Allocate exception for servlet...

Question

Hello,
Thanks for your help...
My servlet returns files, it has been working fine all the time but now I added the code below so I am getting an "Allocate exception for servlet" I have no idea what is this about as the servlet compiles successfully, could you help me to find the error?
                         // take the message from the URL or create default message
                         String msg = req.getParameter("attachment");
                         if (msg == null || msg.trim().length() <= 0)
                              msg = "[ specify a message in the 'msg' argument on the URL ]";
                         // create simple doc and write to a ByteArrayOutputStream
                         Document document = new Document();
                         ByteArrayOutputStream baos = new ByteArrayOutputStream();
                         PdfWriter.getInstance(document, baos);
                         document.open();
                         document.add(new Paragraph(msg));
                         document.add(Chunk.NEWLINE);
                         //document.add(new Paragraph("The method used to generate this PDF was: " + methodGetPost));
                         document.close();
                         // setting some response headers
                         resp.setHeader("Expires", "0");
                         resp.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
                         resp.setHeader("Pragma", "public");
                         // setting the content type
                         resp.setContentType("application/pdf");
                         // the contentlength is needed for MSIE!!!
                         resp.setContentLength(baos.size());
                         // write ByteArrayOutputStream to the ServletOutputStream
                         ServletOutputStream out = resp.getOutputStream();
                         baos.writeTo(out);
                         out.flush();
                    

Answer 1

Here it is...
[WARN] StandardWrapperValve[ImageService]: Allocate exception for servlet ImageService
javax.servlet.ServletException: Error instantiating servlet class org.eagle.cap.server.ImageService
     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:996)
     at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:687)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:144)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
Thanks!