Warn about non-static ConfigurationClassPostProcessor declarations on @Configuration classes

Question

I use Spring 4.2.6.RELEASE. During initialization of my app I get such a warning:

[WARN] org.springframework.context.annotation.ConfigurationClassPostPr

Answer 1

Maybe this helps (or not)...

@RunWith(SpringRunner.class)
@DataJpaTest
public class TestMyImpl {
...

I'm using 4.3.4.RELEASE and have the following warning for the code block above:

2016-12-30 07:33:04.296 WARN 2000 --- [ main] o.s.c.a.ConfigurationClassPostProcessor : Cannot enhance @Configuration bean definition 'embeddedDataSourceBeanFactoryPostProcessor' since its singleton instance has been created too early. The typical cause is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor return type: Consider declaring such methods as 'static'.

Since I use @DataJpaTest which autoconfigures the test database (h2 in this case) by replacing any dataSource it finds, the behaviour is expected and wanted. The warning is a confirmation of the overriding behaviour of @DataJpaTest.

@RunWith(SpringRunner.class)
@DataJpaTest
@AutoConfigureTestDatabase(replace=Replace.NONE)
public class TestMyImpl {
...

By disabling the autoconfiguration (as shown above) the warning disappears. The datasource can now be configured as usual.