[Spring] Spring Data JPA - “No Property Found for Type” Exception

Problem
I am using Spring data as my persistence-tier implementation.
As I try to add custom functionality to spring data repository, it throw “No Property Found for Type” Exception.

How-To
As per the spring data documentation, if your repository is PostOfficeRepository, the implementation of your custom repository should be name as PostOfficeRepositoryImpl, that's why it throws the exception.

Reference
[1] https://stackoverflow.com/questions/19583540/spring-data-jpa-no-property-found-for-type-exception