Bug 51895 Error when recovering javadoc archive path for a jar
1. add swt.jar to the Java build path of a project 2. open the properties dialog for this jar from the package explorer 3. change the javadoc location to : [x] javadoc in archive archive path: <path_to_eclipse>/plugins/org.eclipse.platform/doc/isv/doc.zip (in my case '/home/luc/host/eclipse/plugins/org.eclipse.platform/doc/isv/doc.zip') path within archive: reference/api 4. close the properties dialog 5. reopen the properties dialog The leading slash is missing, the dialog display the error 'the archive is missing '
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavadocConfigurationBlock.java
fURLResult= null;
		try {
			String jdocLocation= fURLField.getText();
			if (jdocLocation.length() == 0) {
				return status;
			}
			if (jdocLocation.length() > 0) {
				URL url= new URL(jdocLocation);
				if ("file".equals(url.getProtocol())) { 
					if (url.getFile() == null) {
						status.setError(PreferencesMessages.getString("JavadocConfigurationBlock.error.notafolder")); 
						return status;
					} else {
						File dir= new File(url.getFile());
						if (!dir.isDirectory()) {
							status.setError(PreferencesMessages.getString("JavadocConfigurationBlock.error.notafolder")); 
							return status;
						}
						File packagesFile= new File(dir, "package-list"); 
						if (!packagesFile.exists()) {
							status.setWarning(PreferencesMessages.getString("JavadocConfigurationBlock.warning.packagelistnotfound")); 
							
						}						
					}
				}
				fURLResult= url;
			} 
		} catch (MalformedURLException e) {
			status.setError(PreferencesMessages.getString("JavadocConfigurationBlock.MalformedURL.error"));  
			return status;