Exceptions, odd behavior of streaming data to outputstream
I have a servlet which writes mp3 data to the dataoutputstream of a servlet response object. For some reason, the servlet method writes the data out and gets an exception. Then the method/servlet is called again automatically and begins to write the data out again. The exception is below. In the end the mp3 is delivered to the client fine, however with server side exceptions and odd behavior.
try {
int len = 0;
resp.setContentType("audio/mpeg");
String filename = req.getParameter("file");
File mp3 = new File(mediaDir + filename);
byte[] buf = new byte[1024];
FileInputStream fis = new FileInputStream(mp3);
DataOutputStream o = new DataOutputStream(resp.getOutputStream());
while( (len = fis.read(buf)) != -1) {
o.write(buf, 0, len);
o.flush();
resp.flushBuffer();
o.close();
fis.close();
catch(Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
null
ClientAbortException: java.net.SocketException: Connection reset by peer: socket write error
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:366)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:403)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:323)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:392)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:381)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:76)
at java.io.DataOutputStream.write(DataOutputStream.java:90)
at TrafficControl.streamAudio(TrafficControl.java:639)
at TrafficControl.processRequest(TrafficControl.java:136)
at TrafficControl.doGet(TrafficControl.java:61)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)thanks
Edited by: black_lotus on 19-Feb-2009 3:08 PM
There are some versions of some browsers (MS IE) that can call a servlet twice; they only look at the headers at the first request, in order to decide whether to display a "save or open" dialog, or some such reason. Try different browsers; also log the User-Agent header to see if it is "contype", which is present when the multiple request thing happens.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q293792
"Connection reset" can also happen if the client closes the connection without reading the entire response. Occasional resets will happen as users cancel download.
Not a source of exceptions but something you may still want to consider when sending large responses: by default, the servlet container will have to buffer the entire file in memory to find out its length. To save memory, either set content length before writing the data, or use chunked encoding (google should find details.) That way your write() actually streams data to the user.
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null -
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: SP5.
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panel.add(useCompositeChk = new JCheckBox("Use Composite", true));
useCompositeChk.addActionListener(this);
panel.add(useCompositeContextChk = new JCheckBox("Use Composite Context", true));
useCompositeContextChk.addActionListener(this);
panel.add(useAntialiasingChk = new JCheckBox("Use Antialiasing"));
useAntialiasingChk.addActionListener(this);
cp.add(panel, BorderLayout.SOUTH);
pack();
setVisible(true);
public void actionPerformed(ActionEvent evt) {
useCompositeContextChk.setEnabled(useCompositeChk.isSelected());
invalidate();
repaint();
private class TestCanvas
extends JComponent {
public TestCanvas() {
setSize(300, 300);
setPreferredSize(getSize());
public void paint(Graphics gfx) {
Dimension size = getSize();
Graphics2D gfx2D = (Graphics2D) gfx;
gfx2D.setColor(Color.GRAY);
gfx2D.fillRect(0, 0, size.width, size.height);
RenderingHints rh = null;
if(useAntialiasingChk.isSelected()) {
rh = gfx2D.getRenderingHints();
gfx2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Rectangle r = clippingShape.getBounds();
//gfx2D.setColor(Color.GREEN);
//gfx2D.drawRect(r.x, r.y, r.width, r.height);
gfx2D.setColor(Color.YELLOW);
gfx2D.fill(clippingShape);
Composite oldComposite = null;
if(useCompositeChk.isSelected()) {
oldComposite = gfx2D.getComposite();
gfx2D.setComposite(composite);
gfx2D.setColor(Color.ORANGE);
gfx2D.fillRect(r.x, r.y, r.width + 1, r.height + 1);
if(oldComposite != null)
gfx2D.setComposite(oldComposite);
if(rh != null)
gfx2D.setRenderingHints(rh);
public class MergeComposite
implements Composite, CompositeContext {
public CompositeContext createContext(ColorModel srcColorModel,
ColorModel dstColorModel,
RenderingHints hints) {
return this;
public void compose(Raster src,
Raster dstIn,
WritableRaster dstOut) {
if(!useCompositeContextChk.isSelected())
return;
int[] srcPixel = null;
int[] dstPixel = null;
for(int sy = src.getMinY(); sy < src.getMinY() + src.getHeight(); sy++) {
for(int sx = src.getMinX(); sx < src.getMinX() + src.getWidth(); sx++) {
int cx = sx - dstOut.getSampleModelTranslateX();
int cy = sy - dstOut.getSampleModelTranslateY();
if(!clippingShape.contains(cx, cy)) continue;
srcPixel = src.getPixel(sx, sy, srcPixel);
int ox = dstOut.getMinX() + sx - src.getMinX();
int oy = dstOut.getMinY() + sy - src.getMinY();
if(ox < dstOut.getMinX() || ox >= dstOut.getMinX() + dstOut.getWidth()) continue;
if(oy < dstOut.getMinY() || oy >= dstOut.getMinY() + dstOut.getHeight()) continue;
dstPixel = dstIn.getPixel(ox, oy, dstPixel);
float mergeFactor = 1.0f * (cy - 100) / 100;
dstPixel[0] = merge(mergeFactor, srcPixel[0], dstPixel[0]);
dstPixel[1] = merge(mergeFactor, srcPixel[1], dstPixel[1]);
dstPixel[2] = merge(mergeFactor, srcPixel[2], dstPixel[2]);
dstOut.setPixel(ox, oy, dstPixel);
protected int merge(float mergeFactor, int src, int dst) {
return (int) (mergeFactor * src + (1.0f - mergeFactor) * dst);
public void dispose() {
public static void main(String[] args) {
new TestCustomComposite2();
}I got a better version to work as expected. Though there will probably be issues with the transformation to display coordinates as mentioned before. At least figured out some of the kinks of using a custom Composite/CompositeContext object.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
public class TestCustomComposite2
extends JFrame
implements ActionListener {
private JCheckBox useCompositeChk, useAntialiasingChk, useCompositeContextChk;
private Shape clippingShape = new Ellipse2D.Float(100, 100, 100, 100);
private MergeComposite composite = new MergeComposite();
public TestCustomComposite2() {
super("Test Custom Composite");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel cp = (JPanel) getContentPane();
cp.setLayout(new BorderLayout());
cp.add(new TestCanvas(), BorderLayout.CENTER);
JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
panel.add(useCompositeChk = new JCheckBox("Use Composite", true));
useCompositeChk.addActionListener(this);
panel.add(useCompositeContextChk = new JCheckBox("Use Composite Context", true));
useCompositeContextChk.addActionListener(this);
panel.add(useAntialiasingChk = new JCheckBox("Use Antialiasing"));
useAntialiasingChk.addActionListener(this);
cp.add(panel, BorderLayout.SOUTH);
pack();
setVisible(true);
public void actionPerformed(ActionEvent evt) {
useCompositeContextChk.setEnabled(useCompositeChk.isSelected());
invalidate();
repaint();
private class TestCanvas
extends JComponent {
public TestCanvas() {
setSize(300, 300);
setPreferredSize(getSize());
public void paint(Graphics gfx) {
Dimension size = getSize();
Graphics2D gfx2D = (Graphics2D) gfx;
gfx2D.setColor(Color.GRAY);
gfx2D.fillRect(0, 0, size.width, size.height);
RenderingHints rh = null;
if(useAntialiasingChk.isSelected()) {
rh = gfx2D.getRenderingHints();
gfx2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Rectangle r = clippingShape.getBounds();
//gfx2D.setColor(Color.GREEN);
//gfx2D.drawRect(r.x, r.y, r.width, r.height);
gfx2D.setColor(Color.YELLOW);
gfx2D.fill(clippingShape);
Composite oldComposite = null;
if(useCompositeChk.isSelected()) {
oldComposite = gfx2D.getComposite();
gfx2D.setComposite(composite);
gfx2D.setColor(Color.ORANGE);
gfx2D.fillRect(r.x, r.y, r.width + 1, r.height + 1);
if(oldComposite != null)
gfx2D.setComposite(oldComposite);
if(rh != null)
gfx2D.setRenderingHints(rh);
public class MergeComposite
implements Composite, CompositeContext {
public CompositeContext createContext(ColorModel srcColorModel,
ColorModel dstColorModel,
RenderingHints hints) {
return this;
public void compose(Raster src,
Raster dstIn,
WritableRaster dstOut) {
// dumpRaster("SRC ", src);
// dumpRaster("DSTIN ", dstIn);
// dumpRaster("DSTOUT", dstOut);
// System.out.println();
if(dstIn != dstOut)
dstOut.setDataElements(0, 0, dstIn);
if(!useCompositeContextChk.isSelected())
return;
int[] srcPixel = null;
int[] dstPixel = null;
int w = Math.min(src.getWidth(), dstIn.getWidth());
int h = Math.min(src.getHeight(), dstIn.getHeight());
int xMax = src.getMinX() + w;
int yMax = src.getMinY() + h;
for(int x = src.getMinX(); x < xMax; x++) {
for(int y = src.getMinY(); y < yMax; y++) {
try {
// THIS MIGHT NOT WORK ALL THE TIME
int cx = x - dstIn.getSampleModelTranslateX();
int cy = y - dstIn.getSampleModelTranslateY();
if(!clippingShape.contains(cx, cy)) {
dstPixel = dstIn.getPixel(x, y, dstPixel);
dstOut.setPixel(x, y, dstPixel);
else {
srcPixel = src.getPixel(x, y, srcPixel);
dstPixel = dstIn.getPixel(x, y, dstPixel);
float mergeFactor = 1.0f * (cy - 100) / 100;
dstPixel[0] = merge(mergeFactor, srcPixel[0], dstPixel[0]);
dstPixel[1] = merge(mergeFactor, srcPixel[1], dstPixel[1]);
dstPixel[2] = merge(mergeFactor, srcPixel[2], dstPixel[2]);
dstOut.setPixel(x, y, dstPixel);
catch(Throwable t) {
System.out.println(t.getMessage() + " x=" + x + " y=" + y);
protected int merge(float mergeFactor, int src, int dst) {
return (int) (mergeFactor * src + (1.0f - mergeFactor) * dst);
protected void dumpRaster(String lbl,
Raster raster) {
System.out.print(lbl + ":");
System.out.print(" mx=" + format(raster.getMinX()));
System.out.print(" my=" + format(raster.getMinY()));
System.out.print(" rw=" + format(raster.getWidth()));
System.out.print(" rh=" + format(raster.getHeight()));
System.out.print(" tx=" + format(raster.getSampleModelTranslateX()));
System.out.print(" ty=" + format(raster.getSampleModelTranslateY()));
System.out.print(" sm=" + raster.getSampleModel().getClass().getName());
System.out.println();
protected String format(int value) {
String txt = Integer.toString(value);
while(txt.length() < 4)
txt = " " + txt;
return txt;
public void dispose() {
public static void main(String[] args) {
new TestCustomComposite2();
} -
PLEASE HELP!
My iMac 21" late -09, started acting a bit wierd a year ago. Things got worse rapidly, it got slower, the screen flickers/tears (see link below), short moments of lost internet connection, lost connection whit the keyboard (might be keyboard that is broken), almost overheats when gaming and odd behavior on some webbsites whit galleries and/or videos.
Let's begin whit the screen: it's not vertikal lines or major distortions, just a subtle horisontal line that "wanders" from bottom to topp and some lagging from time to time. Looks like this: http://cl.ly/3i2W2o3S1D2T
The wierd thing is that hi-res does not mean more "tearing". Yes the lagg and risk of tearing increases, but the connection seems to be: lots of movement=tearing. So a pixeld 240p video of people dancing can be way worse than a news debbate in1080p!?!
Lost connection whit internet and keyboard rarely happens and is probably due to something else, but thought that was good to have in mind.
Odd behavior: galleries ex: when browsing images on Facebook in fullscreen, the image sometimes jumps around in the beginning and when clicking on next the same picture might appear again or just nothing at all. When scrolling down overwiewing a gallery, the updating stops and you can't scroll down further. This problem appers mainly on FB, deviantart also acts a bit wierd but there is often small issues whit image sites. Doesn't help to switch browsers either!
Videos: Youtube is horrible to use, stops loading, dosen't start loading, erases everything loaded (grey bar disapears and reloads), refuse to switch ressolution and suddenly stops the video like it was done! "ehh.. wasn't this 2min long? Not anymore, now its 34sec!". Mainly a Youtube problem but many similar sites can be a bit problematic to use.
NO, it's not the HTML-5 problem or any standard flash issue and using a different browser dosen't help!
Worst is the fact that most of these errors are not constant! One day your watching youtube or mabey a movie in VLC, a bit laggy, but almost no problem. Next day **** brakes lose and after 2hours of struggling you are ready to stabb yourself in the face!
What i tried: Most easy buggfixes that might cause the above problems, updating most things, Switched from OS X SL to OS X ML, complete reinstall and some things i probably forgot by now. Then went to MacStore for repair, they didn't find anything wrong and said it worked fine after the standard diagnostic/repair program!?! Went home and everything was the same! Went a second time to MacStore, same result.
So I'v reinstalled a few times and it seems to improve the Mac. But 2-3weeks later every error is back, even if I barely installed or downloaded anything!?!
Any idea what this could be? Or is the graphic card broken and MacStore has a blind, inbred muppet as a technician?No I didn't. The first time i explained the problem thoroughly and thought that they just couldn't miss such a visual error. I was wrong. The second time the technician wasn't there so i showed the above clip to the salesstaff and explained everything onceagain. Later the technician called me and we talked for 10min.
Btw, the problems always "manifests themselves", just varies between strenght and frequence.
But all other issues aside, what could cause the tearing of the screen as seen int the above clip? -
Parse Exception : java.text.ParseException: Unparseable date
I have inherited a UDF in some mapping that on the whole, works okay...
but it throws an error after mapping a few dates:
Parse Exception : java.text.ParseException: Unparseable date: "2010-03-18T00:00:00.000Z"
Parse Exception : java.text.ParseException: Unparseable date: "2010-03-23T23:59:00.000Z"
Parse Exception : java.text.ParseException: Unparseable date: "2010-03-18T00:00:00.000Z"
Parse Exception : java.text.ParseException: Unparseable date: "2010-03-23T23:59:00.000Z"
Parse Exception : java.text.ParseException: Unparseable date: "2010-03-18T00:00:00.000Z"
Parse Exception : java.text.ParseException: Unparseable date: "2010-03-23T23:59:00.000Z"
the first few map okay... then i get the exception.
the UDF is as follows:
public String convertDateTimeToUTC(String strDate, Container container) throws StreamTransformationException{
AbstractTrace trace = container.getTrace();
Date date=null;
SimpleDateFormat sdfSource = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
try{
String dt = strDate;
date = sdfSource.parse(dt);
trace.addInfo("Local Date:"+date);
SimpleDateFormat sdfDestination = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
strDate = sdfDestination.format(date);
catch(ParseException pe){
trace.addInfo("Parse Exception : " + pe);
return strDate;
can anyone see why this fails after successfully mapping a few fields???the first mapping works correctly...
then we reuse the same fields to map to the additional segments.
the context is correct as it is trying to pull the same fields in... it just throw the error with the same data in the same UDF/Function Library but for different segments! :o(
http://img199.imageshack.us/img199/3104/dateconversion.jpg
as you can see from the screenshot above, the mapping works in the first instance, then fails on subsequent nodes. -
HT4623 I just updated my iphone 4s and lost all my photos except in the photo stream.
I just updated my iphone, but lost all my photos except in the photo stream.... I did back it up before i updated. Anyone know where they could be?
/Are you using itunes or icloud backup? http://support.apple.com/kb/HT1766
-
Stream data from a subvi to the main vi
Hi
I’m wondering if someone can help me. I’m trying to stream data from a sub vi to the main vi without opening and closing the sub vi continuously. The data also needs to be extracted from a while loop within the sub vi. background info: The sub vi controls a photomultipler tube, which once it is on it is best kept on. The PMT signal is generated in while loop of the sub vi. Attached are some basic vis showing what I’m trying to do.
Thanks
Attachments:
Main page.vi 11 KB
test2.vi 13 KBIf you are streaming measurements continously I would consider using a circular buffer instead of the queued producer/consumer approach.
Check out this implementataion of such a buffer, use only this if your DAQ device does not have an internal circular buffer.
https://decibel.ni.com/content/docs/DOC-20403
Alternatively if you are using a DAQmx device, consider using the device buffer for sharing DAQ data between loops.
Br,
/Roger -
Stream data from a subvi to the main vi - path refnum
hello everyone
sorry my english
http://forums.ni.com/t5/LabVIEW/stream-data-from-a-subvi-to-the-main-vi/m-p/2205150/highlight/true#M...
- refnum boolean worked
- refnum graph worked
- refnum numeric worked
how to create a path refnum? stream data from a subvi to the main vi
where do I start?
thank
Solved!
Go to Solution.Bom Dia Saille,
Eu acredito que o que você tenha hoje seja isso aqui (Desenho bem simplificado):
Hoje o que você tem é o Aplicativo do Medidor + USB Driver controlando o seu medidor. Basicamente, sua aplciação está dividida em três camadas:
Aplicação - Onde estão as funcionalidades principais do programa (interface com o usuário, apresentação de dados, geração de arquivos, etc.)
VISA - Uma arquitetura de Software para controle de instrumentos. Basicamente, ele se comunica com o Driver USB para poder enviar e receber pacotes de dados através do barramento USB.
Device Driver - Intruções de SW de baixo nível para controlar um periférico através de um barramento.
No desenho, eu aponto duas camadas onde você pode tentar atuar para automatizar suas medições:
Aplicação - Você pode usar o VI Server para controlar o Aplicativo do Medidor (Se este aplicativo tiver sido desenvolvido em LabVIEW, o que eu suponho ser verdade). No entanto é necessário saber se o desenvolvedor do produto permitiu isso (Veja Using VI Server to Pass Data Between a VI and a LabVIEW Executable). Outra alternativa é conversar com o fabricante para ver se ele desenvolveu alguma API (Application Programming Interface) para que você consiga controlar o instrumento diretamente.
VISA - O LabVIEW Fornece uma API chamada NI-VISA para poder enviar e receber informações através de diversos barramentos (Veja Serial Instrument Control Tutorial)
É possível acessar o Driver diretamente também, mas eu não recomendo. O resultado não compensa o esfroço!
Espero ter esclarecido suas dúvidas e espero que você tenha sucesso na sua aplicação!!
Atenciosamente.
Felipe Flores
Engenharia de Aplicações
National Instruments Brasil
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