带有休眠和超时的tomcat数据源，等待空闲对象异常

Question

I am using Tomcat Data-source with hibernate

<Resource 
auth="Container" 
driverClassName="com.mysql.jdbc.Driver" 
maxActive="8" maxIdle="8" maxWait="10000"
username="*****"  
name="jdbc/sakila" password="*****"
type="javax.sql.DataSource" 
url="jdbc:mysql://localhost/sakila"/>

and in hibernate

<propertyname="hibernate.connection.datasource">java:comp/env/jdbc/sakila</property>

after implementing I am facing the following exception

java.util.NoSuchElementException: Timeout waiting for idle object

this exception occur at night , when I am sleeping :) and as I go office at morning I found this exception. I think this is connection pooling exception that tomcat provide?

please update me !

This it is suitable to use tomcat Data-source with hibernate? or we should use C3P0 third party connection polling?;

currently, looking solution for tomcate data source

Answer 1

The number of the connections in the pool grows automatically until it reaches maxActive.

Per Tomcat documentation, maxActive is:

The maximum number of active connections that can be allocated from this pool at the same time. The default value is 100

You severly restricted the maximum number of the simultaneous database connections to 8.

I would suggest to increase this number to at least 50. Then start monitoring the number of the connections in the pool. If the number of the connections steadily grows, whitout the growth of the usage of your web application, you might have a connection leak. If you confirm that, you would have to investigate that leak.

Unlike the "olden days", if you connect to the datavase via Hibernate and manage transactions with, say, Spring, connection leaks are quite rare.