Spring Boots

• Try out Java Spring Boot in VSCode
• Minimal examples for starter code

Setup VSCode Extensions

• when open some java file, VSCode will suggest Java extensions
  • Java Extension Pack by Microsoft is good to install
  • I did not install Spring Boot Extension Pack by Pivotal
    • (since some extension in the pack conflicted to Maven Projects extension)
• the below is the list of extensions I use for Java and SQL
• install command: code --install-extension <extension-id>

$ code --list-extensions
GabrielBB.vscode-lombok
juhahinkula.thymeleaf
ms-azuretools.vscode-docker
ms-mssql.mssql
mtxr.sqltools
Pivotal.vscode-spring-boot
redhat.java
redhat.vscode-xml
streetsidesoftware.code-spell-checker
VisualStudioExptTeam.vscodeintellicode
vscjava.vscode-java-debug
vscjava.vscode-java-dependency
vscjava.vscode-java-pack
vscjava.vscode-java-test
vscjava.vscode-maven
vscjava.vscode-spring-boot-dashboard
vscjava.vscode-spring-initializr

• to create spring boot project quickly
  • open Command Palette by Ctrl(or ⌘)+Shift+P
  • type spring initializr
• to run the spring boot project, go to the left bottom then
  • open Spring-Boot Dashboard and right click and Run or...
  • open Maven Projects, find spring-boot:run and click it

Spring Data JDBC sample apps

• Spring Data JDBC is very simple and straightforward db access library.
• It is something middle between Spring Data JPA and JDBC Template.
• Since this is relatively new stuff, I made two samples apps.
  • spring-data-jdbc-rest
  • spring-data-jdbc-web-security

CLI demos

• demo-cli (before)
  • @Configuration AppConfig class register @Bean
  • getBean from ApplicationContext
• demo-cli2 (middle)
  • @Configuration AppConfig class register @Bean
  • @Autowired bean (NO getBean)
• demo-cli3 (after)
  • @ComponentScan auto register @Component bean (NO @Import @Configuration)
  • @Autowired bean (NO getBean)

DB demos

• demo-crm
  • using standard layer structure
• demo-jdbc
  • using NamedParameterJdbcTemplate
• demo-jpa
  • using JpaRepository

Web demos

• demo-web-rest
  • rest api + unit test (Service) and integration test (TestRestTemplate)
• spring-data-jpa-thymeleaf
  • thymeleaf web pages + flyway + unit test

VSCode Trouble Shooting

• "The import of xxx cannot be resolved" or "build failed, do you want to continue?"
  • Clean cache from Command Palette
    • Command + Shift + p -> "java clean"
    • Select "java: Clean the Java language server workspace"
  • or Clean cache manually
    • rm all files in $HOME/Library/Application\ Support/Code/User/workspaceStorage/
• "Class path is incomplete" warning
  • okay to just close the window
• org.h2.jdbc.JdbcSQLException: Column not found
  • https://stackoverflow.com/questions/35646432

Reference

• Spring Boot in Visual Studio Code
  • https://code.visualstudio.com/docs/java/java-spring-boot
• Visual Studio Code - Java - Import Errors and More
  • https://stackoverflow.com/questions/45743779
• 書籍「はじめてのSpring Boot」のサポートページ
  • https://github.com/making/hajiboot-samples
• @RequestMapping handler Method Arguments
  • https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-ann-methods
• How can I fix build failed, do you want to continue? in vscode
  • https://stackoverflow.com/questions/50454523