public void start(BundleContext ctx) throws Exception {
this.ctx = ctx;
init(ctx);
FilePluginTracker _filePluginTracker = new FilePluginTracker(ctx, FilePlugin.class.getName(), null);
_filePluginTracker.addFilePluginObserver(this);
filePluginTracker = _filePluginTracker;
filePluginTracker.open();
dataPluginTracker = new DataPluginTracker(ctx, DataPlugin.class.getName(), null);
dataPluginTracker.open();