Hi, Craig:
Thanks for your reply.
I've just discovered where the error was (and, as I supposed, it was my fault).
Before adding the PostgreSQL dependency, I had this one, some lines before:
<dependency>
<groupId>${jdbcDriver.groupId}</groupId>
<artifactId>${jdbcDriver.artifactId}</artifactId>
<version>${jdbcDriver.version}</version>
<scope>test</scope>
</dependency>
And that scope parameter, made Maven ignore the dependency until the test phase...
Once removed, everything works fine.
Thank you very much.
Santiago.