<![CDATA[JavaRanch: Latest posts for the topic "Hibernate: Mapping a sequence to a serial (autoincr) field (Postgresql)"]]> http://www.coderanch.com/forums/t/78/Object-Relational-Mapping/Hibernate-Mapping-sequence-serial-autoincr JForum - http://www.jforum.net Hibernate: Mapping a sequence to a serial (autoincr) field (Postgresql)
I never really used Hibernate before, in fact I use it since yesterday. After I successfully found
all the required libraries on internet, I made fictional classes and
tables about a library.

Basically this is my class diagram:


My goal is to check how hibernate handles inheritance. However when I'm trying to insert an author into my database I get the following error:

63 [main] INFO org.hibernate.cfg.Environment - Hibernate 3.3.1.GA
110 [main] INFO org.hibernate.cfg.Environment - hibernate.properties not found
125 [main] INFO org.hibernate.cfg.Environment - Bytecode provider name : javassist
156 [main] INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling
391 [main] INFO org.hibernate.cfg.Configuration - configuring from resource: /hibernate.cfg.xml
391 [main] INFO org.hibernate.cfg.Configuration - Configuration resource: /hibernate.cfg.xml
953 [main] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : Author.hbm.xml
1281 [main] INFO org.hibernate.cfg.HbmBinder - Mapping class: Author -> authors
1375 [main] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : Book.hbm.xml
1485 [main] INFO org.hibernate.cfg.HbmBinder - Mapping class: Book -> books
1906 [main] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : Novel.hbm.xml
2031 [main] INFO org.hibernate.cfg.HbmBinder - Mapping class: Novel -> novels
2047 [main] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : Comic.hbm.xml
2141 [main] INFO org.hibernate.cfg.HbmBinder - Mapping class: Comic -> comics
2156 [main] INFO org.hibernate.cfg.Configuration - Configured SessionFactory: null
2172 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - Using Hibernate built-in connection pool (not for production use!)
2172 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - Hibernate connection pool size: 1
2188 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - autocommit mode: false
2313 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - using driver: org.postgresql.Driver at URL: jdbc:postgresql://localhost/TestHibernate
2313 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - connection properties: {user=postgres, password=****}
2641 [main] INFO org.hibernate.cfg.SettingsFactory - RDBMS: PostgreSQL, version: 8.2.4
2641 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC driver: PostgreSQL Native Driver, version: PostgreSQL 8.3 JDBC4 with SSL (build 604)
2719 [main] INFO org.hibernate.dialect.Dialect - Using dialect: org.hibernate.dialect.HSQLDialect
2735 [main] INFO org.hibernate.transaction.TransactionFactoryFactory - Using default transaction strategy (direct JDBC transactions)
2735 [main] INFO org.hibernate.transaction.TransactionManagerLookupFactory - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
2735 [main] INFO org.hibernate.cfg.SettingsFactory - Automatic flush during beforeCompletion(): disabled
2735 [main] INFO org.hibernate.cfg.SettingsFactory - Automatic session close at end of transaction: disabled
2735 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC batch size: 15
2735 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC batch updates for versioned data: disabled
2750 [main] INFO org.hibernate.cfg.SettingsFactory - Scrollable result sets: enabled
2750 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC3 getGeneratedKeys(): disabled
2750 [main] INFO org.hibernate.cfg.SettingsFactory - Connection release mode: auto
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Default batch fetch size: 1
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Generate SQL with comments: disabled
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Order SQL updates by primary key: disabled
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Order SQL inserts for batching: disabled
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
2766 [main] INFO org.hibernate.hql.ast.ASTQueryTranslatorFactory - Using ASTQueryTranslatorFactory
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Query language substitutions: {}
2766 [main] INFO org.hibernate.cfg.SettingsFactory - JPA-QL strict compliance: disabled
2766 [main] INFO org.hibernate.cfg.SettingsFactory - Second-level cache: enabled
2781 [main] INFO org.hibernate.cfg.SettingsFactory - Query cache: disabled
2797 [main] INFO org.hibernate.cfg.SettingsFactory - Cache region factory : org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge
2797 [main] INFO org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge - Cache provider: org.hibernate.cache.NoCacheProvider
Hibernate: call next value for authors_id_seq
2797 [main] INFO org.hibernate.cfg.SettingsFactory - Optimize cache for minimal puts: disabled
2797 [main] INFO org.hibernate.cfg.SettingsFactory - Structured second-level cache entries: disabled
2813 [main] INFO org.hibernate.cfg.SettingsFactory - Echoing all SQL to stdout
2813 [main] INFO org.hibernate.cfg.SettingsFactory - Statistics: disabled
2813 [main] INFO org.hibernate.cfg.SettingsFactory - Deleted entity synthetic identifier rollback: disabled
2813 [main] INFO org.hibernate.cfg.SettingsFactory - Default entity-mode: pojo
2828 [main] INFO org.hibernate.cfg.SettingsFactory - Named query checking : enabled
3047 [main] INFO org.hibernate.impl.SessionFactoryImpl - building session factory
3891 [main] INFO org.hibernate.impl.SessionFactoryObjectFactory - Not binding factory to JNDI, no JNDI name configured
4360 [main] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: 42601
4375 [main] ERROR org.hibernate.util.JDBCExceptionReporter - ERROR: syntax error at or near "call"
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not get next sequence value
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:90)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:119)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:122)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:534)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:526)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:522)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:342)
at $Proxy0.saveOrUpdate(Unknown Source)
at TestHibernate.main(TestHibernate.java:13)
Caused by: org.postgresql.util.PSQLException: ERROR: syntax error at or near "call"
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1608)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1343)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:194)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:451)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:350)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:254)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:98)
... 15 more


Since I'm a new child with Posgresql and Hibernate, I don't know where to head to solve my problem. I tried to log the queries made by Hibernate, but I got now luck.

Any ideas?

SQL 
CREATE DATABASE "TestHibernate"
  WITH OWNER = postgres
       ENCODING = 'UTF8'
       TABLESPACE = pg_default;

CREATE TABLE authors
(
  id bigserial NOT NULL,
  name character varying(150) NOT NULL,
  CONSTRAINT authors_pkey PRIMARY KEY (id)
) 
WITHOUT OIDS;
ALTER TABLE authors OWNER TO postgres;

CREATE SEQUENCE authors_id_seq
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1
  CACHE 1;
ALTER TABLE authors_id_seq OWNER TO postgres;



CREATE TABLE books
(
  id bigserial NOT NULL,
  isbn character varying(25) NOT NULL,
  title character varying(250) NOT NULL,
  author bigint,
  price money,
  CONSTRAINT books_pkey PRIMARY KEY (id),
  CONSTRAINT books_author_fkey FOREIGN KEY (author)
      REFERENCES authors (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION,
  CONSTRAINT books_isbn_key UNIQUE (isbn)
) 
WITHOUT OIDS;
ALTER TABLE books OWNER TO postgres;

CREATE SEQUENCE books_id_seq
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1
  CACHE 1;
ALTER TABLE books_id_seq OWNER TO postgres;

CREATE TABLE comics
(
  id bigint NOT NULL,
  drawer bigint,
  CONSTRAINT comics_pkey PRIMARY KEY (id),
  CONSTRAINT comics_drawer_fkey FOREIGN KEY (drawer)
      REFERENCES authors (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION,
  CONSTRAINT comics_id_fkey FOREIGN KEY (id)
      REFERENCES books (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
) 
WITHOUT OIDS;
ALTER TABLE comics OWNER TO postgres;

CREATE TABLE novels
(
  id bigint NOT NULL,
  "pageCount" integer,
  CONSTRAINT novels_pkey PRIMARY KEY (id),
  CONSTRAINT novels_id_fkey FOREIGN KEY (id)
      REFERENCES books (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
) 
WITHOUT OIDS;
ALTER TABLE novels OWNER TO postgres;


hibernate.cfg.xml 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<property name="connection.driver_class">org.postgresql.Driver</property>
		<property name="connection.url">jdbc:postgresql://localhost/TestHibernate</property>
		<property name="connection.username">postgres</property>
		<property name="connection.password">qwerty</property>
		
		<property name="connection.pool_size">1</property>
		<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
		<property name="current_session_context_class">thread</property>
		<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
		<property name="show_sql">true</property>

		<mapping resource="Author.hbm.xml"/>
		<mapping resource="Book.hbm.xml"/>
		<mapping resource="Novel.hbm.xml"/>
		<mapping resource="Comic.hbm.xml"/>
	</session-factory>
</hibernate-configuration>


Author.hbm.xml 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="Author" table="authors">
		<id name="id" unsaved-value="null">
			<generator class="sequence">
				<param name="sequence">authors_id_seq</param>
			</generator>
		</id>
		<property name="name" />
	</class>
</hibernate-mapping>


TestHibernate.java 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class TestHibernate {
	public static void main(String[] args) {
		SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
		Session session = sessionFactory.getCurrentSession();
		session.beginTransaction();
		
		Author a1 = new Author("Maurice");
		session.saveOrUpdate(a1);
		
		session.getTransaction().commit();
		sessionFactory.close();
		
		/*Book b1 = new Roman("1321465-65", "Maurice au pays des merveilles", a1, 455, 65.22);
		session.update(b1);
		
		Author a2 = new Author("Linda");
		session.update(a2);
		
		Book b2 = new Roman("735r461-32", "Les aventures de Linda", a2, 45, 25.39);
		session.update(b2);
				
		session.getTransaction().commit();
		sessionFactory.close();*/
	}
}


Author.java 
public class Author {
	private Integer id;
	private String name;
	
	public Author(String name) {
		this(null, name);
	}
	
	public Author() {
		this(null);
	}
	
	private Author(Integer id, String name) {
		this.id = id;
		this.name = name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	private void setId(Integer id) {
		this.id = id;
	}

	public Integer getId() {
		return id;
	}
}

]]> http://www.coderanch.com/forums/posts/preList/426247/1890696 http://www.coderanch.com/forums/posts/preList/426247/1890696 Hibernate: Mapping a sequence to a serial (autoincr) field (Postgresql)
I've found my mistake (that I copy/pasted from a tutorial).

My problem was in the dialect specified in hibernate.cfg.xml. Basically Hibernate was trying to speak HSQL with Postgres.

So I changed: 
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>


To: 
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
]]> http://www.coderanch.com/forums/posts/preList/426247/1891575 http://www.coderanch.com/forums/posts/preList/426247/1891575