Program: 28798
Project: 28798
Buggy source:
void service(ServletRequest request,ServletResponse response,Servlet serv) throws IOException, ServletException {
  InstanceSupport supp=getInstanceSupport();
  try {
    supp.fireInstanceEvent(BEFORE_SERVICE_EVENT,serv,request,response);
    if (!isAsyncSupported()) {
      RequestFacadeHelper reqFacHelper=RequestFacadeHelper.getInstance(request);
      if (reqFacHelper != null) {
        reqFacHelper.disableAsyncSupport();
      }
    }
    if ((request instanceof HttpServletRequest) && (response instanceof HttpServletResponse)) {
      if (SecurityUtil.executeUnderSubjectDoAs()) {
        final ServletRequest req=request;
        final ServletResponse res=response;
        Principal principal=((HttpServletRequest)req).getUserPrincipal();
        Object[] serviceType=new Object[2];
        serviceType[0]=req;
        serviceType[1]=res;
        SecurityUtil.doAsPrivilege("String_Node_Str",serv,classTypeUsedInService,serviceType,principal);
      }
 else {
        serv.service((HttpServletRequest)request,(HttpServletResponse)response);
      }
    }
 else {
      serv.service(request,response);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response);
  }
 catch (  IOException e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  ServletException e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  RuntimeException e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  Error e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  Throwable e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw new ServletException(rb.getString(SERVLET_EXECUTION_EXCEPTION),e);
  }
}

Fixed version (ground truth):
void service(ServletRequest request,ServletResponse response,Servlet serv) throws IOException, ServletException {
  InstanceSupport supp=getInstanceSupport();
  try {
    supp.fireInstanceEvent(BEFORE_SERVICE_EVENT,serv,request,response);
    if (!isAsyncSupported()) {
      RequestFacadeHelper reqFacHelper=RequestFacadeHelper.getInstance(request);
      if (reqFacHelper != null) {
        reqFacHelper.disableAsyncSupport();
      }
    }
    if ((request instanceof HttpServletRequest) && (response instanceof HttpServletResponse)) {
      if (SecurityUtil.executeUnderSubjectDoAs()) {
        final ServletRequest req=request;
        final ServletResponse res=response;
        Principal principal=((HttpServletRequest)req).getUserPrincipal();
        Object[] serviceType=new Object[2];
        serviceType[0]=req;
        serviceType[1]=res;
        SecurityUtil.doAsPrivilege("String_Node_Str",serv,classTypeUsedInService,serviceType,principal);
      }
 else {
        serv.service((HttpServletRequest)request,(HttpServletResponse)response);
      }
    }
 else {
      serv.service(request,response);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response);
  }
 catch (  IOException e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  ServletException e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  RuntimeException e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  Error e) {
    if (response instanceof HttpServletResponse) {
      ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw e;
  }
catch (  Throwable e) {
    ((HttpServletResponse)response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    supp.fireInstanceEvent(AFTER_SERVICE_EVENT,serv,request,response,e);
    throw new ServletException(rb.getString(SERVLET_EXECUTION_EXCEPTION),e);
  }
}