[tomcat启动报错]registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped

环境：一个tomcat ,一个工程配置了多数据源，在启动的时候报如下错误：

SEVERE: The web application [/qdp-resource-job] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/qdp-resource-job] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Create-827239851] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Destroy-827239851] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Create-913636676] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Destroy-913636676] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Create-789799328] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Destroy-789799328] but has failed to stop it. This is very likely to create a memory leak.
Aug 14, 2017 3:23:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/qdp-resource-job] appears to have started a thread named [Druid-ConnectionPool-Create-927599675] but has failed to stop it. This is very likely to create a memory leak.

解决方法：在多数据源配置的时候，只配置一个在启动的时候进行初始化，其他的不动，如下：

<!-- 第一数据源  -->
    <bean name="dataSourceResource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="url" value="${jdbc.url}" /> 
        <property name="username" value="${jdbc.username}" /> 
        <property name="password" value="${jdbc.password}" /> 
        <property name="initialSize" value="${jdbc.initialSize}" /> 
        <property name="minIdle" value="${jdbc.minIdle}" /> 
        <property name="maxActive" value="${jdbc.maxActive}" /> 
        <property name="maxWait" value="${jdbc.maxWait}" /> 
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}" /> 
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}" /> 
        <property name="validationQuery" value="${jdbc.validationQuery}" />
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}" /> 
        <property name="testOnBorrow" value="${jdbc.testOnBorrow}" /> 
        <property name="testOnReturn" value="${jdbc.testOnReturn}" /> 
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}" /> 
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}" /> 
        <property name="filters" value="${jdbc.filters}" />
        <property name="logAbandoned" value="true" />
        <property name="proxyFilters">
            <list>
                <ref bean="log-filter"/>
            </list>
        </property>
    </bean>
    <!-- 第二数据源  -->
    <bean name="dataSourceCustomer" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="url" value="${customer.url}" /> 
        <property name="username" value="${customer.username}" /> 
        <property name="password" value="${customer.password}" /> 
    </bean>
    
    <!-- 第三数据源  -->
    <bean name="dataSourceBuilding" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="url" value="${building.url}" /> 
        <property name="username" value="${building.username}" /> 
        <property name="password" value="${building.password}" /> 
    </bean>

第二和第三数据源只保留最基础的url 、username、password 三个配置即可！