Is it possible to prompt or force a user to upgrade their JVM with a JNLP?

I need to prompt users to upgrade from JVM 1.5 to 1.6 when they run my Web Sta开发者_运维技巧rt application. Is this possible using JNLP settings?

From the developers guide:

The tag <j2se version="versionNum"> specifies a platform version, where versionNum is 1.2, 1.3, 1.4, or 1.5.

You can request a specific product version by including a vendor URL in the href attribute. For Sun's JREs, the URL is http://java.sun.com/products/autodl/j2se For example, the following J2SE tag will request any Sun 1.3.1 implementation:

<j2se version="1.3.1*" href="http://java.sun.com/products/autodl/j2se"/>

You can see all the versions of the installed JREs in the Java tab of the Java Control Panel.

I'm guessing you can use '1.6' as versionNum as well...