private static final ViolatedConstraintNameExtracter EXTRACTER = new TemplatedViolatedConstraintNameExtracter() {

        private final Class<?> psqlExceptionClass;
        private final Method getServerErrorMessageMethod;
        private final Method getConstraintMethod;

        {
            Class<?> psqlExceptionClass;
            Method getServerErrorMessageMethod;
            Method getConstraintMethod;

            try {
                Class<?> clazz = Class.forName("org.postgresql.util.PSQLException");
                psqlExceptionClass = clazz;
                getServerErrorMessageMethod = clazz.getDeclaredMethod("getServerErrorMessage");
                getConstraintMethod = getServerErrorMessageMethod.getReturnType().getDeclaredMethod("getConstraint");
            } catch (Exception ex) {
                psqlExceptionClass = null;
                getServerErrorMessageMethod = null;
                getConstraintMethod = null;
            }

            this.psqlExceptionClass = psqlExceptionClass;
            this.getServerErrorMessageMethod = getServerErrorMessageMethod;
            this.getConstraintMethod = getConstraintMethod;
        }

        @Override
        protected String doExtractConstraintName(SQLException sqle) throws NumberFormatException {
            final SQLException sqlException = NewJdbcExceptionHelper.extractExceptionUsingSQLState(sqle);
            if (psqlExceptionClass != null && psqlExceptionClass.isInstance(sqlException)) {
                try {
                    Object serverErrorMessage = getServerErrorMessageMethod.invoke(sqlException);
                    if (serverErrorMessage != null) {
                        return (String) getConstraintMethod.invoke(serverErrorMessage);
                    }
                } catch (Exception e) {
                    // Should never happen, so lets motivate the user to report cases when it happens
                    throw new RuntimeException("Something in the PostgreSQL integration went wrong. Please report this issue!", e);
                }
            }

            return null;
        }
    }