How can I override Spring Boot application.properties programmatically?

Question

I have jdbc property files which I take from external configuration web-service In spring boot in order to set mysql props it\'s easy as adding those to application.properti

Answer 1

If you need do to this for testing purposes: since spring-test 5.2.5 you can use @DynamicPropertySource:

    @DynamicPropertySource
    static void setDynamicProperties(DynamicPropertyRegistry registry) {
        registry.add("some.property", () -> some.way().of(supplying).a(value) );
    }

Takes precedence over pretty much all of the other ways of supplying properties. The method must be static though.

Answer 2

This is how you can set properties during startup if you are running spring boot application.

The easiest way is to set the properties before you even started an app.

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication application = new SpringApplication(Application.class);
        ConfigurableEnvironment env = new ConfigurableEnvironment();
        env.setActiveProfiles("whatever");

        Properties properties = new Properties();
        properties.put("server.port", 9999);
        env.getPropertySources()
            .addFirst(new PropertiesPropertySource("initProps", properties));

        application.setEnvironment(env);
        application.run(args);
    }
}

Answer 3

With this Method in your configuration you can set default properties.

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class)
              .properties("propertyKey=propertyValue");
}

Answer 4

Under META-INF folder create exactly this folders and file: spring>batch>override>data-source-context.xml and in your xml file make sure to override the paramters you want like this:

<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${loader.jdbc.driver}" />
    <property name="url" value="${loader.jdbc.url}" />
    <property name="username" value="${loader.jdbc.username}" />
    <property name="password" value="${loader.jdbc.password}" />
</bean>

<bean id="transactionManager"
    class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource" />
</bean>

or use a jndi like this in the xml file to access your external configuration file like catalina.properties

<jee:jndi-lookup id="dataSource"
    jndi-name="java:comp/env/jdbc/loader-batch-dataSource" lookup-on-startup="true"
    resource-ref="true" cache="true" />