public class PojoUpdateHandler {

	@Execute
	public void execute(final IProvisioningAgent agent, final Shell parent, final UISynchronize sync,
			final IWorkbench workbench) {
		// BioConstants.getRepository() simply returns the path to my repository - tried both, local directory and online on my webhost
		final String REPOSITORY_LOC = System.getProperty("UpdateHandler.Repo", BioConstants.getRepository());

		Job j = new Job("Update Job") {
			private boolean doInstall = false;

			@Override
			protected IStatus run(final IProgressMonitor monitor) {

				/* 1. Prepare update plumbing */

				final ProvisioningSession session = new ProvisioningSession(agent);
				final UpdateOperation operation = new UpdateOperation(session);

				// create uri - optional?
				URI uri = null;
				try {
					uri = new URI(REPOSITORY_LOC);
					System.out.println("Repository Location: " + uri);
				} catch (final URISyntaxException e) {
					sync.syncExec(new Runnable() {
						@Override
						public void run() {
							MessageDialog.openError(parent, "URI invalid", e.getMessage());
						}
					});
					return Status.CANCEL_STATUS;
				}
				// set location of artifact and metadata repo
				operation.getProvisioningContext().setArtifactRepositories(new URI[] { uri });
				operation.getProvisioningContext().setMetadataRepositories(new URI[] { uri });
				System.out.println("Searching for update @ " + REPOSITORY_LOC);
				// end of optional

				/* 2. check for updates */

				// run update checks causing I/O
				SubMonitor sub = SubMonitor.convert(monitor, "Checking for application updates...", 200);
				IStatus status = operation.resolveModal(sub.newChild(100));
				System.out.println("status -> " + status);

				// failed to find updates (inform user and exit)
				switch (status.getCode()) {
				case UpdateOperation.STATUS_NOTHING_TO_UPDATE:
					sync.syncExec(new Runnable() {
						@Override
						public void run() {
							MessageDialog.openWarning(parent, "No update", String.format(
									"No updates for the current installation have been found at '%s'", REPOSITORY_LOC));
						}
					});
					return Status.CANCEL_STATUS;

				default:
					/*
					 * 3. Ask if updates should be installed and run
					 * installation
					 */

					// found updates, ask user if to install?
					System.out.println("found updates -> ask user to install");
					if (status.isOK() && status.getSeverity() != IStatus.ERROR) {
						String updates = "";
						Update[] possibleUpdates = operation.getPossibleUpdates();
						for (Update update : possibleUpdates) {
							updates += update + "\n";
						}
						final String fUpdates = updates;
						sync.syncExec(new Runnable() {
							@Override
							public void run() {
								doInstall = MessageDialog.openQuestion(parent, "Really install these updates?",
										fUpdates);
							}
						});
					}
					break;
				}
				// start installation
				if (doInstall) {
					final ProvisioningJob provisioningJob = operation.getProvisioningJob(monitor);
					// updates cannot run from within Eclipse IDE!!!
					if (provisioningJob == null) {
						System.err.println("Running update from within Eclipse IDE? This won't work!!!");
						throw new NullPointerException();
					}

					// register a job change listener to track
					// installation progress and notify user upon success
					provisioningJob.addJobChangeListener(new JobChangeAdapter() {
						@Override
						public void done(IJobChangeEvent event) {
							if (event.getResult().isOK()) {
								sync.syncExec(new Runnable() {

									@Override
									public void run() {
										boolean restart = MessageDialog.openQuestion(parent,
												"Updates installed, restart?",
												"Updates have been installed successfully, do you want to restart?");
										if (restart) {
											workbench.restart();
										}
									}
								});

							}
							super.done(event);
						}
					});

					provisioningJob.schedule();
				}
				return Status.OK_STATUS;
			}
		};
		j.schedule();
	}
}

List<IInstallableUnit> installable = operation.getProvisioningContext().getExtraInstallableUnits();
				System.out.println("number of ExtraInstallable Units BEFORE/AFTER resolveModal "+installable.size());
				for (int i = 0; i < installable.size(); i++) {
					System.out.println(String.format("[%d] installable is ", i, installable.get(i).getId()));
					
				}

IMetadataRepositoryManager manager = (IMetadataRepositoryManager) agent.getService(IMetadataRepositoryManager.SERVICE_NAME);
repository = manager.loadRepository(uri, monitor);
IQueryResult<IInstallableUnit> units = repository.query(QueryUtil.createIUAnyQuery(), monitor);

BundleContext context = LumoCoreRuntimeActivator.getDefault().getBundle().getBundleContext();
Bundle[] bundles = context.getBundles();
for (int i = 0; i < bundles.length; i++) {
	System.out.println(bundles[i].getSymbolicName() + " - "+bundles[i].getVersion().toString());
}

Checking updates from the following repositories :
  + http://update.biooffice.at/p2/
UpdateStatus : No updates were found.

[binary]
[features]
[plugins]
artifacts.jar
content.jar

	final ProvisioningSession session = new ProvisioningSession(agent);
	final UpdateOperation operation = new UpdateOperation(session);

	/* 2. check for updates */

	final SubMonitor sub = SubMonitor.convert(monitor, "Checking for application updates...", 200);
	IMetadataRepositoryManager manager = (IMetadataRepositoryManager) agent.getService(IMetadataRepositoryManager.SERVICE_NAME);
	URI[] lstRepositories = manager.getKnownRepositories(IMetadataRepositoryManager.REPOSITORIES_ALL);
				
	StringBuilder repoListBuilder = new StringBuilder();
	if(lstRepositories != null && lstRepositories.length > 0){
		System.out.println("Checking updates from the following repositories :");
		for (URI anUri : lstRepositories) {
			System.out.println("  + "+anUri.toString());
			repoListBuilder.append("\t"+anUri.toString()+"\n");
		}
	}
	final String repositories = repoListBuilder.toString();
				
	//check if updates are available
	IStatus status = operation.resolveModal(sub.newChild(100));

			<plugin>
				<groupId>org.eclipse.tycho</groupId>
				<artifactId>target-platform-configuration</artifactId>
				<version>${tycho-version}</version>
				<configuration>
					<resolver>p2</resolver>
					<pomDependencies>consider</pomDependencies>
					<environments>
						<!-- environment> <os>linux</os> <ws>gtk</ws> <arch>x86</arch> </environment --> 
						<!-- environment> <os>linux</os> <ws>gtk</ws> <arch>x86_64</arch> </environment -->
						<environment> <os>win32</os> <ws>win32</ws>	<arch>x86</arch> </environment>
						<environment> <os>win32</os> <ws>win32</ws> <arch>x86_64</arch> </environment>
<!-- 						<environment> <os>macosx</os> <ws>cocoa</ws> <arch>x86_64</arch> </environment> -->
					</environments>
				</configuration>
			</plugin>