Bug 33897 [Import/Export] Export to .tar.gz or .tar.bz2
Right click a Java project. Choose "Export...". A window opens where you can choose between different export targets. There is no ".tar.gz" target or ".tar.bz2". I would like to have either one (or both). If I must choose one, I prefer ".tar.bz2", but I don't really have a strong opinion about it; ".tar.gz" would be fine as well. The reason I somewhat prefer bzip2 is that bzip2 makes files noticably smaller than gzip, and my impression is that gzip is slowly being outcompeted. A Linux-GTK implementation would be good enough for me, but it is possible that "Unix All" would be a better platform as other Unix users could probably be interested in this as well.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardZipFileImportPage1.java
*	Answer a handle to the zip file currently specified as being the source.
     *	Return null if this file does not exist or is not of valid format.
     */
    protected ZipFile getSpecifiedSourceFile() {
        try {
            return new ZipFile(sourceNameField.getText());
        } catch (ZipException e) {
            displayErrorDialog(DataTransferMessages
                    .getString("ZipImport.badFormat")); 
        } catch (IOException e) {
            displayErrorDialog(DataTransferMessages
                    .getString("ZipImport.couldNotRead")); 
        }
        sourceNameField.setFocus();
        return null;
    }
    /**
     * Returns a structure provider for the specified zip file.
     */
    protected ZipFileStructureProvider getStructureProvider(ZipFile targetZip) {
        if (providerCache == null)
            providerCache = new ZipFileStructureProvider(targetZip);
        else if (!providerCache.getZipFile().getName().equals(
                targetZip.getName())) {
            clearProviderCache(); 
            providerCache = new ZipFileStructureProvider(targetZip);
        } else if (!providerCache.getZipFile().equals(targetZip))
            closeZipFile(targetZip); 
        return providerCache;
    }