Montags and Clarisse's realtionship is weird. If she had not died I think they would have become a lot closer throughout the book. Clarisse seemed to bring out a different side of Montag. They way she would ask him questions and make things for him.
JKS stands for Java KeyStore. It is a repository of certificates (signed public keys) and [private] keys. You can export a certificate stored in a JKS file into a certificate file. You can use the keytool utility found in Java distributions to maintain your JKS trust and key repositories.
The web configuration is a new experimental lightweight configuration created around JBoss Web that will follow the developments of the Java EE 6 web profile. Besides being a servlet/jsp container (and this is the most relevant difference with a pure Ttomcat Web Server), it provides support for JPA and JTA/JCA.