Maven OSGi project compiles, but won't run

Question

I have been trying to port Paul Bakker's ( @paul-bakker ) Making JavaFX better with OSGi : javafx-osgi-example to a maven OSGi project that uses the Apache Felix Maven Bundle Plugin (BND). So far it compiles without any errors, but I can't get it to run:

Starting OSGi Framework
Found declarative services implementation: file:/C:/Users/Rev/.m2/repository/org/apache/felix/org.apache.felix.scr/1.6.2/org.apache.felix.scr-1.6.2.jar
INFO : org.apache.felix.scr (1):  Version = 1.6.2
Bundle: org.apache.felix.framework
    Registered service: [org.osgi.service.resolver.Resolver]
    Registered service: [org.osgi.service.packageadmin.PackageAdmin]
    Registered service: [org.osgi.service.startlevel.StartLevel]
Bundle: org.apache.felix.scr
    Registered service: [org.apache.felix.scr.ScrService]
    Registered service: [org.osgi.service.cm.ManagedService]
    Registered service: [org.apache.felix.scr.impl.ScrGogoCommand]
DEBUG: Starting ComponentActorThread
Bundle: null
Bundle: null
Bundle: null

As you can see, the bundles never get started. No errors are thrown. It just simply doesn't start.

Why won't the bundles start?

THE PROJECT SOURCES

1. Paul Bakker's (The original non-maven project) : javafx-osgi-example

2. My maven implementation of Paul Bakker's javafx-osgi-example : JavaFX-Maven-Multi-Module-OSGi

From the terminal (Windows), mvn clean install works perfectly.

UPDATE

I've been trying to run it from Eclipse, but to no success:

Run -> Run as -> Java Application

---

Eclipse Java EE IDE for Web Developers.

Version: Mars.2 Release (4.5.2)
Build id: 20160218-0600

---

UPDATE

I have a class App under dist in the package rev.dist that does the launching. It goes loops throug all the directories under the rev and starts any jars whose names match the names under resources/plugins.txt .

APP.java

package rev.dist;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.stream.Collectors;

import org.apache.commons.io.FilenameUtils;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.launch.Framework;
import org.osgi.framework.launch.FrameworkFactory;

public class App {

    FrameworkFactory frameworkFactory;
    private Framework framework;

    private List<String> pluginsList = new ArrayList<>();

    private int addedPlugins;

    public static void main(String[] args) throws BundleException, URISyntaxException {
        App app = new App();
        app.initialize();
    }

    private void initialize() throws BundleException, URISyntaxException {
        this.plugins();

        Map<String, String> map = new HashMap<String, String>();

        // make sure the cache is cleaned
        map.put(Constants.FRAMEWORK_STORAGE_CLEAN, Constants.FRAMEWORK_STORAGE_CLEAN_ONFIRSTINIT);

        map.put("ds.showtrace", "true");
        map.put("ds.showerrors", "true");

        frameworkFactory = ServiceLoader.load(FrameworkFactory.class).iterator().next();
        framework = frameworkFactory.newFramework(map);

        System.out.println("Starting OSGi Framework");
        framework.init();

        loadScrBundle(framework);

        File baseDir = new File("../");
        String baseDirPath = baseDir.getAbsolutePath();

        File[] files = new File(baseDirPath).listFiles();

        this.showFiles(files);

        for (Bundle bundle : framework.getBundleContext().getBundles()) {
            bundle.start();
            System.out.println("Bundle: " + bundle.getSymbolicName());
            if (bundle.getRegisteredServices() != null) {
                for (ServiceReference<?> serviceReference : bundle.getRegisteredServices())
                    System.out.println("\tRegistered service: " + serviceReference);
            }
        }
    }

    public void showFiles(File[] files) throws BundleException {

        if (addedPlugins != pluginsList.size()) {
            System.out.println(":: " + pluginsList.size());
            addedPlugins--;
        }

        for (File file : files) {
            if (file.isDirectory()) {
                // System.out.println("Directory: " + file.getName());
                showFiles(file.listFiles()); // Calls same method again.
            } else {
                String[] bits = file.getName().split(".");
                if (bits.length > 0 && bits[bits.length - 1].equalsIgnoreCase("jar")) {
                    // framework.getBundleContext().installBundle(file.toURI().toString());
                }

                // String ext = FilenameUtils.getExtension(file.getAbsolutePath());

                String basename = FilenameUtils.getBaseName(file.getName());

                if (pluginsList.contains(basename)) {
                    framework.getBundleContext().installBundle(file.toURI().toString());
                    System.out.println("File: " + file.getName());

                    System.out.println("Base >>>>>>>>>>>>> : " + basename);

                    pluginsList.remove(basename);
                }
            }
        }
    }

    public void plugins() {
        File plugins = new File("src/main/resources/plugins.txt");
        String fileName = plugins.getAbsolutePath();

        try (BufferedReader br = Files.newBufferedReader(Paths.get(fileName))) {

            // br returns as stream and convert it into a List
            pluginsList = br.lines().collect(Collectors.toList());

        } catch (IOException e) {
            e.printStackTrace();
        }

        pluginsList.forEach(System.out::println);
        addedPlugins = pluginsList.size();
    }

    private void loadScrBundle(Framework framework) throws URISyntaxException, BundleException {
        URL url = getClass().getClassLoader().getResource("org/apache/felix/scr/ScrService.class");
        if (url == null)
            throw new RuntimeException("Could not find the class org.apache.felix.scr.ScrService");
        String jarPath = url.toURI().getSchemeSpecificPart().replaceAll("!.*", "");
        System.out.println("Found declarative services implementation: " + jarPath);
        framework.getBundleContext().installBundle(jarPath).start();
    }
}

Answer 1

I have released a couple of first Early Access versions of Drombler FX - the modular application framework for JavaFX.

It's not based on Paul Bakker's work, but it's based on OSGi and Maven (POM-first), as well. Maybe you find it useful. The application framework is Open Source.

There is also a tutorial with a Getting Started page.