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${...} placeholders in @Value annotation are used to access properties registered with @PropertySource . This is extremely useful with @Configuration beans in Spring applications, but not only. To be sure that this is possible, PropertySourcesPlaceholderConfigurer must be present in all application contexts that placeholders resolution is required. In this blog post you will learn how to configure placeholders resolution in Spring 4 applications and how to inject different types of objects using @Value annotation, including JSR-310 Date-Time, JSR-354 Money & Currency or java.util.Optional .

One of the rules of writing good unit test is that it should fail for one reason, so unit test should test one logical concept. Sometime it is quite tough to have a single assertion per test. To follow the rule, we may have having multiple assertions per object in a single test. The problem with multiple assertions in a single test though, is that if the first one fails for any reason we actually don’t know about other assertions as they will not be executed. And you know the drill: you check assertion failure reason, you fix it and re-run the test. Maybe you are lucky and the test will pass. But maybe it will fail with another assertion. With really fast unit tests this is not a big issue but when it comes to, for example, Selenium tests analysis and failure detection can become cumbersome and for sure time consuming. Fortunately, we can re-think the way we create assertions in our tests thanks to AssertJ’s SoftAssertions .

If you want to use or just check the newest version of Spring with Spring Boot but the current Spring Boot version depends on an older Spring version you need to adjust your Gradle build configuration slightly. For example, as of time of writing this blog post, Spring 4.2.1 and Spring Boot 1.2.5 were current versions. Spring Boot 1.2.5 depends on Spring 4.1.7. So what to do to in order to use Spring 4.2.1 with Spring Boot 1.2.5? Have a look at two ways of achieving this: with and without Spring IO Platform.

Recently I moved to Windows 10 and upgraded to the newest Firefox. When I executed my integration tests on my PC with Selenium and Firefox for the first time I saw an extra page was loaded: “Firefox + Windows 10. Perfect together.” Maybe for you - I said to myself - and I immediately looked how to disable it.