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Sometimes, I find some class names including Aware such as ApplicationContextAware and MessageSourceAware (spring). Does this Aware have any special meanings or is it a famous rule?
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Class names should be nouns, in mixed case with the first letter of each internal word capitalized. Try to keep your class names simple and descriptive. Use whole words-avoid acronyms and abbreviations (unless the abbreviation is much more widely used than the long form, such as URL or HTML).
A class name is an identifier—a series of characters consisting of letters, digits, underscores ( _ ) and dollar signs ( $ ) that does not begin with a digit and does not contain spaces.
Class names should be nouns. E.g. Calculator instead of Calculate . They should always be singular.
A valid name should start with an underscore (_), a hyphen (-) or a letter (a-z)/(A-Z) which is followed by any numbers, hyphens, underscores, letters. It cannot start with a digit, starting with the digit is acceptable by HTML5 but not acceptable by CSS.
Those are not classes, are interfaces. The name is just a convention on Spring meaning that some special framework object is going to be injected to that class if it is managed by the framework.
Directly from the docs of ApplicationContextAware:
Interface to be implemented by any object that wishes to be notified of the ApplicationContext that it runs in.
In this case, the bean that implements this interface will get a reference to the ApplicationContext managing the application.
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