spring-boot-demo

A simple project to learn Spring Boot

Starting the Application

From the command line run: ./gradlew bootRun

Properties

In the application.yml file, I have the following properties for demonstration purposes:

my:
  prop:
    one: ${propOne:defaultProp1}
    two: ${propTwo:defaultProp2}
    three:

There are many ways to pass in values to the application. Here are a few:

• Environment variables (you can specify either hierarchy or short name):
  export propOne=p1
export MY_PROP_TWO=p2 (note underscores used instead of periods)
  java -jar build/libs/spring-boot-demo-0.0.1-SNAPSHOT.jar
  or ./gradlew bootRun

• Pass properties as command line arguments using Gradle:
  ./gradlew -DpropOne=p1 -Dmy.prop.two=p2 bootRun
  But make sure this is in the build.gradle file:

bootRun {
    systemProperties System.properties
}

• Pass properties as command line arguments using java:
  java -DpropOne=p1 -Dmy.prop.two=p2 -jar build/libs/spring-boot-demo-0.0.1-SNAPSHOT.jar
  or this
  java -jar build/libs/spring-boot-demo-0.0.1-SNAPSHOT.jar --propOne=p1 --my.prop.two=p2

Profile Based Properties

At the top of application.yml are the default properties, and further down are two profiles: test and prod. To use the properties defined in a profile, you can run the app in these ways

• ./gradlew -Dspring.profiles.active=prod bootRun
• java -Dspring.profiles.active=prod -jar build/libs/spring-boot-demo-0.0.1-SNAPSHOT.jar
• java -jar build/libs/spring-boot-demo-0.0.1-SNAPSHOT.jar --spring.profiles.active=prod