[JBoss] JVM 100% CPU usage using java and c3p0

I have a web application which is deployed in jboss server.

I use java 7 and postgres 9.3 and I use c3p0-0.9.5.2.jar

I have about 3000 users who connect to the system

My problem is that the CPU usage is 100% in Windows Server 2012-R2 after 5 hours of starting the server application. (meaning after load usage of the system)

this is my hardware configuration 16 GB ram and 8 virtual process

I use this configuration in applicationContext-db.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
<bean id="dataSource" class = "com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="org.postgresql.Driver"/>

<property name="jdbcUrl" value="jdbcostgresql://10.60.60.20:5432/prodDB"/>

<property name="user" value="postgres"/>
<property name="password" value="postgres"/>
<!-- pool sizing -->


<property name="initialPoolSize" value="32" />
<property name="minPoolSize" value="30" />
<property name="maxPoolSize" value="300" />
<property name="acquireIncrement" value="10" />
<property name="maxStatements" value="0" />

<!-- retries -->
<property name="acquireRetryAttempts" value="30" />
<property name="acquireRetryDelay" value="1000" /> <!-- 1s -->
<property name="breakAfterAcquireFailure" value="false" />

<!-- refreshing connections -->
<property name="maxIdleTime" value="180" /> <!-- 3min -->
<property name="maxConnectionAge" value="10" /> <!-- 1h -->

<!-- timeouts and testing -->
<property name="checkoutTimeout" value="0" /> <!-- 30s -->
<property name="idleConnectionTestPeriod" value="60" /> <!-- 60 -->
<property name="testConnectionOnCheckout" value="true" />
<property name="preferredTestQuery" value="SELECT 1" />
<property name="testConnectionOnCheckin" value="true" />

</bean>
</beans>


I think that I should change the value of checkoutTimeout

Continue reading...