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:

<property name="hibernate.dialect" value="com.my.app.AppOracleDialect" />

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.

Answer 2

I solved the problem as follows. Created an extension for Oracle12cDialect. Limited the maximum/minimum value of columns to SQL

package ru.mvawork.hibernate;

import org.hibernate.dialect.Oracle12cDialect;

@SuppressWarnings("unused")
public class CustomOracleDialect extends Oracle12cDialect {

    @Override
    public String getQuerySequencesString() {
        return "select SEQUENCE_OWNER, SEQUENCE_NAME, greatest(MIN_VALUE,         -9223372036854775807) MIN_VALUE,\n"+
                "Least(MAX_VALUE, 9223372036854775808) MAX_VALUE, INCREMENT_BY,     CYCLE_FLAG, ORDER_FLAG, CACHE_SIZE,\n"+
                "Least(greatest(LAST_NUMBER, -9223372036854775807), 9223372036854775808) LAST_NUMBER,\n"+
                "PARTITION_COUNT, SESSION_FLAG, KEEP_VALUE\n"+
                "from all_sequences";
    }

}

In the application.properties file referred to a dialect implementation

spring.jpa.properties.hibernate.dialect=ru.mvawork.hibernate.CustomOracleDialect

You can recreate sequences by limiting the minimum and maximum values. In my case, I can 't do it. The primary keys that I use have the dimension Number (12), which falls within the range limit from -9223372036854775807 to 9223372036854775808 with a large margin

Answer 3

add (or Change if already there) the dialect property as below in to "application.properties".

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect

Answer 4

You simple used the dafault MAX_VALUE of a sequence, which is too high for the Java LONG datatype.

Fortunatelly you may any time reset the MAX_VALUE with ALTER SEQUENCE to a lower number that will cause no problems.

Example

CREATE SEQUENCE SEQ_TEST START WITH 1 INCREMENT BY 1 NOCYCLE;


select MAX_VALUE from ALL_SEQUENCES where SEQUENCE_NAME = 'SEQ_TEST';

 MAX_VALUE
----------
9999999999999999999999999999


ALTER SEQUENCE SEQ_TEST
  MAXVALUE 9223372036854775807;

select MAX_VALUE from ALL_SEQUENCES where SEQUENCE_NAME = 'SEQ_TEST';

 MAX_VALUE
----------
9223372036854775807

and BTW

it looks strange that hibernate tries to read metadata about all sequences, not only about used in my application.

Hibernate uses select * from all_sequences as an Oracle Dialect to get the sequence information. Note that ALL_SEQUENCES does not mean all existing sequences, but all sequences, that your Hibernate database user (DBUSER from the connection pool) is granted to use - which is of course absolute correct.