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Ibernazione:constraintName è nullo in MySQL

Ho trovato la seguente soluzione:

  1. Estendi Hibernate MySQL5Dialect esistente:

    public class MySQL5Dialect extends org.hibernate.dialect.MySQL5Dialect {
    
        /**
        * Pattern to extract violated constraint name from {@link SQLException}.
        */
        private static final Pattern PATTERN = Pattern.compile(".*constraint\\W+(\\w+).*", Pattern.CASE_INSENSITIVE);
    
        private ViolatedConstraintNameExtracter constraintNameExtracter;
    
        public MySQL5Dialect() {
            constraintNameExtracter = new ConstraintNameExtractor();
        }
    
        @Override
        public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() {
            return constraintNameExtracter;
        }
    
        private class ConstraintNameExtractor implements ViolatedConstraintNameExtracter {
    
            @Override
            public String extractConstraintName(SQLException sqle) {
                final String msg = sqle.getMessage();
                final Matcher matcher = PATTERN.matcher(msg);
                String constraintName = null;
                if (matcher.matches()) {
                    constraintName = matcher.group(1);
                }
    
                return constraintName;
            }
    
        }
    
    }
    
  2. Specifica il dialetto appena creato nel file di configurazione di Hibernate (hibernate.cfg.xml):

    <property name="dialect">your.package.MySQL5Dialect</property>
    
  3. Ora getConstraintName() restituirà il nome del vincolo violato effettivo:

    try {
        ...
    } catch (ConstraintViolationException e) {
        LOG.error(String.format("Constraint=%s, code=%d", e.getConstraintName(), e.getErrorCode()));
    }