Version 7 is a new release of the full Java client version. Below are links related to security

Java 7 – Security Features in this new release

QUOTE: All of the new features and improvements to existing features are cryptography-related and generally related to support for SSL/TLS in the JSSE (Java Secure Socket Extension) APIs. Certification path processing, which is generally SSL/TLS-related anyway, has been strengthened. Finally, a native provider has been added with several Elliptic Curve Cryptography (ECC) algorithms has been added.

Java 7 – Detailed Security Features