Hibernate c3p0 and DBCP connection pooling mechanism

Question

If you don't specify settings in hibernate.cfg.xml what will be default connection pooler and how do you change it? here is hibernate config

<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/POM_IVR</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">XXX</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
    <mapping resource="com/SurveyResults.hbm.xml"/>

  </session-factory>
</hibernate-configuration>

Questions 1. Does c3p0 jar come with hibernate3?

2.If you don't specify c3p0 , does hibernate use it's default connection pooler( how do you know it is not using default, is there a parameter) or DBCP?

3.How do I modify the DCBP paramater for my web application do I have to change the context file conf/catalina/locahost/Applicationame.xml in catalina or hibernate configuration, what do I have to change/add to it do I have to specify the username and password or just parameter?

4.Can someone explain how this works, hibernate request a connection and tomcat will get a connection from pool? if you specify c3p0 does DBCP get by-passed?

5.What if I have 2 web application using the same table/username/password? what is commandeered should they have their own DBCP , c3p0 jar? if conf/context.xml is applied to all application can you specify global parameter for DBCP for application to use?

This is all related to 8 hours connection timeout for mysql, I don't want to change the DB parameters.

JIV JIV · Accepted Answer · 2012-07-09T14:50:56

Yes, c3p0 is part of hibernate: http://www.informit.com/articles/article.aspx?p=353736&seqNum=4

Listing 10.2 Sample Hibernate c3p0 Configuration

hibernate.c3p0.max_size=1
hibernate.c3p0.min_size=0
hibernate.c3p0.timeout=5000
hibernate.c3p0.max_statements=100
hibernate.c3p0.idle_test_period=300
hibernate.c3p0.acquire_increment=2

i believe all your answers are there.

Hibernate c3p0 and DBCP connection pooling mechanism

1 Answers