Create cross platform Java SWT Application

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I’ve just run into the same problem. I haven’t tried it yet, but I plan to include versions of swt.jar for all platforms and load the correct one dynamically in the start of the main method.

UPDATE: It worked. build.xml includes all jars:

<zipfileset dir="/home/aromanov/workspace/foo/lib" includes="swt_linux_gtk_x86.jar"/>
<zipfileset dir="/home/aromanov/workspace/foo/lib" includes="swt_macosx_x86.jar"/>
<zipfileset dir="/home/aromanov/workspace/foo/lib" includes="swt_win32_x86.jar"/>
<zipfileset dir="/home/aromanov/workspace/foo/lib" includes="swt_linux_gtk_x64.jar"/>
<zipfileset dir="/home/aromanov/workspace/foo/lib" includes="swt_macosx_x64.jar"/>
<zipfileset dir="/home/aromanov/workspace/foo/lib" includes="swt_win32_x64.jar"/>

and my main method starts with calling this:

private void loadSwtJar() {
    String osName = System.getProperty("os.name").toLowerCase();
    String osArch = System.getProperty("os.arch").toLowerCase();
    String swtFileNameOsPart = 
        osName.contains("win") ? "win32" :
        osName.contains("mac") ? "macosx" :
        osName.contains("linux") || osName.contains("nix") ? "linux_gtk" :
        ""; // throw new RuntimeException("Unknown OS name: "+osName)

    String swtFileNameArchPart = osArch.contains("64") ? "x64" : "x86";
    String swtFileName = "swt_"+swtFileNameOsPart+"_"+swtFileNameArchPart+".jar";

    try {
        URLClassLoader classLoader = (URLClassLoader) getClass().getClassLoader();
        Method addUrlMethod = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
        addUrlMethod.setAccessible(true);

        URL swtFileUrl = new URL("rsrc:"+swtFileName); // I am using Jar-in-Jar class loader which understands this URL; adjust accordingly if you don't
        addUrlMethod.invoke(classLoader, swtFileUrl);
    }
    catch(Exception e) {
        throw new RuntimeException("Unable to add the SWT jar to the class path: "+swtFileName, e);
    }
}

[EDIT] For those looking for the “jar-in-jar classloader”: It’s included in Eclipse’s JDT (the Java IDE built on Eclipse). Open org.eclipse.jdt.ui_*version_number*.jar with an archiver and you will find a file jar-in-jar-loader.zip inside.

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