Using HttpClient = Error importing OSGI bundle from Eclispe

[Former Community Member]

Hi Everyone,

I hope someone can help.

Im trying to import a servlet into CQ via maven and getting an error which I dont understand.  My servlet is using HttpClient to call a third party api. 

When I import via maven I get the following error

16.09.2013 12:36:08.210 *ERROR* [OsgiInstallerImpl] org.apache.sling.servlets.resolver.internal.SlingServletResolver bindServlet: Servlet service not available from reference [javax.servlet.Servlet, javax.servlet.ServletConfig, java.io.Serializable]

Here is my code

@Component(immediate = true, metatype = false, description = "Darren Test") @Service @Properties({ @Property(name = "sling.servlet.paths", value = "/bin/darrentest") }) /** * How to send a request via proxy using {@link HttpClient}. * * @since 4.0 */ public class DarrenTest extends SlingSafeMethodsServlet { /** * */ private static final long serialVersionUID = 1L; private final int connectionTimeoutMillis = 5000; private final int socketTimeoutMillis = 5000; protected final void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response) throws ServletException, IOException { HttpClient httpClient = new DefaultHttpClient(); HttpParams httpParams = httpClient.getParams(); httpParams.setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3,false)); HttpConnectionParams.setConnectionTimeout(httpParams, connectionTimeoutMillis); HttpConnectionParams.setSoTimeout(httpParams, socketTimeoutMillis);

Can anyone help me unsertand what is going on here?

[smacdonald2008]

We have a community article that discusses how to successfully create a sling Servlet for AEM. In your code -- i am not seeing this annotation: 
@SlingServlet

See this community article: 

http://scottsdigitalcommunity.blogspot.ca/2013/06/posting-form-data-to-adobe-cq-using.html

In this article -- the OSGi bundle is deployed manually; however, in this article, we use a Maven plugin to automatically deploy the OSGi bundle:

http://scottsdigitalcommunity.blogspot.ca/2013/03/creating-adobe-cq-shopping-cart.html

Build the servlet as shown in article 1 and then you can use the Maven plugin shown in the 2nd article to deploy via Maven (or you can deploy manually).

Hope this helps you.

[Former Community Member]

Hi,

Thanks for the post..

I believe the I made a mistake with the pasting of my code as I had to remove some client specific stuff... And must of removed the annotation by mistake

Ive created a small test bundle

package osgi.test;

import java.io.IOException;

import javax.servlet.ServletException;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;

@SlingServlet(paths = "/bin/test", methods = "GET")
public class ApiServletTwo extends SlingSafeMethodsServlet {

    private static final long serialVersionUID = -3960692666512058118L;
    
    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response)  throws ServletException, IOException {
        
        HttpClient httpClient = new DefaultHttpClient();
        HttpParams httpParams = httpClient.getParams();
        httpParams.setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3,false));
//        HttpConnectionParams.setConnectionTimeout(httpParams, 200);
//        HttpConnectionParams.setSoTimeout(httpParams, 200);
    
    }
     
}

If I comment out the httpParams the bundle is fine, but as it stands I get

16.09.2013 14:32:52.708 *ERROR* [OsgiInstallerImpl] org.apache.sling.servlets.resolver.internal.SlingServletResolver bindServlet: Servlet service not available from reference [javax.servlet.Servlet, javax.servlet.ServletConfig, java.io.Serializable] 16.09.2013 14:32:52.711 *ERROR* [OsgiInstallerImpl] org.apache.sling.servlets.resolver.internal.SlingServletResolver bindServlet: Servlet service not available from reference [javax.servlet.Servlet]

Is there a conflict of some sort?

[smacdonald2008]

It looks that way -- i am going to try building an OSGi bundle with this code and see if i can duplicate your results. 

[smacdonald2008 · Accepted solution]

I have discovered your issue. Look at this illustration:

[img]TestSer33.png[/img]

It means that there is missing dependencies within AEM. You need to include these JAR files within a bundle fragment:

• httpclient-4.3
• httpcore-4.3

Once you get these into a bundle fragment and deployed -- you will be able to start your bundle that contains the sling servlet. To learn how to create a bundle fragment, see the first link above. We placed a JSON JAR into a bundle fragment. 

HTH