Question

I have an application that I use BoneCP for connection pooling and when I deploy the war to tomcat, it works perfectly. But when I create another war (almost identical, just different skin and DB connection) ans deploy them both the I get the following error when tomcat starts up:

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection,  message from server: "Too many connections"

Note that this does not happen after a period of time, so it is not that I am leaking connections by not closing them, but rather on startup.

My hibernate/boneCP connection properties in my spring config are as follows:

<bean id="sessionFactory"
      class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.connection.provider_class">com.jolbox.bonecp.provider.BoneCPConnectionProvider</prop>
            <prop key="hibernate.connection.driver_class">com.mysql.jdbc.Driver</prop>
            <prop key="hibernate.connection.url">${connection.url}</prop>
            <prop key="hibernate.connection.username">${connection.username}</prop>
            <prop key="hibernate.connection.password">${connection.password}</prop>
            <prop key="bonecp.idleMaxAge">60</prop>
            <prop key="bonecp.idleConnectionTestPeriod">5</prop>
            <prop key="bonecp.partitionCount">3</prop>
            <prop key="bonecp.acquireIncrement">10</prop>
            <prop key="bonecp.maxConnectionsPerPartition">60</prop>
            <prop key="bonecp.minConnectionsPerPartition">20</prop>
            <prop key="bonecp.statementsCacheSize">50</prop>
            <prop key="bonecp.releaseHelperThreads">3</prop>
        </props>
    </property>
....

Anyone got any ideas?

Answer 1

According to this thread:

This is a sign that you have asked
BoneCP to create more connections then
your mysql server is configured to
accept. Either increase the number of
connections mysql will allow (via
mysql administrator) or tell bonecp to
create fewer connections.

By default MySQL allows you to create
just a few connections so I would
start with that first.

P.S. Sorry about the captcha test –
the amount of spambot attempts I get
hit with is unbelievable; I’m going to
turn it down a notch.

You either have to decrease bonecp.maxConnectionsPerPartition, or modify the configuration of your MySQL server to accept 60 * number of instances of your app simultaneous connections.