From: Mike Calder <ceo@...>
Date: 2004-05-01T20:40:48+09:00
Subject: Class resolution problem

Please bear with me, I'm a beginner, and I'm beginning to think, of very 
little brain.  I'm trying to run a few of the standard samples and look at 
the code to learn Ruby.
Currently I'm on raabrowser.  I think I've loaded all the dependencies, but I 
get an error -

ruby raabrowser.rb
Loading devel/logger compatibility library...
/usr/local/lib/ruby/site_ruby/1.8/soap/streamHandler.rb:198:in `send_post': 
404: Not Found (SOAP::HTTPStreamError)
        from /usr/local/lib/ruby/site_ruby/1.8/soap/streamHandler.rb:93:in 
`send'
        from /usr/local/lib/ruby/site_ruby/1.8/soap/rpc/proxy.rb:108:in 
`invoke'
        from /usr/local/lib/ruby/site_ruby/1.8/soap/rpc/proxy.rb:117:in `call'
        from /usr/local/lib/ruby/site_ruby/1.8/soap/rpc/driver.rb:195:in 
`call'
        from (eval):2:in `getProductTree'
        from ./RAA.rb:23:in `__send__'
        from ./RAA.rb:23:in `method_missing'
        from raabrowser.rb:108:in `initialize'
        from raabrowser.rb:131:in `new'
        from raabrowser.rb:131

OK, I look at the stacktrace and follow the source code, it all makes sense 
down to StreamHandler.  

The code I have is in /usr/local/lib/ruby/site_ruby/1.8/soap/StreamHandler.rb:

line 93: send_post(conn_data, soapaction, charset)

ine 198:  raise HTTPStreamError.new("#{ res.status }: #{ res.reason }")

So presumably I have to find a class definition of HTTPStreamError.

A grep of /usr/local/lib/ruby/site_ruby/1.8/soap gives:

 grep "HTTPStreamError" *.rb
soap.rb:class HTTPStreamError < StreamError; end
soap.rb:class PostUnavailableError < HTTPStreamError; end
soap.rb:class MPostUnavailableError < HTTPStreamError; end
streamHandler.rb:      raise HTTPStreamError.new("#{ res.status }: 
#{ res.reason }")

so I look in soap.rb and find, sometime after a "module SOAP" declaration, so 
we're looking in the right place, the following code:

>> class Error < StandardError; end
>>
>> class StreamError < Error; end
>> class HTTPStreamError < StreamError; end
>> class PostUnavailableError < HTTPStreamError; end
>> class MPostUnavailableError < HTTPStreamError; end

which to my little brain includes a definition of the class we should be 
looking for (SOAP::HTTPStreamError) and basically equivalences it to 
StandardError (via SOAP::StreamError and SOAP::Error), which I presume is a 
core class, so I try that:

 ruby  -e 'class HTTPStreamHandler < StandardError; end; p HTTPStreamHandler'
HTTPStreamHandler

Yup, that works.

so, the problem must be that soap.rb is not being included or is otherwise 
failing?

But /usr/local/lib/ruby/site_ruby/1.8/soap/StreamHandler.rb has

>> require 'soap/soap'

which I presume points to /usr/local/lib/ruby/site_ruby/1.8/soap/soap.rb, and 
there is no Load Error message or other indication that soap.rb contains bad 
code.

What am I missing?


-- 
Clear skies!
Mike Calder.