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10: Spring, JavaConfig (i.e @Configuration), JPA & Hibernate by example

Example #1 Wiring JDBC Datasource


@Configuration
@ImportResource("application.yml")
public class AppConfig
{
    @Autowired
    private Environment environment;

    @Bean
    public DriverManagerDataSource datasource() {
        DriverManagerDataSource ds = new DriverManagerDataSource();
        ds.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name"));
        ds.setUrl(environment.getRequiredProperty("spring.datasource.url"));
        ds.setUsername(environment.getRequiredProperty("spring.datasource.username"));
        ds.setPassword(environment.getRequiredProperty("spring.datasource.password"));
        return ds;
    }
}

@Configuration

@ImportResource("application.yml"

…

Spring loading property files & properties

conf/db.properties

# jdbc.X
jdbc.driverClassName=org.hsqldb.jdbcDriver
jdbc.url=jdbc:hsqldb:hsql://localhost/mytestdb
jdbc.user=SA
jdbc.pass=
# hibernate.X
hibernate.dialect=org.hibernate.dialect.HSQLDialect
hibernate.show_sql=false
hibernate.hbm2ddl.auto=

#1. Register a Properties File in Application Context XML

The “<property-placeholder>” tag.

<context:property-placeholder location="classpath:conf/db.properties" />

1	<context:property-placeholder location="classpath:conf/db.properties" />

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="locations">
    <list>
      <value>classpath:conf/db.properties</value>
    </list>
  </property>
  <property name="ignoreUnresolvablePlaceholders" value="true"/>
</bean>

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"

…

Spring, JavaConfig (@Configuration), and TransactionManager

This extedns configuring JDBC and JPA to configure the TransactionManager.

Example #1 Wiring JDBC Transaction Manager

Note: @EnableTransactionManagement annotation


@Configuration
@ImportResource("application.yml")
@EnableTransactionManagement
public class AppConfig
  
    @Bean
    public DriverManagerDataSource datasource() {
        DriverManagerDataSource ds = new DriverManagerDataSource();
        ds.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name"));
        ds.setUrl(environment.getRequiredProperty("spring.datasource.url"));
        ds.setUsername(environment.getRequiredProperty("spring.datasource.username"));
        ds.setPassword(environment.getRequiredProperty("spring.datasource.password"));
        return ds;
    }
    
    @Bean
    public JdbcTemplate jdbcTemplate() {
        return new JdbcTemplate(datasource());
    }
    
    @Bean
    public DataSourceTransactionManager transactionManager() {
        final DataSourceTransactionManager transactionManager = new DataSourceTransactionManager(datasource());
        return transactionManager;
    }
}

@Configuration

@ImportResource("application.yml"

…

Spring, JavaConfig (i.e @Configuration) & JDBC by example

Example #1 Wiring JDBC Datasource


@Configuration
@ImportResource("application.yml")
public class AppConfig
{
    @Autowired
    private Environment environment;

    @Bean
    public DriverManagerDataSource datasource() {
        DriverManagerDataSource ds = new DriverManagerDataSource();
        ds.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name"));
        ds.setUrl(environment.getRequiredProperty("spring.datasource.url"));
        ds.setUsername(environment.getRequiredProperty("spring.datasource.username"));
        ds.setPassword(environment.getRequiredProperty("spring.datasource.password"));
        return ds;
    }
}

@Configuration

@ImportResource("application.yml"

…

Spring, JavaConfig (i.e @Configuration) & JMS by example

Step 1: Define the messaging system connectivity, destination (e.g. topic or queue) and message selector properties via a YAML or .properties file. Here is an example of application.yml file.


#############################
# MQ Settings               #
#############################
spring:
  mq:
    hostname: my-mq-host
    channel: mychannel
    port: 2500
    queue.manager: GHTFDS
    environment: EN7

  # MQ SSL settings -- uncomment the below section to enable SSL for MQ
    # ssl:
      # enabled:
      # cipher.suite:

…

Blog Archives

10: Spring, JavaConfig (i.e @Configuration), JPA & Hibernate by example

Spring loading property files & properties

Spring, JavaConfig (@Configuration), and TransactionManager

Spring, JavaConfig (i.e @Configuration) & JDBC by example

Spring, JavaConfig (i.e @Configuration) & JMS by example

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