Exibir imagem no browser

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


		String query = "select IMG.CONTENT from VEP_CNJ_TB_DOCUMENTO_IMAGEM IMG WHERE IMG.ID_DOCUMENTOIMAGEM = ?";
		String id = request.getParameter("id");
		try {
			con = Pilha.getConexao();
			PreparedStatement stmt = con.prepareStatement(query);
			stmt.setString(1, id);
			OracleResultSet rset = (OracleResultSet) stmt.executeQuery(); //LANÇANDO EXCEÇÃO
			if (rset.next()) {
				OrdImage img = (OrdImage) rset.getORAData(1, OrdImage.getORADataFactory());
				OrdHttpResponseHandler handler = new OrdHttpResponseHandler(request, response);
				handler.sendImage(img);
			} else {
				response.setStatus(response.SC_NOT_FOUND);
			}
			rset.close();
			stmt.close();
			con.close();
		} catch (Exception e) {
			e.printStackTrace();
	        System.out.println("Erro foto:"+e.getMessage());
	        PrintWriter out;
	        out = response.getWriter();
	        response.setContentType( "text/html" );
	        out.println(fotoNaoCadastrada);       
	        out.close();
		} finally {
			// freeConnection( conn );
		}
		response.setContentType("text/html;charset=UTF-8");
	    PrintWriter out = response.getWriter();

	}

java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.DelegatingResultSet
	
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Unknown Source)
Erro foto:org.apache.tomcat.dbcp.dbcp.DelegatingResultSet