| Using ServletBridge with Tomcat 7 (Servlet 3.0) [message #1699544] |
Wed, 24 June 2015 23:35  |
 Jennifer Mising name
Messages: 6
Registered: July 2009 |
Junior Member |
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Hi,
I have a web application running in OSGi. I use the servlet bridge library (version 1.2) for deploying my application to Tomcat. I have been registering my servlets by contributing to the extension point org.eclipse.equinox.http.registry in my plugin and adding the following packages to manifest.mf:
Import-Package: javax.servlet,
javax.servlet.http
Things have been going perfect so far with this approach.
~~~~~
Now, I would like to make one of my servlets async-supported. I tried to do this by adding the following annotation to my servlet class:
@WebServlet(name = "OrderServlet", urlPatterns = {"/order"}, asyncSupported = true)
public class OrderServlet extends HttpServlet {
...
}
This requires javax.servlet.annotation to be added to the manifest:
Import-Package: javax.servlet,
javax.servlet.annotation,
javax.servlet.http
When I re-deploy my WAR with this change, my plugin fails to load. OSGi console shows the following error when I try to manually start the bundle:
id State Bundle
5 INSTALLED abc.asyncServlet_1.0.0
osgi> start 5
gogo: BundleException: The bundle "abc.asyncServlet_1.0.0 [5]" could not be resolved. Reason: Missing Constraint: Import-Package: javax.servlet.annotation; version="0.0.0"
osgi> diag 5
update@plugins/abc.asyncServlet_1.0.0.jar [5]
Direct constraints which are unresolved:
Missing imported package javax.servlet.annotation_0.0.0.
I am using Tomcat 7 and verified that the servlet-api.jar (version 3.0) in my tomcat/lib directory has the annotation package, so the problem does not seem to be related to my Tomcat.
I then try to drill down to the equinox-related plugins that I package with my WAR. I found that org.eclipse.equinox.servletbridge.FrameworkLauncher generates org.eclipse.equinox.servletbridge.extensionbundle_1.2.0 with the following package exports:
Export-Package: org.eclipse.equinox.servletbridge; version=1.1, javax.
servlet; version=3.0, javax.servlet.http; version=3.0, javax.servlet.
resources; version=3.0
So my guess is that it is the missing java.servlet.annotation in Export-Package that causes the problem.
I try to play around with the FrameworkLauncher code - get a newer version of servlet bridge (1.3), make some changes to the generateExtensionBundle() method in FrameworkLauncher, so that javax.servlet.annotation is included in Export-Package. My plugin is finally in RESOLVED state and all my servlets, including the one with asyncSupported=true, are working as before.
Am I correct that there is some issue with the servlet bridge I am using, or I am in a totally wrong direction?
Thanks for the help!!
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