java filter excepion handling

Tole je v filtru, skozi filter gre en .jsp
1. Ne gre v exception
2. strOut = HTML, ki pa iz nekega razloga ni celoten
3. Isti .jsp brez filtra, vse dela OK - HTML = celoten.
4. Ničesar v server logih.
5. Se pravi nekaj mora iti narobe ? znotraj naslednjega try/except. Morda pa ne ujamem vseh exceptionov ?

  GenericResponseWrapper wrappedResponse = null;  
  byte[] bytes = null;
  try
  {   
  OutputStream out = response.getOutputStream();
  wrappedResponse = new GenericResponseWrapper((HttpServletResponse) response); 
  chain.doFilter(request,wrappedResponse);//throws IOException, ServletException
  bytes = wrappedResponse.getData();
  }
  catch (Exception ex)
  {
    ...
  }
  String strOut = new String(bytes);

Copy/paste coda z neta, oracle kolikor se spomnim

public class FilterServletOutputStream extends ServletOutputStream {
 
  private DataOutputStream stream; 
 
  public FilterServletOutputStream(OutputStream output) { 
    stream = new DataOutputStream(output); 
  }
 
  public void write(int b) throws IOException  { 
    stream.write(b); 
  }
 
  public void write(byte[] b) throws IOException  { 
    stream.write(b); 
  }
 
  public void write(byte[] b, int off, int len) throws IOException  { 
    stream.write(b,off,len); 
  } 
 
}    
    
public class GenericResponseWrapper extends HttpServletResponseWrapper { 
  private ByteArrayOutputStream output;
  private int contentLength;
  private String contentType;
 
  public GenericResponseWrapper(HttpServletResponse response) { 
    super(response);
    output=new ByteArrayOutputStream();
  } 
 
  public byte[] getData() {
    return output.toByteArray(); 
  } 
 
        @Override
  public ServletOutputStream getOutputStream() { 
    return new FilterServletOutputStream(output); 
  } 
  
        @Override
  public PrintWriter getWriter() { 
    return new PrintWriter(getOutputStream(),true); 
  } 
 
        @Override
  public void setContentLength(int length) { 
    this.contentLength = length;
    super.setContentLength(length); 
  } 
 
  public int getContentLength() { 
    return contentLength; 
  } 
 
        @Override
  public void setContentType(String type) { 
    this.contentType = type;
    super.setContentType(type); 
  } 
 
        @Override
  public String getContentType() { 
    return contentType; 
  } 
}