ll you need to do is add the bean definition to your spring configuration files:
<bean class="org.springframework.web.context.support.ServletContextPropertyPlaceholderConfigurer">
And then you add parameters to Tomcat's context.xml file :
<Parameter name="jdbc.driverClassName" value="className" override="false"/>
<Parameter name="jdbc.url" value="url" override="false"/>
<Parameter name="jdbc.username" value="username" override="false"/>
<Parameter name="jdbc.password" value="password" override="false"/>
Now Spring will find these and replace your values in your data source:
<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}"/>
</bean>
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