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From "Ivan Dubrov (JIRA)" <j...@apache.org>
Subject [jira] Created: (AXIS2-4819) Race condition in WSDLDataLocator
Date Tue, 14 Sep 2010 11:01:35 GMT
Race condition in WSDLDataLocator
---------------------------------

                 Key: AXIS2-4819
                 URL: https://issues.apache.org/jira/browse/AXIS2-4819
             Project: Axis2
          Issue Type: Bug
          Components: wsdl
    Affects Versions: 1.4.1
            Reporter: Ivan Dubrov


Observable behaviour:

Sometimes WSDL request returns wrong WSDL. This occurs when multiple WSDL requests are made
at the same time.

The cause:

org.apache.axis2.dataretrieval.WSDLDataLocator is created only once and reused in a multiple
requests (see DataLocatorFactory, static method createDataLocator. The problem is that DataLocator
contains a state that is changed during the request, most importantly the field "theService".
It is possible that two concurrent WSDL request are processed at the same time and one request
overrides theService field set by other request. Consider the following scenario:

1. Both requests arrive (at the same time) at the line 129 (I assume version 1.4.1), which
read:
<pre>
axisService2WOM = new AxisService2WSDL11(theService);
</pre>
2. Both requests start executing the line (reading theService field).
3. Since WSDLDataLocator is shared between those two requests and theService is field of that
class, both requests will use same AxisService to generate WSDL. As a result, both requests
will output the same WSDL, which is obviously wrong.

I don't understand, why theService is made field after all? I think, it should be a local
variable instead.



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