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Editorial Team
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Asked: 2026-06-09T21:57:16+00:00

I have written a Java application using Eclipse Juno on Fedora 17. I have

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I have written a Java application using Eclipse Juno on Fedora 17. I have JRE 1.7 installed, but I changed the Java build path to 1.6, I believe. Everything works fine there. I can then build a .jar file which runs on a Windows 7 virtual machine without problems. However, if I try to run it on the school computers (Windows 7
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing))

it gives an exception like: java.lang.IllegalArgumentException: cannot add to layout: constraint must be a string. This is apparently something to do with CardLayout, which I believe is a standard Swing component.

I am using miglayout library and sqlite-jdbc driver if that could be related.

I would really appreciate help with this

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1 Answer

  1. Editorial Team

    I found the problem.

    cardLayoutPanel is a JPanel
    cardLayout is obvious
    identifier is a String

    cardLayoutPanel.add(container);
cardLayout.addLayoutComponent(container, identifier);

    turns out that in Java 1.6 this doesn’t really work because it should actually be:

    cardLayoutPanel.add(container, identifier);

    without the second line
    Java 1.7 doesn’t complain for some reason. Weird.

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