Java 7はセキュアレス。しかしJava 6のサポート終了のアナウンス

After February 2013, Oracle will no longer post updates of Java SE 6 to
its public download sites. Existing Java SE 6 downloads already posted
as of February 2013 will remain accessible in the Java Archive
on Oracle Technology Network. Developers and end-users are encouraged
to update to more recent Java SE versions that remain available for
public download. For enterprise customers, who need continued access to
critical bug fixes and security fixes as well as general maintenance for
Java SE 6 or older versions, long term support is available through Oracle Java SE Support .