# 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.

```yaml
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.


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