Wednesday, 6 December 2017

WebSphere Liberty Profile - Snooping About

I've written about the SuperSnoop Servlet before: -

and it's one tool that I use, and reuse, whenever I'm testing a build of WebSphere Application Server etc.

However, it niggled me that, whilst it DOES run on WebSphere Liberty Profile, it doesn't actually work.

Having deployed it: -

cp SuperSnoopWeb.war /opt/ibm/WebSphere/Liberty/usr/servers/defaultServer/dropins/

( I *SO* love the Dropin support on WLP )

and watched the logs: -

[AUDIT   ] CWWKT0016I: Web application available (default_host): http://mfp.uk.ibm.com:9080/SuperSnoopWeb/
[AUDIT   ] CWWKZ0001I: Application SuperSnoopWeb started in 0.085 seconds.

I see this: -


when I hit it, and this in the logs: -

SuperSnoop running
[ERROR   ] SRVE0777E: Exception thrown by application class 'SuperSnoop.getAppServerName:46'
java.lang.NoClassDefFoundError: com/ibm/websphere/management/AdminServiceFactory
        at SuperSnoop.getAppServerName(SuperSnoop.java:46)
        at SuperSnoop.doGet(SuperSnoop.java:160)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1255)
        at [internal classes]

This developerWorks Answer thread covered the specific issue - that of the AdminServiceFactory class not being available to me: -


…
The full profile AdminService API is not provided in the Liberty profile as it relates to an administration model that is not provided, nor compatible with the Liberty profile.
…

but also said this: -

…
Have you tried using the liberty migration tool (tech preview) to scan your application? If so this may be a package we are missing from the list. If you haven't tried it, there are more details on the tool here; you may find it useful: https://www.ibmdw.net/wasdev/2014/04/23/websphere-application-server-migration-toolkit-liberty-tech-preview/
…

Taking this good advice, I downloaded the Migration Toolkit for Application Binaries: -


and ran it: -

java -jar binaryAppScanner.jar SuperSnoopWeb.war

Processing the SuperSnoopWeb.war application.
Scanning files.........
The report was saved to the following file: /Users/davidhay/Downloads/wamt/SuperSnoopWeb.war_MigrationReport.html

The resulting HTML document said, in part: -


*BUT*




which is good intel.

So I'll continue to deploy it, in part to test my deployment practices, but won't expect it to do owt :-(

However, one of my blog correspondents, Jeremy Hughes from IBM, did rightly point out that there's a more recent Github project called Ferret: -

A sample servlet application which responds to HTTP requests with information about the request and server


which doesn't have the same drawback re unavailable APIs: -



etc.

and also runs happily on Liberty: -




at

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