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Profile

@SpringBootApplication
open class SpringBootTutorialBasicsConfigurationApplication {
    @Profile("dev")
    @Bean
    open fun devBean(): String {
        return "dev"
    }

    @Profile("qa")
    @Bean
    open fun qaBean(): String {
        return "qa"
    }

    @Profile("prod")
    @Bean
    open fun prodBean(): String {
        return "prod"
    }

    companion object {
        @JvmStatic
        fun main(args: Array<String>) {
            val applicationContext: ApplicationContext = SpringApplication.run(SpringBootTutorialBasicsConfigurationApplication::class.kt, *args)
            for (name in applicationContext.beanDefinitionNames) {
                println(name)
            }
        }
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/application/configuration/WelcomeResource.kt

package com.in28minutes.springboot.tutorial.basics.application.configuration

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.beans.factory.annotation.Value
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RestController

@RestController
class WelcomeResource {
    @Value("${welcome.message}")
    private val welcomeMessage: String? = null

    @Autowired
    private val configuration: BasicConfiguration? = null

    @GetMapping("/welcome")
    fun retrieveWelcomeMessage(): String? {
        // Complex Method
        return welcomeMessage
    }

    @RequestMapping("/dynamic-configuration")
    fun dynamicConfiguration(): Map<String, Any?> {
        // Not the best practice to use a map to store different types!
        val configMap: MutableMap<String, Any?> = HashMap()
        configMap["message"] = configuration!!.message
        configMap["number"] = configuration.number
        configMap["key"] = configuration.isValue
        return configMap
    }
}

/src/main/resources/application-dev.properties

welcome.message=Welcome message from property file! Welcome to ${app.name} in DEV Using Kotlin
basic.message=Dynamic Message in DEV

/src/main/resources/application-prod.properties

logging.level.org.springframework=INFO

/src/main/resources/application.properties

spring.profiles.active=dev
logging.level.org.springframework.web.servlet=DEBUG
app.name=in28Minutes
welcome.message=Welcome message from property file! Welcome to ${app.name}
basic.value=true
basic.message=Dynamic Message
basic.number=100

/src/main/resources/application.yaml

logging:
  level:
    org.springframework: INFO
    org.springframework.web.servlet: DEBUG

basic:
  value: true
  message: Dynamic Message YAML
  number: 100

/src/test/java/com/in28minutes/springboot/tutorial/basics/application/configuration/SpringBootTutorialBasicsConfigurationApplicationTests.kt

package com.in28minutes.springboot.tutorial.basics.application.configuration

import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.test.context.junit.jupiter.SpringExtension

@ExtendWith(SpringExtension::class)
@SpringBootTest(classes = [SpringBootTutorialBasicsConfigurationApplication::class])
class SpringBootTutorialBasicsConfigurationApplicationTests {
    @Test
    fun contextLoads() {
    }
}