在c3p0配置上约30分钟后，应用程序在tomcat上未响应

Question

我对c3p0有问题。 上一次我在应用程序中将c3p0配置为dataSource，是因为Quartz Scheduler为每个检查打开了新连接，现在可以了，但是从这时起，应用程序在30分钟左右（有时更长）后没有响应。 在catalina或应用程序日志文件中没有日志。 其他应用程序可在同一服务器上正常工作。 在此应用程序上，我得到了404。我返回了默认的Spring数据源，并删除了配置，一切正常。

是什么原因引起的？

Tomcat 8.0.21 c3p0.version 0.9.5.1 Hibernate version 4.3.1.Final

组态

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${db.driver}" />
    <property name="jdbcUrl" value="${db.url}" />
    <property name="user" value="${db.username}" />
    <property name="password" value="${db.password}" />
</bean>

<property name="hibernateProperties">
        <props>
            <!-- HIBERNATE CONFIGURATION -->
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <!-- <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop> -->
            <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
            <prop key="hibernate.connection.useUnicode">true</prop>
            <prop key="hibernate.generate_statistics">true</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.cache.use_second_level_cache">true</prop>
            <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory
            </prop>
            <prop key="hibernate.cache.use_query_cache">true</prop>
            <prop key="hibernate.cache.provider_class">net.sf.ehcache.hibernate.EhCacheProvider</prop>
            <prop key="hibernate.cache.provider_configuration_file_resource_path">ehcache.xml</prop>

            <!-- HIBERNATE SEARCH CONFIGURATION -->
            <prop key="hibernate.search.default.directory_provider">filesystem</prop>
            <prop key="hibernate.search.default.indexBase">${hibernate.search.local}</prop>

            <!-- CONNECTIONS POOLING CONFIGURATION -->
            <prop key="hibernate.c3p0.acquire_increment">1</prop>
            <prop key="hibernate.c3p0.idle_test_period">1</prop>
            <prop key="hibernate.c3p0.max_size">60</prop>
            <prop key="hibernate.c3p0.max_statements">0</prop>
            <prop key="hibernate.c3p0.min_size">30</prop>
            <prop key="hibernate.c3p0.timeout">0</prop>
        </props>
    </property>
</bean>

使用新设置更新：

            <prop key="hibernate.c3p0.acquire_increment">1</prop>
            <prop key="hibernate.c3p0.idle_test_period">1000</prop>
            <prop key="hibernate.c3p0.max_size">60</prop>
            <prop key="hibernate.c3p0.max_statements">0</prop>
            <prop key="hibernate.c3p0.min_size">20</prop>
            <prop key="hibernate.c3p0.timeout">100</prop>

一位使用者，还是1小时40分钟