[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-2640) Clob management and deadlock

Clob management and deadlock ---------------------------- Key: HHH-2640 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2640 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.2.0.ga Environment: JDK 1.5, Oracle 10g v2 Reporter: Samuel Emangard Priority: Trivial Attachments: Samuel.rar Mapping documents: <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC '-//Hibernate/Hibernate Mapping DTD 3.0//EN' 'http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd'> <hibernate-mapping package="com.toluna.samuel.hibernate.emailtemplate"> <class name="EmailTemplate" table="EmailTemplate"> <id name="id" type="long"> <column name="template_id" not-null="true"/> <generator class="native"/> </id> <property name="name"> <column name="email_name" not-null="false"/> </property> <property name="htmlTextClob" type="clob"> <column name="html_Text" not-null="false"/> </property> <property name="plainTextClob" type="clob"> <column name="plain_Text" not-null="false"/> </property> </class> </hibernate-mapping> Extract also of my Java bean: ublic class EmailTemplate { private long id; private String name; private String plainText = " "; private String htmlText = " "; private Clob plainTextClob; private Clob htmlTextClob; ... Code of the test case: Session ss = HibernateUtil.getSessionFactory().getCurrentSession(); //S_LOGGER.debug("Number of current Hibernate sessions: "+ HibernateUtil.getSessionFactory().getStatistics().getSessionOpenCount()); ss.getTransaction().begin(); EmailTemplate et = (EmailTemplate) ss.load(EmailTemplate.class, new Long("299941536982302")); S_LOGGER.debug(et.getName()); Thread.sleep(5000); S_LOGGER.debug("BEFORE FLUSH"); ss.flush(); S_LOGGER.debug("AFTER FLUSH"); ss.getTransaction().commit(); The generated SQL : The load statement is always generated: /* load com.toluna.samuel.hibernate.emailtemplate.EmailTemplate */ select emailtempl0_.template_id as template1_0_0_, emailtempl0_.email_name as email2_0_0_, emailtempl0_.html_Text as html3_0_0_, emailtempl0_.plain_Text as plain4_0_0_ from EmailTemplate emailtempl0_ where emailtempl0_.template_id=? .... Depending on the implementation of the getter, the following update statement is generated: /* update com.toluna.samuel.hibernate.emailtemplate.EmailTemplate */ update EmailTemplate set email_name=?, html_Text=?, plain_Text=? where template_id=? Here is the getter: Clob getHtmlTextClob() { //1- //return Hibernate.createClob(htmlText != null ? htmlText : " "); //2- return htmlTextClob; } With 1- the update statement is generated With 2- the update statement is not generated Why? Extract of the setter: void setHtmlTextClob(Clob htmlTextClob) { this.htmlTextClob = htmlTextClob; try { if (htmlTextClob != null) { htmlText = HibernateUtil.getStringFromClob(htmlTextClob); //htmlText = "samuel"; } else htmlText = ""; } catch (SQLException e) { throw new RuntimeException(e); } catch (IOException e) { throw new RuntimeException(e); } } I have also another more critical issue which seems tied to the previous: If I write the following piece of test code instead of the one shown above: Session ss = HibernateUtil.getSessionFactory().openSession(); //S_LOGGER.debug("Number of current Hibernate sessions: "+ HibernateUtil.getSessionFactory().getStatistics().getSessionOpenCount()); EmailTemplate et = (EmailTemplate) ss.load(EmailTemplate.class, new Long("299941536982302")); S_LOGGER.debug(et.getName()); Thread.sleep(5000); S_LOGGER.debug("BEFORE FLUSH"); ss.flush(); S_LOGGER.debug("AFTER FLUSH"); As you can see in this piece of code i do not manage transactions explicitly and in that case my 2 java threads generated update statements which never ended: there was a deadlock on the DB. During the last test, If I still did not manage transactions explicitly but I modified the getter like that: Clob getHtmlTextClob() { return htmlTextClob; } Then neither update statements nor deadlock were generated. I wrote this piece of test code to reproduce deadlock I was facing on my Jonas server. Could you please help me to understand this behaviour? Here is anextract of my hibernate.cfg.xml: <property name="connection.url">jdbc:oracle:thin:@192.168.2.7:1521:tlorcl1</property> <property name="connection.username">samuel</property> <property name="connection.password">toluna</property> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> <property name="hibernate.show_sql">true</property> <property name="hibernate.format_sql">true</property> <property name="hibernate.use_sql_comments">true</property> <property name="myeclipse.connection.profile">QA</property> <property name="current_session_context_class">thread</property> Thanks in advance Regards Samuel