How to make java web start launch automatically without double click on the JNLP [duplicate]

Possible solutions

1) Change the behavior in the browser to ask the user what to do when he click on a JNLP link. Then the user can select Open with: Java web start launcher or save file.

edit It's working in Firefox but it doesn't work with Chrome: see related bug reports 10877 and the open issues

2) Provide a script to the user which executes
javaws https://example.com/your_application.jnlp

An example for demonstration (application link taken from Oracle tutorial: Running a Java Web Start Application)

javaws https://docs.oracle.com/javase/tutorialJWS/samples/deployment/NotepadJWSProject/Notepad.jnlp

This will open a simple Java application.

edit For the fearless there is a hacky solution for Chrome.

1. close Chrome, and keep in mind to always make a copy of the files altered in the next steps ;-)
2. find in the Chrome library chrome.[so|dll] the bytes jnlp and patch them as e.g. jnl-
3. find in your Chrome user profile directory the file Preferences and amend it as ...

.

"download": {    ...    "extensions_to_open": "jnlp",    ...},

Next time you click on a link to a JNLP file it will be opened automatically (with the application which is assigned to open this file type, normally it's javaws).

The property was found after having a look into the source pref_names.cc. But Chrome treat the extension jnlp as dangerous that's why we need to patch the library as well.