Why should I add the driver class dependency in pom when the driver-class tag is defined in...

I have a Spring boot Hibernate web application. DB is Oracle.

There's something that I cant understand : Why should I add the driver class dependency in pom.xml

<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc7</artifactId>
<version>12.1.0</version>
</dependency>


When the driver is already defined in the tag in standalone.xml of my Jboss AS :

<driver name="oracle" module="com.oracle.ojdbc8">
<driver-class>oracle.jdbc.OracleDriver</driver-class>
</driver>


NB : I have a database connection pool on a Java EE application server (Jboss)

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