Hibernate could not fetch the SequenceInformation from the database

Question

I have recently updated hibernate in my application to 5.4.4.Final. And now, I have faced with the following exception during deployment.

ERROR [org.hibernat         


        

Answer 1

In the end, I came up to the following solution:

1. Create a sequence information extractor that extends SequenceInformationExtractorOracleDatabaseImpl:

public class AppSequenceInformationExtractor extends SequenceInformationExtractorOracleDatabaseImpl 
{
   /**
    * Singleton access
    */
   public static final AppSequenceInformationExtractor INSTANCE = new AppSequenceInformationExtractor();
   
   @Override
   protected Long resultSetMinValue(ResultSet resultSet) throws SQLException {
      return resultSet.getBigDecimal("min_value").longValue();
   }
}

2. Create a hibernate dialect that extends Oracle12cDialect:

public class AppOracleDialect extends Oracle12cDialect
{
   @Override
   public SequenceInformationExtractor getSequenceInformationExtractor() {
      return AppSequenceInformationExtractor.INSTANCE;
   }
   
   @Override
   public String getQuerySequencesString() {
      return "select * from user_sequences";
   }
}

3. And then use this dialect in the persistence.xml:

As for the method getQuerySequencesString() overriding and usage USER_SEQUENCES instead of ALL_SEQUENCES it's debatable (See HHH-13322 and HHH-14022). But, in my case, the USER_SEQUENCES usage is preferable.