I'd like to use declarative service feature in my OSGI project for my servlets. In details: user is able to install module manually on the main application selecting some *.jar file, main application has embedded OSGI server and when the OSGI module is activated it should be registered for some requests
For example in this way:
protected void startup() {
MyServlet servlet = new MyServlet();
if (httpService != null) {
httpService.registerServlet("/req", servlet, null, null); **//OK!**
}
}
Unfortunately, I can't have httpService instance initialized and that's the problem. Here's the problem servlet module code listing:
@Component(name="app", immediate=true)
@Service(value=App.class)
public class App {
@Reference(name = "httpService", referenceInterface = HttpService.class, bind = "bindHttpService", unbind = "unbindHttpService")
private HttpService httpService;
@Activate
protected void startup() {
MyServlet servlet = new MyServlet();
if (httpService != null) {
httpService.registerServlet("/req", servlet, null, null);
//OK!
} else {
//Not OK!
}
}
protected void bindHttpService(HttpService httpService) {
this.httpService = httpService;
}
protected void unbindHttpService(HttpService httpService) {
this.httpService = null;
}
// some more code.........
}
Maven bundle plugin settings pom.xml code
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>app</Bundle-SymbolicName>
<Embed-Dependency>!org.osgi.core</Embed-Dependency>
<Embed-Transitive>true</Embed-Transitive>
<Import-Package>
<![CDATA[
org.osgi*,
com.mynamespace
]]>
</Import-Package>
</instructions>
</configuration>
</plugin>
And here is simplified code for embedded OSGI server on main application:
public static void main(String[] args)
{
FrameworkFactory frameworkFactory = ServiceLoader.load(FrameworkFactory.class).iterator().next();
Map<String, String> config = new HashMap<String, String>();
config.put(Constants.FRAMEWORK_STORAGE_CLEAN, "onFirstInit");
config.put(Constants.FRAMEWORK_SYSTEMPACKAGES_EXTRA, "javax.microedition.io");
Framework framework = frameworkFactory.newFramework(config);
framework.start();
BundleContext context = framework.getBundleContext();
List<Bundle> installedBundles = new LinkedList<Bundle>();
// install prerequisites
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.util_1.0.500.v20130404-1337.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.osgi.services_3.4.0.v20131120-1328.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.ds_1.4.200.v20131126-2331.jar"));
//install servlet module
installedBundles.add(context.installBundle("file:///MY_PATH\\app.jar"));
for (Bundle bundle : installedBundles) {
bundle.start();
}
}
I was inspired by example from Peter Fries blog (http://www.peterfriese.de/osgi-servlets-flexibility-by-simplicity/), but I can't have httpService instance initialized.
The App module even could be started only if @Reference annotation is removed or covered with comment, in other case module will not be activated.
I suspect that my embedded OSGI doesn't have some required module but can't get the details about it - log console doens't say anything.
UPDATE
Thanks for the hint Balasz!
There are my mistakes:
0. When <Embed-Dependency>!org.osgi.core</Embed-Dependency> is declared httpService can't be automatically binded through @Reference annotatoin, so bind = "bindHttpService", unbind = "unbindHttpService" is useless. I removed <Embed-Dependency> declaration and it helps to bind httpService like I want to have it (via bindHttpService).
Before installing bundles on OSGI server jetty settings should be specified:
System.setProperty("jetty.port","8080");
System.setProperty("jetty.home.bundle", "org.eclipse.jetty.osgi.boot");
There are too many jars must be installed on embedded OSGI server, in my case
// Mandatory bundles installedBundles.add(context.installBundle("file:///MY_PATH\org.eclipse.equinox.util_1.0.500.v20130404-1337.jar")); installedBundles.add(context.installBundle("file:///MY_PATH\org.eclipse.equinox.ds_1.4.200.v20131126-2331.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\org.eclipse.osgi.services_3.4.0.v20131120-1328.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\javax.servlet-api-3.0.1.jar"));
// Container bundles
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.security_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.servlet_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.continuation_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.server_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.util_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.io_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.jetty.http_8.1.12.v20130726.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.http.servlet_1.1.400.v20130418-1354.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.http.jetty_3.0.200.v20131021-1843.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.http.servletbridge_1.0.300.v20130327-1442.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.servletbridge_1.3.0.v20130927-1541.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.common_3.6.200.v20130402-1505.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.registry_3.5.400.v20130717-1325.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.eclipse.equinox.http.registry_1.1.300.v20130402-1529.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\org.osgi.service.obr-1.0.2.jar"));
// Service bundles
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-httpservice-8.0.4.v20111024.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\ow2-httpservice-1.2-spec-1.0.0.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-osgi-boot-8.0.4.v20111024.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-deploy-8.0.4.v20111024.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-webapp-8.0.4.v20111024.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-security-8.0.4.v20111024.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-http-8.0.4.v20111024.jar"));
installedBundles.add(context.installBundle("file:///MY_PATH\\jetty-xml-8.0.4.v20111024.jar"));
// Finally, required OSGI bundle
installedBundles.add(context.installBundle("file:///MY_PATH\\app.jar"));
So with these changes I have an initialized httpService object, and now I want to register my servlet instance
@Activate
protected void startup() {
MyServlet servlet = new MyServlet();
if (httpService != null) {
System.out.println("Greetings! I just want to be sure that service isn't null!")
//httpService.registerServlet("/req", servlet, null, null); // BAD PLACE
} else {
System.out.println("Something goes wrong")
}
}
The code snippet above will show the 'Greetings' message but if I try to register servlet and uncomment 'BAD PLACE' the mesage won't be shown, nothing is happening. Exception is also couldn't be catched; looks like the 'startup' method is ignored. Any ideas what's wrong?
https://stackoverflow.com/questions/23290506
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