Sorry in advance for the long email. It is hard to be concise when you
don’t know what you are talking about…
My goal is to do basic scripting of a java swing GUI application, using
jruby with jemmy. I am a tester, and my knowledge of Java is limited
and I’m fairly green with ruby.
I played around with jruby, jemmy and the ‘swingset2’ demo app and that
seemed easy enough. Now I am trying to do something similar on a more
involved swing based app.
I have read some postings related to ‘classpath’ loading issue, but a
lot of this stuff is over my head. Here is my experiment… BTW, I am
on a Solaris platform using java 1.6.0_17 with jruby 1.5.1
I launched my GUI and looked at the java command arguments and options
used. I started my jruby with the same set of arguments. The
application classpath is very small, initially. The application is a
client/server application. The initial ‘jars’ are only to allow
communication between the client and server and determine if they have
the same version. If not, the client downloads a new set of jars (like
30 of them) and restart the application.
So it looks like the application is ‘adding’ jars during its execution
and I think that is causing some issue with jruby. The application
never launches successfully and reports a ‘nullPointerException’.
I managed to have partial source code of the app and connect a debugger
(via eclipse) [this is all new to me!] My script looks like
app = com.comp.app.Launch
My guess on what is going on…
ClassA is part of file1.jar. I think it is referred to a ‘singleton’
pattern… That instance is used at the beginning of the application
start. When I think the application is changing its class path, the
‘file1.jar’ is ‘re-added’ again. After that point, once the ‘classA’
instance is used, it returns null.
By trial an error, I manage the change some config file, so the
application removed the ‘file1.jar’ that is ‘added’ to the classpath.
That got me a bit further as I didn’t get the nullpointer in the same
location. I am not sure where it is failing after, as I am not seeing
any errors in the log, but also not seeing my GUI appear. I don’t think
my ‘config’ file change is a 'valid solution and I am just moving the
problem around so I thought someone might have an idea on things I could
I know it is hard to provide help with the limited information I can
provide, but thanks in advance for any suggestions…