Question

I do a project merging Hibernate and Spring in a Java web application, using Tomcat under Linux environment. Due to the Mysql 8 hours timeout problem, we want to use C3P0 to manage a connection pool with our Mysql database.
But when we use it, we have numerous threads that are created. I figured it out beacause I did on each request a print of all of them with a memory status that show me the increasing memory and that kind of threads:

• name: C3P0PooledConnectionPoolManager[identityToken->1hged7o8r13kpj7n1h3ycia|39c446]-HelperThread-#0 daemon: true group! main groupParent: system alive: true interrupted: false
• name: C3P0PooledConnectionPoolManager[identityToken->1hged7o8r13kpj7n1h3ycia|17ec0e8]-AdminTaskTimer daemon: true group! main groupParent: system alive: true interrupted: false

It can produce more than 500 threads like these ones, after enough time.

Here is my Hibernate.cfg.xml:

    <property name="connection.provider_class">
            org.hibernate.connection.C3P0ConnectionProvider</property>
    <property name="hibernate.c3p0.acquire_increment">1</property> 
    <property name="hibernate.c3p0.idle_test_period">5</property>
    <property name="hibernate.c3p0.max_size">100</property> 
    <property name="hibernate.c3p0.max_statements">100</property> 
    <property name="hibernate.c3p0.min_size">10</property> 
    <property name="hibernate.c3p0.timeout">5</property>

    <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/myBase</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password"></property>
    <property name="hibernate.hbm2ddl.auto">update</property>
    <property name="hibernate.default_schema">myProject</property>
    <property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
    <property name="show_sql">false</property>

    <property name="cache.provider_class">
      org.hibernate.cache.NoCacheProvider
    </property>         

I also tried to add a C3P0 propeties file, but except reducing the helper thread number, it don’t delete the unsused thread:

    c3p0.maxStatements=5    

c3p0.maxIdleTime=10

c3p0.numHelperThreads=1

c3p0.testConnectionOnCheckout=true
c3p0.preferredTestQuery=SELECT 1

c3p0.initialPoolSize=1
c3p0.minPoolSize=1
c3p0.maxPoolSize=10

c3p0.acquireIncrement=1
c3p0.idleConnectionTestPeriod=1

Does anyone have an idea of why this happen and how to solve this problem?

Thanks a lot.

Answer 1

Ok I found a combination of properties to solve my problem, keeping in mind that I don’t need a lot of connection at a time:

• c3p0.maxStatements=5
• c3p0.maxIdleTime=10
• c3p0.numHelperThreads=3
• c3p0.testConnectionOnCheckout=true
• c3p0.preferredTestQuery=SELECT 1
• c3p0.initialPoolSize=1
• c3p0.minPoolSize=1
• c3p0.maxPoolSize=1
  c3p0.acquireIncrement=1
• c3p0.idleConnectionTestPeriod=1
• c3p0.maxAdministrativeTaskTime=1

Thanks to everyone