Stack overflow when processing XSD with mutual recursion
--------------------------------------------------------

         Key: AXIS2-359
         URL: http://issues.apache.org/jira/browse/AXIS2-359
     Project: Apache Axis 2.0 (Axis2)
        Type: Bug
  Components: wsdl  
    Versions: 0.9, 0.91, 0.92, 0.93    
 Environment: Win2K, Java  1.4.2_08-b03, Axis2 0.91, Axis2 0.93
    Reporter: Kevin J. Winters


The recursive method WSDLPump.pushSchemaElement(...) does not protect against 
schemas with mutual recursion.  A check of already processed namespaces could 
be used to prevent the stack overflow in a manner similar to:

   ...
/** begin mod **/
    private HashSet schemaCache = new HashSet();
/**  end mod  **/
   
    private void pushSchemaElement(Schema originalSchema,Stack stack){
        if (originalSchema==null){
            return;
        }
   
/** begin mod **/
        if ( schemaCache.contains(originalSchema.getDocumentBaseURI())) {
            return;
        } else {
            schemaCache.add(originalSchema.getDocumentBaseURI());
        }
/**  end mod  **/

        stack.push(originalSchema);
        ...

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