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    <p>I have a working implementation which is now referenced from the <a href="http://www.eclipse.org/swt/faq.php#multiplatformjar">SWT FAQ</a>.</p> <p>This approach is now available to use as an ANT task: <a href="http://mchr3k.github.com/swtjar/">SWTJar</a></p> <p>[EDIT] SWTJar has now been updated to use Alexey Romanov's solution as described above.</p> <p><a href="https://github.com/mchr3k/org.intrace/blob/master/org.intrace/build.xml">build.xml</a></p> <p>First I build a jar containing all of my application classes.</p> <pre><code>&lt;!-- UI (Stage 1) --&gt; &lt;jarjar jarfile="./build/tmp/intrace-ui-wrapper.jar"&gt; &lt;fileset dir="./build/classes" includes="**/shared/*.class" /&gt; &lt;fileset dir="./build/classes" includes="**/client/gui/**/*.class" /&gt; &lt;zipfileset excludes="META-INF/*.MF" src="lib/miglayout-3.7.3.1-swt.jar"/&gt; &lt;/jarjar&gt; </code></pre> <p>Next, I build a jar to contain all of the following:</p> <ul> <li>JARs <ul> <li>The jar which I just built</li> <li>All the SWT jars</li> </ul></li> <li>Classes <ul> <li>The "Jar-In-Jar" classloader classes</li> <li>A special loader class - see below</li> </ul></li> </ul> <p>Here is the fragment from build.xml.</p> <pre><code>&lt;!-- UI (Stage 2) --&gt; &lt;jarjar jarfile="./build/jars/intrace-ui.jar"&gt; &lt;manifest&gt; &lt;attribute name="Main-Class" value="org.intrace.client.loader.TraceClientLoader" /&gt; &lt;attribute name="Class-Path" value="." /&gt; &lt;/manifest&gt; &lt;fileset dir="./build/classes" includes="**/client/loader/*.class" /&gt; &lt;fileset dir="./build/tmp" includes="intrace-ui-wrapper.jar" /&gt; &lt;fileset dir="./lib" includes="swt-*.jar" /&gt; &lt;zipfileset excludes="META-INF/*.MF" src="lib/jar-in-jar-loader.jar"/&gt; &lt;/jarjar&gt; </code></pre> <p><a href="https://github.com/mchr3k/org.intrace/blob/master/org.intrace/src/org/intrace/client/loader/TraceClientLoader.java">TraceClientLoader.java</a></p> <p>This loader class uses the jar-in-jar-loader to create a ClassLoader which loads classes from two jars.</p> <ul> <li>The correct SWT jar</li> <li>The application wrapper jar</li> </ul> <p>Once we have this classloader we can launch the actual application main method using reflection.</p> <pre><code>public class TraceClientLoader { public static void main(String[] args) throws Throwable { ClassLoader cl = getSWTClassloader(); Thread.currentThread().setContextClassLoader(cl); try { try { System.err.println("Launching InTrace UI ..."); Class&lt;?&gt; c = Class.forName("org.intrace.client.gui.TraceClient", true, cl); Method main = c.getMethod("main", new Class[]{args.getClass()}); main.invoke((Object)null, new Object[]{args}); } catch (InvocationTargetException ex) { if (ex.getCause() instanceof UnsatisfiedLinkError) { System.err.println("Launch failed: (UnsatisfiedLinkError)"); String arch = getArch(); if ("32".equals(arch)) { System.err.println("Try adding '-d64' to your command line arguments"); } else if ("64".equals(arch)) { System.err.println("Try adding '-d32' to your command line arguments"); } } else { throw ex; } } } catch (ClassNotFoundException ex) { System.err.println("Launch failed: Failed to find main class - org.intrace.client.gui.TraceClient"); } catch (NoSuchMethodException ex) { System.err.println("Launch failed: Failed to find main method"); } catch (InvocationTargetException ex) { Throwable th = ex.getCause(); if ((th.getMessage() != null) &amp;&amp; th.getMessage().toLowerCase().contains("invalid thread access")) { System.err.println("Launch failed: (SWTException: Invalid thread access)"); System.err.println("Try adding '-XstartOnFirstThread' to your command line arguments"); } else { throw th; } } } private static ClassLoader getSWTClassloader() { ClassLoader parent = TraceClientLoader.class.getClassLoader(); URL.setURLStreamHandlerFactory(new RsrcURLStreamHandlerFactory(parent)); String swtFileName = getSwtJarName(); try { URL intraceFileUrl = new URL("rsrc:intrace-ui-wrapper.jar"); URL swtFileUrl = new URL("rsrc:" + swtFileName); System.err.println("Using SWT Jar: " + swtFileName); ClassLoader cl = new URLClassLoader(new URL[] {intraceFileUrl, swtFileUrl}, parent); try { // Check we can now load the SWT class Class.forName("org.eclipse.swt.widgets.Layout", true, cl); } catch (ClassNotFoundException exx) { System.err.println("Launch failed: Failed to load SWT class from jar: " + swtFileName); throw new RuntimeException(exx); } return cl; } catch (MalformedURLException exx) { throw new RuntimeException(exx); } } private static String getSwtJarName() { // Detect OS String osName = System.getProperty("os.name").toLowerCase(); String swtFileNameOsPart = osName.contains("win") ? "win" : osName .contains("mac") ? "osx" : osName.contains("linux") || osName.contains("nix") ? "linux" : ""; if ("".equals(swtFileNameOsPart)) { throw new RuntimeException("Launch failed: Unknown OS name: " + osName); } // Detect 32bit vs 64 bit String swtFileNameArchPart = getArch(); String swtFileName = "swt-" + swtFileNameOsPart + swtFileNameArchPart + "-3.6.2.jar"; return swtFileName; } private static String getArch() { // Detect 32bit vs 64 bit String jvmArch = System.getProperty("os.arch").toLowerCase(); String arch = (jvmArch.contains("64") ? "64" : "32"); return arch; } } </code></pre> <p>[EDIT] As stated above, 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. I renamed this to jar-in-jar-loader.jar.</p> <p><a href="https://github.com/downloads/mchr3k/org.intrace/intrace-ui.jar">intrace-ui.jar</a> - this is the jar which I built using the process described above. You should be able to run this single jar on any of win32/64, linux32/64 and osx32/64.</p> <p>[EDIT] This answer is now referenced from the <a href="http://www.eclipse.org/swt/faq.php#multiplatformjar">SWT FAQ</a>.</p>
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    1. POCreate cross platform Java SWT Application
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    1. COI couldn't find a way to contact you on your website, but I cannot get your swtjar task to work. I get the error `D:\My Dropbox\Java\kEllyIRClient\swtjar-build.xml:16: The archive swtjar.jar doesn't exist`. The taskdef has the right classpath path, because if you change it, it complains about that. I have no clue how to get this to work, and I'd much rather do it using your task, than manually implement the reflection stuff.
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      1. USRahat Ahmed
    2. COCan you post a link to your complete build.xml (or at least the target which you are having problem with?). Can you also give me details about the layout of your files/folders on disk? Let me know your email address and I will try and help you directly.
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    3. COThis is the question that I posted: http://stackoverflow.com/questions/9107509/unable-to-make-ant-script-with-swtjar/9112334#comment11467319_9112334 but the script has changed since then. My email is rahatarmanahmed@gmail.com
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