config 1:
◆tomcat#conf#server.xml
<Resource auth="Container" driverClassName="com.mysql.jdbc.Driver" maxIdle="10" maxTotal="100" minEvictableIdleTimeMillis="10000"
numTestsPerEvictionRun="10" removeAbandonedOnBorrow="true" removeAbandonedTimeout="10" type="javax.sql.DataSource" url="jdbc:mysql://dbserver:3306/***"
username="***"  password="***" name="jdbc/tomcatDataSource" validationQuery="SELECT NOW() FROM DUAL"/>
◆WEB-INF/web.xml
<resource-ref>
    <description>tomcatDataSource</description>
    <res-ref-name>jdbc/tomcatDataSource</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
    <res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
◆spring config
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:comp/env/jdbc/tomcatDataSource" />
</bean>

config 2:
◆spring config
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property>
    <property name="url"><value>jdbc:mysql://dbserver:3306/***</value></property>
    <property name="username"><value>***</value></property>
    <property name="password"><value>***</value></property>
</bean>