How to invoke another OSGI bundle servlet from different OSGI bundle?

Servlets are registered services in OSGi so you can access it just like a service. If you have shared logic, its probably better to move that code into a class you can define as an OSGi service.

IN CQ 5.6 - you have access to this API:

Package org.apache.commons.httpclient

Here is this API showing up the AEM Dependency Finder:

[img]cleinthttp.png[/img]

So you can code a custom service in the OSGi that can use an object of type org.apache.commons.httpclient.HttpClient to send an HTTP request to an AEM Sling Servlet.  

Also - here is the Maven dependency you need:

<dependency>
    <groupId>com.day.commons.osgi.wrapper</groupId>
    <artifactId>com.day.commons.osgi.wrapper.commons-httpclient</artifactId>
    <version>3.1.0.018</version>
    <scope>provided</scope>
</dependency>

If you want to invoke an AEM servlet from another OSGi within the same AEM instance (as opposed to using Service injection), you can use Java org.apache.http.client.methods API. See:

http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/methods/package-summary.html

Hi scott,

Thanks for your comments. and the question is if AEM support third party httpclient.jar dependency well?

Thanks a lot.

Best regards,

Brian

hi scott,

i did it following your suggestion. However, maven can't download the jar com.day.commons.osgi.wrapper.commons-httpclient-3.1.0.018.jar

i don't know how to deal with it.  Details please see below screenshot.

[img]httpclient.png[/img]

Thanks a lot.

What you do is inject service A (defined in bundle X) into service B (defined in bundle Z). If you are not familiar with how to perform dependency injection - see this article:

 Injecting a DataSourcePool Service into an Adobe Experience Manager OSGi bundle

To get the aem http client api to work with maven, you have to add the following elements to your POM file. This pulls from the adobe repos

<repositories>
    <repository>
    <id>adobe</id>
    <name>Adobe Public Repository</name>
    <url>http://repo.adobe.com/nexus/content/groups/public/</url>
    <layout>default</layout>
    </repository>
    </repositories>
    <pluginRepositories>
    <pluginRepository>
    <id>adobe</id>
    <name>Adobe Public Repository</name>
    <url>http://repo.adobe.com/nexus/content/groups/public/</url>
    <layout>default</layout>
    </pluginRepository>
</pluginRepositories>

Hi Scott,

After add that elements to my POM file, it happened the error either as before.

[img]httpclient.png[/img]

So weird here.

Best regards,

Brian

I will have a community article that shows you HOW TO use org.apache.commons.httpclient APIS in AEM - including how to build the OSGi and how to use it to invoke a Sling Servlet within AEM. This will be posted sometime in the next day.