PropertySourcesPlaceholderConfigurer to load spring properties

Question

I want to load spring properties using a specific format, not yaml nor properties.

I wrote a PropertySourcesPlaceholderConfigurer, which is working perfectly in the UT but...

When I start the Spring Boot app, my PropertySourcesPlaceholderConfigurer is not used to load the spring properties because it's probably loaded after the spring properties.

I try to add the Order annotation or to make the beans static but it didn't works

@Bean
@Order(Ordered.HIGHEST_PRECEDENCE)
MyPropertiesPlaceholderConfigurer myPropertiesPlaceholderConfigurer(String[] myConfigurationFiles) {
    return new MyPropertiesPlaceholderConfigurer(myConfigurationFiles);
}

Any idea ?