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Bean Post Processor exercise

Improve your Spring advanced skills 💪

Task

Implement automatic String trimming functionality. So if I pass " Hello " as an argument to my bean’s method, or return it from the bean’s method, it gets automatically trimmed to "Hello".

  • create annotation @Trimmed that you can put on class

  • create annotation @EnableStringTrimming that will enable automatic String trimming for all beans that are annotated with @Trimmed

  • create TrimmedAnnotationBeanPostProcessor that will check for beans that are marked with @Trimmed,

  • create a proxy of those classes, and override methods. Proxy methods should:

    • trim all String arguments

    • trim all String return values

  • extract TrimmedAnnotationBeanPostProcessor into a separate StringTrimmingConfiguration that is imported by @EnableStringTrimming

To verify your configuration, run BeanPostProcessorTest.java

Pre-conditions ❗

You're supposed to be familiar with Spring

How to start ❓

  • Just clone the repository and start implementing the todo section, verify your changes by running tests
  • If you don't have enough knowledge about this domain, check out the links below
  • Don't worry if you got stuck, checkout the exercise/completed branch and see the final implementation

Related materials ℹ

todo

🆕 First time here? – See Introduction