oliverzott / spring-react-fullstack-microservice

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Run / check application

• http://localhost:8000
• http://localhost:8000/service/instances
• http://localhost:8000/service/all

JAR - Prerequisite:

• Create Gradle Wrapper for application: gradle wrapper https://docs.gradle.org/current/userguide/gradle_wrapper.html

JAR - Create and Run

• Create JAR

  • Local installations:
    • gradle clean build or if maven:
    • mvn clean install
  • With wrapper (no local installation needed)
    • ./gradlew clean build

• Run

  • java –jar <JARFILE> (inside /build/libs )

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Liquibase

Creates database and table-changes automatically when application is run, by using changelog files.

Repository

https://www.baeldung.com/spring-data-jpa-query

• extends JpaRepository<User, Long>
• @Query("select u.name from User u where u.id in (:pIdList)") ...use JPQL in repository

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HTTP REST Controller

• @RequestBody
• @RequestParam
• ResponseEntity<?> wrapper containing/controlling return entity and response method

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Security

• Frontend sends data with authentication encrypted heading
  • btoa https://developer.mozilla.org/en-US/docs/Glossary/Base64
  • Checking in backend by UserDetailService
• Backend password encryption
  • implemented by Spring Boot Security
  • Authorize requests for different websites (ant.Matchers(...))
  • Authentication implemented with ProviderManager
• Authentication ... who are you (username, password)
  • HTTP Filters (used by spring security)
  • Authentication (is) Object, containing of
    • Principal
    • Credentials
    • Authorities

Spring Security

• Default configurations about
  • userclass
  • userservice
  • login path
  • ...
• UserDetailService
  • public class UserDetailServiceImpl implements UserDetailsService

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Eureka

Microservices can communicate which each other via Eureka by using application-names.