Tubería Rota

Estimados:

Tengo una aplicación en java, la cual está instalada en 03 glassfish v3, los cuales están balanceados mediante el mod_proxy mediante apache como front-end. Ahora bien, cada cierto tiempo en los log de los servidores me está apareciendo el siguiente error:

[#|2014-06-22T09:20:32.242-0400|SEVERE|glassfish3.1.2|papeleta.PdfHandler|_ThreadID=178;_ThreadName=Thread-2;|DocumentException: DocumentException: ExceptionConverter: org.apache.catalina.connector.ClientAbortException: java.io.IOException: Tubería rota
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:430)
at com.sun.grizzly.util.buf.ByteChunk.append(ByteChunk.java:385)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:455)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:442)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:160)
at java.io.BufferedOutputStream.write(BufferedOutputStream.java:122)
at com.lowagie.text.pdf.OutputStreamCounter.write(OutputStreamCounter.java:160)
at java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:154)
at com.lowagie.text.pdf.PdfStream.toPdf(PdfStream.java:307)
at com.lowagie.text.pdf.PdfIndirectObject.writeTo(PdfIndirectObject.java:167)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:370)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:350)
at com.lowagie.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:303)
at com.lowagie.text.pdf.PdfWriter.addToBody(PdfWriter.java:1991)
at com.lowagie.text.pdf.PdfWriter.add(PdfWriter.java:1040)
at com.lowagie.text.pdf.PdfWriter.addDirectImageSimple(PdfWriter.java:1015)
at com.lowagie.text.pdf.PdfWriter.addDirectImageSimple(PdfWriter.java:940)
at com.lowagie.text.pdf.PdfContentByte.addImage(PdfContentByte.java:1204)
at com.lowagie.text.pdf.PdfContentByte.addImage(PdfContentByte.java:1107)
at com.lowagie.text.pdf.PdfContentByte.addImage(PdfContentByte.java:1091)
at com.lowagie.text.pdf.PdfDocument.add(PdfDocument.java:2022)
at com.lowagie.text.pdf.PdfDocument.add(PdfDocument.java:1989)
at papeleta.PdfHandler.onStartPage(PapeletaPdfServlet.java:110)
at com.lowagie.text.pdf.PdfDocument.initPage(PdfDocument.java:2279)
at com.lowagie.text.pdf.PdfDocument.newPage(PdfDocument.java:836)
at com.lowagie.text.pdf.PdfDocument.addPTable(PdfDocument.java:1000)
at com.lowagie.text.pdf.PdfDocument.add(PdfDocument.java:1904)
at com.lowagie.text.Document.add(Unknown Source)
at papeleta.PapeletaPdfServlet.processRequest(PapeletaPdfServlet.java:2736)
at papeleta.PapeletaPdfServlet.doGet(PapeletaPdfServlet.java:2757)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at cl.zeke.armada.msa.filtro.FiltroTicket.doFilter(FiltroTicket.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.io.IOException: Tubería rota
at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
at sun.nio.ch.IOUtil.write(IOUtil.java:65)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:487)
at com.sun.grizzly.util.OutputWriter.flushChannel(OutputWriter.java:108)
at com.sun.grizzly.util.OutputWriter.flushChannel(OutputWriter.java:76)
at com.sun.grizzly.http.SocketChannelOutputBuffer.flushChannel(SocketChannelOutputBuffer.java:426)
at com.sun.grizzly.http.SocketChannelOutputBuffer.flushBuffer(SocketChannelOutputBuffer.java:498)
at com.sun.grizzly.http.SocketChannelOutputBuffer.realWriteBytes0(SocketChannelOutputBuffer.java:382)
at com.sun.grizzly.http.SocketChannelOutputBuffer.realWriteBytes(SocketChannelOutputBuffer.java:364)
at com.sun.grizzly.tcp.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:894)
at com.sun.grizzly.tcp.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:167)
at com.sun.grizzly.tcp.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:661)
at com.sun.grizzly.tcp.Response.doWrite(Response.java:685)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:425)
... 60 more
|#]

Ahora bien, averiguando en este sentido alguien por ahí comentó que puede ser un problema de "keep-alive" de las conexiones, de lo cual no estoy muy convencido o más bien carezco de las herramientas o conocimientos necesarios para emitir una opinión informada.

Si alguien de esta grandiosa comunidad pudiera darme una idea o algo por donde empezar se lo agradecería muchísimo.

Afectuosos saludos a todos