Tomcat - JDBC driver unregisted when the web application stops

SEVERE: A web application registered the JBDC driver [oracle.jdbc.driver.OracleDriver] but failed to unregister it when the web application was stoppe

Solution:
<context-param><br><param-name>webAppRootKey</param-name><br><param-value>webapp.root</param-value><br></context-param>