How to open JAR file via JNLP file in i3?

I’m giving an exam in Cisco NetAcad and it wants to open an java application PacketTracer using JNLP file! But the application never open. I know there’s nothing wrong with PackeTracer because I use it daily. Is there somekind of configuration or setting that needs to changed to open JNLP files using xdg-open?

JNLP files are opened using a program called javaws which comes with icedtea-web package

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