Question

In our application, we use a graph persistence library which do not implement JPA entity listeners behaviours. In other words, a method annotated with @PrePersist will never be called.

As we discovered the need for such a behaviour, I would like to know if there is a java library that could ease things a little … as an example by returning me a list of objects/methods that need to be called as @PrePersist elements. Do you know such libraries ?

Answer 1

You can try Reflections

Reflections scans your classpath, indexes the metadata, allows you to query it on runtime and may save and collect that information for many modules within your project.

Using Reflections you can query your metadata such as:

• get all subtypes of some type

• get all types/methods/fields annotated with some annotation, w/o annotation parameters matching

• get all resources matching matching a regular expression