'Make a JNLP Web-Start applet resizable

We have an applet used to run our app in-browser, but we also provide a JNLP web-start option. When the web-start window launches, it is not resizable or maximizable and we want to make this possible.

I initially thought it be a simple setting in the JNLP file but now I'm not sure. How should I be approaching this?

javaappletjnlpjava-web-start


Solution 1:[1]

There is no setting in the JNLP that caters for a resizable applet viewer (which is what JWS uses to show floating applets).

OTOH a little bit of hackery might get you there. I can recall doing this some (long) time ago. I think from memory it basically involved getParent() in a loop until null, the last component before that was a JFrame. Once you have a reference to the frame, you can call setResizable(true).

In fact, (considers) you might also look into JComponent.getTopLevelAncestor() for getting a reference to the root frame. AFIU that method did not exist when I tried the experiment. (Yes, it was that long ago.)

Of course, an overall better strategy is to create a hybrid application/applet. Embed the applet into a browser, and launch the frame by JWS. This provides full control over the GUI.

Solution 2:[2]

Here's a bit of code I added at the end of my init method that made my applet resizable. My class extends JApplet.

Window window = SwingUtilities.windowForComponent(this);
if (window instanceof JFrame) {
    JFrame frame = (JFrame) window;
    if (!frame.isResizable()) {
        frame.setResizable(true);
    }
}

Hope this helps.

Solution 3:[3]

I still have this problem even though is 2022.

No, I am not part of the dev team and I do not have access to source code.

What I did was use shell script to change the window size in the JNLP file to my liking every time I downloaded the JNLP.

It's not resizable but of course I can change window size in shell script and restart JNLP application.

TMPFILE=/tmp/app-resized.jnlp

cat ~/Downloads/app.jnlp | sed -e 's/width="1470" height="1250"/width="1024" height="768"/' > $TMPFILE
rm ~/Downloads/app.jnlp


javaws $TMPFILE

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Andrew Thompson
Solution 2 jpllosa
Solution 3 Antti Rytsölä

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