求救！关于hibernateTemplate连接数的问题

DAOpublic class PayDAO {

private ApplicationContext bf=new ClassPathXmlApplicationContext("applicationContext.xml");
private HibernateTemplate hibernateTemplate=(HibernateTemplate)bf.getBean("hibernateTemplate");

public List<Company> getCompanys(){
String queryString="from Company";
List<Company> list=hibernateTemplate.find(queryString);
return list;
}
}配制文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"
       default-lazy-init="false">
       
   <!-- Activates scanning of @Autowired -->
   <context:annotation-config/>   <!-- Activates scanning of @Repository and @Service -->
   <context:component-scan base-package="com.contract"/>    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>               
            </list>
        </property>
    </bean>
     <!-- DataSource -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxActive" value="100"/>
        <property name="maxWait" value="1000"/>
        <property name="poolPreparedStatements" value="true"/>
        <property name="timeBetweenEvictionRunsMillis" value="300000"/>
        <property name="defaultAutoCommit" value="true"/>
    </bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="configLocation" value="classpath:hibernate.cfg.xml"/>
 <property name="hibernateProperties">
            <value>
             hibernate.show_sql=true
                hibernate.dialect=${hibernate.dialect}
                hibernate.query.substitutions=true 'Y', false 'N'
                hibernate.cache.use_second_level_cache=true
                hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
                hibernate.max_fetch_depth=5
                hibernate.connection.release_mode=auto
            </value>
            <!-- Turn batching off for better error messages under PostgreSQL -->
            <!-- hibernate.jdbc.batch_size=0 -->
        </property>
</bean>



<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>




    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>
</beans>这样子，当我运行了一段时间后，就会报连接数过多不能创建连接数的错。
我记得这些都是hibernateTemplate自动管理的啊。
请教，要怎么解决呢？
org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Data source rejected establishment of connection,  message from server: "Too many connections")
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1225)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:111)