I have some hardware that I have to connect from time to time that is pretty old, for which the JNLP file specifies <j2se version="1.5+" />. Unfortunately this JNLP does not work with anything newer ...

A clear and concise description of what the bug is. After starting Minecraft with Valkyrie installed and the latest java version from java.com, I still get a message that I am using a outdated version ...