[jira] Created: (AXIS2-4819) Race condition in WSDLDataLocator

["Ivan Dubrov (JIRA)" <ji...@apache.org>]

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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