Dependencies, dependencies - Selenium RC & NakedObjects

I wanted to throw together a simple demo of Fit and 'Selenium RC' working together… the way I'd do it.

I wanted the demo to be self-contained, not needing access to the internet to do the demo...

I'd heard about NakedObjects - a framework that requires that you only write domain objects and it generates the UI dynamically. Early versions just used Eclipse as a platform for the UI. Now (and for a while in fact) it also generates a web UI. Perfect! I could run the webserver locally and it could generate a simple UI - adequate for my needs and saving me a lot of hassle writing HTML and JSPs.

I started with a project that contained both NakedObjects and Selenium. Completed the NakedObjects Tutorial with a simple domain object (mine was a 'StaffMember' rather than a customer)… Took a look at the web front end and all was working well… it really was as easy as the tutorial video indicates...

As soon as I tried to run my SeleniumRC tests I started to get errors!!!

java.lang.VerifyError: (class: org/openqa/selenium/server/SeleniumServer, 
method: assembleHandlers signature: (Z)V) Incompatible argument to function

Eh!?!?! I'd run Selenium RC in this way plenty! Never seen this before... I opened another project I had some tests in… ran them - no problem… So, it had to be something about this project...

I googled and googled… couldn't find the answer. I saw one forum post (in Chinese - Google Translator helped me read it) that kept talking about Jetty… I realised that the jars for both selenium and NakedObjects contained Jetty - probably different versions… so, I played around with the class path order...

This is how it was initially, causing the VerifyError...

So, I moved NakedObjects to the bottom…

Now, my Selenium RC Tests passed:

But, now I was getting Log4J warnings...

log4j:WARN No appenders could be found for logger
 (org.openqa.selenium.server.SeleniumServer).
 log4j:WARN Please initialize the log4j system properly.

Grrr...

And then I realised that I hadn't restarted the NakedObjects server since changing the class path order project… Thought I ought to...

Boom!

Exception in thread "Client" java.lang.NoSuchMethodError: org.mortbay.jetty.Server.(I)V
at org.nakedobjects.nos.client.web.server.
NakedObjectsWebServer.init(NakedObjectsWebServer.java:32)
	at org.nakedobjects.nos.client.web.server.
NakedObjectsWebServer.init(NakedObjectsWebServer.java:28)
	at org.nakedobjects.nos.client.web.server.
WebBrowserClient.run(WebBrowserClient.java:43)
	at org.nakedobjects.nof.boot.system.NakedObjectsSystem.
runClient(NakedObjectsSystem.java:570)
	at org.nakedobjects.nof.boot.NakedObjects$1.
run(NakedObjects.java:252)
	at java.lang.Thread.run(Thread.java:595)

Clearly, the NakedObjects and Selenium both depended on different, incompatible versions of Jetty...

OK... That whole idea of quickly throwing a demo together was starting to be not so quick... I realised that I should have done what I would have normally done in practice...

Solution

At the moment, I don't need my Fit/Selenium Tests to be dependent upon anything in the application project (containing NakedObjects). The fact that they were all in one Eclipse project was just because I was being lazy - no, that's not fair - I was trying to just get a simple job done as quickly as possible... Well, more haste - less speed. So, what's the solution? Two separate projects - one with the Fit/Selenium tests and the other for the NakedObjects application, no interdependencies - job done!!!!