iText

[cesar]

hello all,
i have a view that works well for a time but after a hours begin to throws exception all the requests:

the view is:

public class FormularioPdfView extends AbstractView {
	
	private static final int OUTPUT_BYTE_ARRAY_INITIAL_SIZE = 1024;

	public FormularioPdfView() {
		setContentType("application/pdf");
	}
	
	protected final void renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response) throws Exception {

		ByteArrayOutputStream byteFormulario = new ByteArrayOutputStream(OUTPUT_BYTE_ARRAY_INITIAL_SIZE);
		
		Map pdfFields = (Map)model.get("pdfFields");
		byte[]  templateImpreso = (byte[])model.get("templateImpreso");

		pasteTemplateFormulario(pdfFields, templateImpreso, byteFormulario);

		// Write content type and also length (determined via byte array).
		response.setContentType(getContentType());
		response.setHeader("Content-disposition", "attachment" );
		response.setContentLength(byteFormulario.size());

		// Flush byte array to servlet output stream.
		ServletOutputStream out = response.getOutputStream();
		byteFormulario.writeTo(out);
		out.flush();
	}

	private void pasteTemplateFormulario(Map fieldsForm, byte[] bImpreso, OutputStream byteFormulario) throws Exception 
	{
		PdfReader reader = new PdfReader(bImpreso);

		PdfStamper stamp = new PdfStamper(reader, byteFormulario);
		AcroFields acroFields = stamp.getAcroFields();

		Iterator entries = fieldsForm.entrySet().iterator();
		while (entries.hasNext())
		{
			Map.Entry entry = (Map.Entry)entries.next();
			String key = entry.getKey().toString();
			String value = (entry.getValue() != null ? entry.getValue().toString() : "");
			acroFields.setField(key, value);
		}
		stamp.close(); // throw NullPointerException
	}
}

the exception:

[9/05/05 13:50:28:691 CEST] 2c006234 WebGroup      X Servlet Error: : java.lang.NullPointerException
	at com.lowagie.text.pdf.PRStream.toPdf(PRStream.java(Compiled Code))
	at com.lowagie.text.pdf.PdfIndirectObject.writeTo(PdfIndirectObject.java(Compiled Code))
	at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java(Compiled Code))
	at com.lowagie.text.pdf.PdfWriter.addToBody(PdfWriter.java(Inlined Compiled Code))
	at com.lowagie.text.pdf.PdfStamperImp.close(PdfStamperImp.java(Compiled Code))
	at com.lowagie.text.pdf.PdfStamper.close(PdfStamper.java:185)
	at iam.formularios.web.views.FormularioPdfView.pasteTemplateFormulario(FormularioPdfView.java:123)
	at iam.formularios.web.views.FormularioPdfView.renderMergedOutputModel(FormularioPdfView.java:83)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:917)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:696)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:623)
	at org.springframework.web.servlet.FrameworkServlet.serviceWrapper(FrameworkServlet.java:384)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:344)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:827)
	at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:167)
	at com.ibm.servlet.engine.webapp.IdleServletState.service(StrictLifecycleServlet.java:297)
	at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:110)
	at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:472)
	at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:1012)
	at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:913)
	at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:721)
	at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:374)
	at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:118)
	at com.ibm.servlet.engine.srt.WebAppInvoker.doForward(WebAppInvoker.java:134)
	at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:239)
	at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67)
	at com.ibm.servlet.engine.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:106)
	at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:154)
	at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:317)
	at com.ibm.servlet.engine.http11.HttpConnection.handleRequest(HttpConnection.java:60)
	at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:477)
	at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:351)
	at com.ibm.ws.util.CachedThread.run(ThreadPool.java(Compiled Code))

anyone what happen???

thanks in advance,
César.

[Rod Johnson]

Have you checked the iText source code? I would think that looking there would be a good starting point. It doesn't look to be anything Spring's doing from a quick glance at the stack trace. Does iText have forums or mailing lists?

[Costin Leau]

Mailing list: http://sourceforge.net/mailarchive/f...?forum_id=3273
Home page: http://www.lowagie.com/iText/

Have you tried using the latest release (out on may 11th)?

[cesar]

thank you very much,

i was using iText 1.1.4 (spring zip 1.5).
i have upgrade iText version to 1.3, and works well.

thanks,
César.

[Costin Leau]

Excelent!