See spring-projects/spring-framework#31242

Expected output is:

INFO 1609667 --- [           main] c.itineric.MyBeanFactoryPostProcessor    : name: myBean
INFO 1609667 --- [           main] c.itineric.MyBeanFactoryPostProcessor    : getBeanClassName: com.itineric.MyBean

And it is working with following dependency (and previous versions):

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
  <version>3.1.1</version>
</dependency>

When switching to version 3.1.2

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
  <version>3.1.2</version>
</dependency>

output changes to (bean class name is now null)

INFO 1611385 --- [           main] c.itineric.MyBeanFactoryPostProcessor    : name: myBean
INFO 1611385 --- [           main] c.itineric.MyBeanFactoryPostProcessor    : getBeanClassName: null

More precisely, the fault is with the spring-boot version that switches from 6.0.10 to 6.0.11.

To build and reproduce:

mvn -Pnative package

target/native-hello-world

Point of interest:

The AOT generation process of spring boot 6.0.10, generates the following for MyBean inside target/spring-aot/main/sources/com/itineric/MyConfiguration__BeanDefinitions.java

  public static BeanDefinition getMyBeanBeanDefinition() {
    Class<?> beanType = MyBean.class;
    RootBeanDefinition beanDefinition = new RootBeanDefinition(beanType);
    beanDefinition.setInstanceSupplier(getMyBeanInstanceSupplier());
    return beanDefinition;
  }

With spring boot 6.0.11 we get:

  public static BeanDefinition getMyBeanBeanDefinition() {
    RootBeanDefinition beanDefinition = new RootBeanDefinition();
    beanDefinition.setTargetType(MyBean.class);
    beanDefinition.setInstanceSupplier(getMyBeanInstanceSupplier());
    return beanDefinition;
  }

This makes the bug appear. Changing the generated class from 6.0.11 with the one of 6.0.10 and building the native image again gives the expected output.