/learnJava

spring boot first

Primary LanguageKotlinMIT LicenseMIT

learnJava

spring boot first

samples

first sprint boot example

look into hello2.groovy then terminal spring run hello2.groovy then browser 127.0.0.1:8080

second spring boot example

  1. need to open project kotlin-learning

    1. open KotinLearningApplication.kt
    2. mouse right click on fun main and run it
    3. browser open 127.0.0.1:8080/rest/users/all, empty initially
    4. then 127.0.0.1:8080/rest/users/insert/peter, show 1 user json
    5. then 127.0.0.1:8080/rest/users/insert/sam, show 2 users json

  2. refer to video tutorial Spring Boot (Spring MVC and JPA) App using Kotlin in Java 8 runtime | Tech Primers

  3. learn how to use project generator from [spring io start] (https://start.spring.io/)

first maven example

  1. execute
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
  1. then my-app folder generated, move into the folder, then build it
mvn package
  1. build error encountered like
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project my-app: Compilation failure: Compilation failure:
[ERROR] Source option 5 is no longer supported. Use 7 or later.
[ERROR] Target option 5 is no longer supported. Use 7 or later.
  1. update pom.xml, refer to Error “Source option 5 is no longer supported. Use 6 or later” on Maven compile
<properties>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
</properties>
  1. build ok, run
java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App

log

2021/2/23

  1. first maven example

2021/1/20

initial successful test for spring boot, 1st and 2nd examples