JavaEE workshop #9

Viktor Martiš

(spring-boot)

Previous workshop

• IDEA shortcut: multicursor - Alt + J
• Observer pattern
• Web services
• SOAP, WSDL
• Spring-ws, soup-ui

Contents

• IDEA shortcut (git commands): Ctrl + K, Ctrl + Shift +K,Alt + 9 
• Design pattern: Chain of responsibility
• spring-boot
• lombok
• spring-data-jpa

IDEA shortcut

• IDEA shortcut:
  • Commit: Ctrl + K
  • Push:  Ctrl + Shift +K
  • Version control panel: Alt + 9

Chain of responsibility

• comes under behavioral patterns
• chain of receiver objects having the responsibility, depending on run-time conditions, to either handle a request or forward it to the next receiver on the chain
• Real implementation: servlet filters

Spring boot

• easy to create stand-alone, production-grade Spring based Applications
• Run: java -jar XXX.jar
• non-functional features:
  • embedded servers
  • security
  • metrics
  • health checks
  • externalized configuration
• no code generation and non XML configuration

Spring boot

• Stable version: 1.5.9, 2.0 RC
• Servlet containers Tomcat [7,8], Jetty [9.2, 9.3]
• Support Maven or Gradle
• Java/Kotlin/Groovy

Spring-boot CLI

• quick prototyping
• run
• init or start.spring.io

Starters

• set of convenient dependency descriptors that you can include in your application
• contain a lot of the dependencies

Configuration

• Application class - place in root package
• @EnableAutoConfiguration
  • can exclude config parts
• @ComponentScan - default root package
• @SpringBootApplication
  • @Configuration
  • @EnableAutoConfiguration
  • @ComponentScan

Running aps

• Maven: mvn spring-boot:run
• Gradle: ./gradlew bootRun
• Intellij IDEA -> Spring boot plugin
  • development tools

Externalized configuration

• roperties files/YAML files/ environment variables/ command-line arguments
• profile specific configuration
• profiles

Logging

• By default Logback (other options JUL, LOG4J).
• configuration in "application.properties"
• console
• file

Production ready

• spring-boot-starter-actuator
• endpoints

Lombok

• Generation of getters, setters, constructos, toString, hashCode, ...
• IntelliJ plugin
• Other IDE plugins

Spring data JPA

• central interface is Repository/CrudRepository/JpaRepository
• query methods
• @Query
• Custom implementation

Q&A