Ending support for Java 1.5
The Vuze client (earlier known as Azureus) requires the Java runtime environment (JRE) in order to function. As a matter of policy Vuze and the Azureus project have remained backward-compatible with version 1.5 of the Java environment, which was released in 2004. However, support for this version from Oracle came to an end in 2009, and so Vuze must move forward to support only newer versions of the Java platform and to phase out support for Java version 1.5. (For more information about Oracle support for older versions of Java, visit http://www.oracle.com/technetwork/java/eol-135779.html).
Vuze is fully compatible with the most recent releases of Java (release family 8) and recommends upgrading to this version. For a short period Vuze will also remain compatible with version 6 and 7 of Java.
You can find out what version of Java is being used by Vuze by selecting “About Vuze" from the Help menu (Windows) or the Vuze menu (Mac OS X).
Release 5700 will be the last version to support Java 1.5
On Windows you can upgrade Java by visiting http://java.com/
On OSX the situation is more complex as there are two varieties of Java. Apple maintained its own version of Java up until Java version 1.6, at which point it stopped development and handed responsibility to Oracle. You can either upgrade to Apple's version 1.6 from http://developer.apple.com/java/download (Not recommended as this is a dead end for you) or upgrade to Oracle's latest 1.8 from http://java.com/. Note that Vuze has two separate installers for each of these JREs so if you switch from Apple to Oracle you will need to reinstall Vuze with the Oracle based installer.
Unfortunately there are a small minority of OSX users who will not be able to update beyond version 1.5 due to Apple/Oracle restrictions.
If you choose not to update your version of Java, you can continue to use your existing Vuze installation; however, we will be unable to provide you with updates and bug fixes unless you update your Java software. If you have questions or problems, visit the Support Forums at http://forum.vuze.com to see if a solution has already been posted. If not, please ask your question or report your problem there.