Program: 35802
Project: 35802
Buggy source:
/** 
 * Retrieves a resource from the provider application and transforms it using the Renderer passed as a parameter.
 * @param relUrl the relative URL to the resource
 * @param request the request
 * @param response the response
 * @param renderers the renderers to use to transform the output
 * @throws IOException If an IOException occurs while writing to the response
 * @throws HttpErrorPage If the page contains incorrect tags
 */
public final void proxy(String relUrl,HttpServletRequest request,HttpServletResponse response,Renderer... renderers) throws IOException, HttpErrorPage {
  ResourceContext resourceContext=new ResourceContext(this,relUrl,null,request);
  request.setCharacterEncoding(config.getUriEncoding());
  resourceContext.setProxy(true);
  resourceContext.setPreserveHost(config.isPreserveHost());
  if (renderers.length == 0) {
    resourceContext.setNeededForTransformation(false);
    renderResource(resourceContext,new ResponseOutput(request,response));
  }
 else {
    TextOnlyStringOutput textOutput=new TextOnlyStringOutput(request,response);
    renderResource(resourceContext,textOutput);
    if (!textOutput.hasTextBuffer()) {
      LOG.debug("String_Node_Str" + relUrl + "String_Node_Str");
      return;
    }
    LOG.debug("String_Node_Str" + relUrl + "String_Node_Str");
    String currentValue=textOutput.toString();
    for (    Renderer renderer : renderers) {
      StringWriter stringWriter=new StringWriter();
      renderer.render(currentValue,stringWriter);
      currentValue=stringWriter.toString();
    }
    String charsetName=textOutput.getCharsetName();
    if (charsetName == null) {
      charsetName="String_Node_Str";
      response.getOutputStream().write(currentValue.getBytes(charsetName));
    }
 else {
      response.setCharacterEncoding(charsetName);
      response.getWriter().write(currentValue);
    }
  }
}

Fixed version (ground truth):
/** 
 * Retrieves a resource from the provider application and transforms it using the Renderer passed as a parameter.
 * @param relUrl the relative URL to the resource
 * @param request the request
 * @param response the response
 * @param renderers the renderers to use to transform the output
 * @throws IOException If an IOException occurs while writing to the response
 * @throws HttpErrorPage If the page contains incorrect tags
 */
public final void proxy(String relUrl,HttpServletRequest request,HttpServletResponse response,Renderer... renderers) throws IOException, HttpErrorPage {
  ResourceContext resourceContext=new ResourceContext(this,relUrl,null,request);
  request.setCharacterEncoding(config.getUriEncoding());
  resourceContext.setProxy(true);
  resourceContext.setPreserveHost(config.isPreserveHost());
  if (renderers.length == 0) {
    resourceContext.setNeededForTransformation(false);
    renderResource(resourceContext,new ResponseOutput(response));
  }
 else {
    TextOnlyStringOutput textOutput=new TextOnlyStringOutput(response);
    renderResource(resourceContext,textOutput);
    if (!textOutput.hasTextBuffer()) {
      LOG.debug("String_Node_Str" + relUrl + "String_Node_Str");
      return;
    }
    LOG.debug("String_Node_Str" + relUrl + "String_Node_Str");
    String currentValue=textOutput.toString();
    for (    Renderer renderer : renderers) {
      StringWriter stringWriter=new StringWriter();
      renderer.render(currentValue,stringWriter);
      currentValue=stringWriter.toString();
    }
    String charsetName=textOutput.getCharsetName();
    if (charsetName == null) {
      charsetName="String_Node_Str";
      response.getOutputStream().write(currentValue.getBytes(charsetName));
    }
 else {
      response.setCharacterEncoding(charsetName);
      response.getWriter().write(currentValue);
    }
  }
}