hibernate count查询三次后，不报错，无异常，停止了

刚接触hibernate，写了个查询

    public int CountNews() {
        try {

            String sql="select count(*) from News n";

            Query q=getSession().createQuery(sql);
            List<?> list=q.list();
            if (list!=null&&list.size()>0) {
                return Integer.parseInt(list.get(0).toString());
            }else {
                return 0;
            }
        } 

        catch (Throwable e) {
            e.printStackTrace();
        }

        return 0;
    }

我用sql，hql，都会在查询的那一步停止，断点打在上面没问题，就是再往下一步，程序就不动了，什么反应都没有，很奇怪。。
我反复执行这个方法，三次没关系，但是第四次就会出现这个问题，网上找了半天，似乎是session的问题？不是很懂，我现在还要关闭session吗？？怎么关闭？

查完一次就关闭session

这是我相关的配置

 <?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"
       default-autowire="byName" default-lazy-init="true">

    <!-- 属性文件读入 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath*:hibernate.properties</value>
            </list>
        </property>
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${hibernate.connection.driverClassName}"/>
        <property name="url" value="${hibernate.connection.url}"/>
        <property name="username" value="${hibernate.connection.username}"/>
        <property name="password" value="${hibernate.connection.password}"/>
    </bean>

    <!--Hibernate SessionFatory-->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="annotatedClasses">
            <list>
                <value>cn.com.car.base.entity.Car</value>
                <value>cn.com.car.base.entity.XcImage</value>
                <value>cn.com.car.base.entity.Company</value>
                <value>cn.com.car.base.entity.News</value>
            </list>
        </property>


        <property name="hibernateProperties">
            <value>classpath:hibernate.properties</value>
        </property>
    </bean>

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


</beans>