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copied!<p>That's because "user.dir" indicates the current user directory in effect when the JVM is run; in Windows, this is often the location of the JAR unless you specify otherwise. In OSX there may well be no concept of a current dir, but more likely it just has a different default.</p> <p>Though I have never specifically tested this code under OSX, you can try this to locate the directory from which any class was loaded:</p> <pre><code>static public File getClassLocation(Class cls, boolean trmjar) { ClassLoader clsldr; // class loader URL urlobj; // url object String exturl; // external form of URL String lwrurl; // lowercase external form of URL File rtnfil; // return file if((clsldr=cls.getClassLoader())==null) { clsldr=ClassLoader.getSystemClassLoader(); } if((urlobj=clsldr.getResource(cls.getName().replace('.','/')+".class"))==null) { return null; } exturl=urlobj.toExternalForm(); lwrurl=exturl.toLowerCase(); while(lwrurl.startsWith("jar:") || lwrurl.startsWith("file:/")) { if(lwrurl.startsWith("jar:")) { if(lwrurl.indexOf("!/")!=-1) { exturl=exturl.substring(4,(exturl.indexOf("!/"))); } // strip encapsulating "jar:" and "!/..." from JAR url else { exturl=exturl.substring(4 ); } // strip encapsulating "jar:" } if(lwrurl.startsWith("file:/")) { exturl=exturl.substring(6); // strip encapsulating "file:/" if(!exturl.startsWith("/")) { exturl=("/"+exturl); } while(exturl.length()>1 && exturl.charAt(1)=='/') { exturl=exturl.substring(1); } } lwrurl=exturl.toLowerCase(); } exturl=java.net.URLDecoder.decode(exturl,"UTF-8"); rtnfil=new File(exturl); if(lwrurl.endsWith(".class") || (trmjar && lwrurl.endsWith(".jar"))) { rtnfil=rtnfil.getParentFile(); } if(rtnfil.exists()) { rtnfil=rtnfil.getAbsoluteFile(); } return rtnfil; } </code></pre> <p>it's worked reliably for me for years under Windows for all versions of Java since Java 1.</p>

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