How to handle a PSQLException in java?

Question

I have a unique constraint on one of my entities and whenever I get a PSQLException which occurs whenever that constraint is violated, I want to respond with a bad request.

Answer 1

This is quite late, but building on previous responses I was able to solve it as so:

try {
    return this.projectRepository.saveAndFlush(patchedProjectEntity);
} catch (DataIntegrityViolationException e) {
    if (e.getMostSpecificCause().getClass().getName().equals("org.postgresql.util.PSQLException") && ((SQLException) e.getMostSpecificCause()).getSQLState().equals("23505"))
        throw new UniqueConstraintViolationException("", e.getMostSpecificCause());
    throw e;
}

Where UniqueConstraintViolationException is a custom exception and handled with a spring controller advice.