How do I configure Spring to partially and optionally override properties?

Question

I would like to have a properties setup which can, on certain environments, override specific properties. For example, our default JDBC properties for dev are:

• db

Answer 1

I had a similar issue with overwriting already existing properties in integration tests

I came up with this solution:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = {
    SomeProdConfig.class,
    MyWebTest.TestConfig.class
})
@WebIntegrationTest
public class MyWebTest {


    @Configuration
    public static class TestConfig {

        @Inject
        private Environment env;


        @PostConstruct
        public void overwriteProperties() throws Exception {
            final Map systemProperties = ((ConfigurableEnvironment) env)
                .getSystemProperties();
            systemProperties.put("some.prop", "test.value");
        }
    }