We have a java app which uses Java Web Start. The jnlp file is configured with [j2se version=\"1.5+\"]. So if JRE 1.5 and 1.6 are installed, the app is run on 1.6.
I think what you want is:
<j2se version="1.5.0_17" />
<j2se version="1.5.0_16" />
<j2se version="1.5.0_15" />
<j2se version="1.5.0_14" />
<j2se version="1.5.0_13" />
<j2se version="1.5.0_12" />
<j2se version="1.5.0_11" />
<j2se version="1.5.0_10" />
<j2se version="1.5.0_09" />
<j2se version="1.5.0_08" />
<j2se version="1.5.0_07" />
See: http://docs.oracle.com/javase/1.5.0/docs/guide/javaws/developersguide/syntax.html#resources
The j2se element specifies what Java 2 SE Runtime Environment (JRE) versions an application is supported on, as well as standard parameters to the Java Virtual Machine. If several JREs are specified, this indicates a prioritized list of the supported JREs, with the most preferred version first.
I've also looked at the Java 6 / Java 7 at it looks like it will work there as well.
http://docs.oracle.com/javase/6/docs/technotes/guides/javaws/developersguide/syntax.html#resources
http://docs.oracle.com/javase/7/docs/technotes/guides/javaws/developersguide/syntax.html#resources
It's not pretty, but this might work.
<j2se version="1.5.0_07 1.5.0_08 1.5.0_09 1.5.0_10 1.5.0_11
1.5.0_12 1.5.0_13 1.5.0_14 1.5.0_15 1.5.0_16 1.5.0_17" />
I broke the line so you can read it, but it's all one line in the jnlp.