Configure Datasource

Instead of configuring DataSource in Java code.

Spring Boot provides built-in application.properties(or application.yml for YAML format) to configure DataSource in project specific file.

Create a application.yml in src/main/resources folder. It will override the default configuration.

server:
    port: 9000
    contextPath: 

spring: 
    profiles:
        active: dev
    devtools.restart.exclude: static/**,public/**
    datasource:
        dataSourceClassName: org.h2.jdbcx.JdbcDataSource
        url: jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1
        databaseName: 
        serverName: 
        username: sa
        password: 

    jpa:
        database-platform: org.hibernate.dialect.H2Dialect
        database: H2
        openInView: false
        show_sql: true
        generate-ddl: true
        hibernate:
            ddl-auto: 
            naming-strategy: org.hibernate.cfg.EJB3NamingStrategy
        properties:
            hibernate.cache.use_second_level_cache: true
            hibernate.cache.use_query_cache: false
            hibernate.generate_statistics: true
            hibernate.cache.region.factory_class: org.hibernate.cache.internal.NoCachingRegionFactory

    data:
        jpa.repositories.enabled: true 

    freemarker:
        check-template-location: false

    messages:
        basename: messages

logging:
    file: app.log
    level:
        root: INFO
        org.springframework.web: INFO
        com.hantsylabs.restexample.springmvc: DEBUG

This is a classic application configuration file in YAML format.

It is easy to understand.

server.port specifies the port number this application will serve at start up.

Under spring defines DataSource, JPA, Spring Data JPA etc.

logging configures logging level for packages.

NOTE: Spring Boot also supports properties, groovy DSL format for application configuration.