StreamCorruptedException using readObject()
I wrote a object to .ser file using writeObject().
and then again opened the file for writing in append mode,
and wrote again a object to the .ser file.
now the problem is using readObject() for the first time retrieve the first object added.
but again doing a readObject() does not return the second object added.instead it throws
java.io.StreamCorruptedException.folowing is the sample code
File file = new File("/home/dhans/travelcache/test.ser");
ObjectOutputStream os = new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream(file)));
HashMap hm = new HashMap();
hm.put("cd", "1001");
os.writeObject(hm);
os.flush();
os.close();
ObjectOutputStream os1 = new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream(file, true)));
// OPENED FILE FOR append mode
HashMap hm1 = new HashMap();
hm1.put("cd1", "1002");
os1.writeObject(hm1);
os1.flush();
os1.close();
ObjectInputStream is = new ObjectInputStream(
new BufferedInputStream(new FileInputStream(file)));
HashMap hm2 = (HashMap)is.readObject();
HashMap hm3 = (HashMap)is.readObject(); // exception occurs HERE
is.close();but if i add the two objects at a time like
ObjectOutputStream os = new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream(file)));
HashMap hm = new HashMap();
hm.put("cd", "1001");
os.writeObject(hm);
HashMap hm1 = new HashMap();
hm1.put("cd1", "1002");
os.writeObject(hm1);using the readObject() two times does not throw any exception.
but my requirement is i have to open the file for append mode again to write the second and successive objects .
any help would be helpful.
thanks,
dhanasekaran
Sory, I hadn't checked the src until u said. Coz I ws jst using the APIs.
Nw that I've checked the src....here's the complete code that writes to the file
public void write (File f) {
try {
ObjectOutputStream oos =
new ObjectOutputStream(new FileOutputStream(f));
oos.writeObject(this);
oos.close();
catch (IOException e) {
System.err.println("Exception writing file " + f + ": " + e);
private void writeObject (ObjectOutputStream out) throws IOException {
int i, size;
out.writeInt (CURRENT_SERIAL_VERSION);
out.writeObject(inputPipe);
out.writeObject(outputPipe);
out.writeObject (inputAlphabet);
out.writeObject (outputAlphabet);
size = states.size();
out.writeInt(size);
for (i = 0; i<size; i++)
out.writeObject(states.get(i));
size = initialStates.size();
out.writeInt(size);
for (i = 0; i <size; i++)
out.writeObject(initialStates.get(i));
out.writeObject(name2state);
if(weights != null) {
size = weights.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeObject(weights);
} else {
out.writeInt(NULL_INTEGER);
if(constraints != null) {
size = constraints.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeObject(constraints[i]);
} else {
out.writeInt(NULL_INTEGER);
if (expectations != null) {
size = expectations.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeObject(expectations[i]);
} else {
out.writeInt(NULL_INTEGER);
if(defaultWeights != null) {
size = defaultWeights.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeDouble(defaultWeights[i]);
} else {
out.writeInt(NULL_INTEGER);
if(defaultConstraints != null) {
size = defaultConstraints.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeDouble(defaultConstraints[i]);
} else {
out.writeInt(NULL_INTEGER);
if (defaultExpectations != null) {
size = defaultExpectations.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeDouble(defaultExpectations[i]);
} else {
out.writeInt(NULL_INTEGER);
if (weightsPresent != null) {
size = weightsPresent.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeObject(weightsPresent[i]);
} else {
out.writeInt(NULL_INTEGER);
if (featureSelections != null) {
size = featureSelections.length;
out.writeInt(size);
for (i=0; i<size; i++)
out.writeObject(featureSelections[i]);
} else {
out.writeInt(NULL_INTEGER);
if (weightsFrozen != null) {
size = weightsFrozen.length;
out.writeInt (size);
for (i = 0; i < size; i++)
out.writeBoolean (weightsFrozen[i]);
} else {
out.writeInt (NULL_INTEGER);
out.writeObject(globalFeatureSelection);
out.writeObject(weightAlphabet);
out.writeBoolean(trainable);
out.writeBoolean(gatheringConstraints);
out.writeBoolean(gatheringWeightsPresent);
//out.writeInt(defaultFeatureIndex);
out.writeBoolean(usingHyperbolicPrior);
out.writeDouble(gaussianPriorVariance);
out.writeDouble(hyperbolicPriorSlope);
out.writeDouble(hyperbolicPriorSharpness);
out.writeBoolean(cachedValueStale);
out.writeBoolean(cachedGradientStale);
out.writeBoolean(someTrainingDone);
out.writeInt(featureInducers.size());
for (i = 0; i < featureInducers.size(); i++) {
out.writeObject(featureInducers.get(i));
out.writeBoolean(printGradient);
out.writeBoolean (useSparseWeights);
out.writeInt (transductionType);
//Serialization of MaximizableCRF
private static final long serialVersionUID = 1;
private static final int CURRENT_SERIAL_VERSION = 0;
private void writeObject (ObjectOutputStream out) throws IOException {
out.writeInt (CURRENT_SERIAL_VERSION);
out.writeObject(trainingSet);
out.writeDouble(cachedValue);
out.writeObject(cachedGradient);
out.writeObject(infiniteValues);
out.writeInt(numParameters);
out.writeObject(crf);
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This exception i'm getting when i'm trying 2 use readObject().
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Pls reply me immediately.
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listallexbited.setText("List All Tractors On Exhibition ");
listallexbited.setPreferredSize(new java.awt.Dimension(157, 57));
listallexbited.setBackground(new java.awt.Color(0,255,255));
listallexbited.setForeground(new java.awt.Color(64,0,0));
listallexbited.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
outputscreen.repaint();
String XMLFile = "C:tractor.xml";
// Print contents of XML file
try {
String s;
BufferedReader in = new BufferedReader( new FileReader(XMLFile)
outputscreen.setText("File successfully opened");
try {
while ( (s=in.readLine()) !=null)
outputscreen.append(s);
catch(Exception e) {
outputscreen.append("Error reading line: " + e.getMessage());
outputscreen.append("End of Document");
catch(FileNotFoundException e) {
outputscreen.append("Error in opening file: " + e.getMessage());
addtractor = new JButton();
MenuButtons.add(getAddtractor());
addtractor.setText("Add Tractor ");
addtractor.setBackground(new java.awt.Color(0,255,255));
addtractor.setForeground(new java.awt.Color(64,0,0));
addtractor.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
String manufacturer =JOptionPane.showInputDialog(getComponent(0), "Enter Manufacturer of Tractor");
String shp = (JOptionPane.showInputDialog(getComponent(0), "Enter Horse Power of Tractor"));
int hp =Integer.parseInt(shp);
int sisRare =Integer.parseInt(JOptionPane.showInputDialog(getComponent(0), "Enter If the Tractor is rare (1=Yes/2=No)"));
boolean isRare;
if (sisRare== 1) {
isRare =true;
}else
isRare =false;
String yom= JOptionPane.showInputDialog(getComponent(0), "Enter Year of Manufacture");
int yearOfManufacture =Integer.parseInt(yom);
String yis =JOptionPane.showInputDialog(getComponent(0), "Enter Number of years the Tractor has been in service");
int yearsInService =Integer.parseInt(yis);
String svalue = JOptionPane.showInputDialog(getComponent(0), "Enter Tractor's Value (?Pounds)");
double value = Double.parseDouble(svalue);
String lastWorkPlace =JOptionPane.showInputDialog(getComponent(0), "Enter Last Workplace");
if(NewSwingApp.addTractor(new Tractor(manufacturer, hp, isRare, yearOfManufacture, yearsInService, value, lastWorkPlace, false)))
JOptionPane.showMessageDialog((getComponent(0)), "Tractor Added");
else
JOptionPane.showMessageDialog(getComponent(0), "Could not Add Tractor");
deletetractor = new JButton();
MenuButtons.add(getDeletetractor());
deletetractor.setText("Delete Tractor ");
deletetractor.setBackground(new java.awt.Color(0,255,255));
deletetractor.setForeground(new java.awt.Color(64,0,0));
deletetractor.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out.println("deletetractor.actionPerformed, event="+evt);
JOptionPane.showInputDialog(getComponent(0), "Enter Tractor ID");
exhibittractor = new JButton();
MenuButtons.add(getExhibittractor());
exhibittractor.setText("Exhibit Tractor");
exhibittractor.setBackground(new java.awt.Color(0,255,255));
exhibittractor.setForeground(new java.awt.Color(0,0,0));
exhibittractor.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out.println("exhibittractor.actionPerformed, event="+evt);
JOptionPane.showInputDialog(getComponent(0), "Enter Tractor I.D");
archivetractor = new JButton();
MenuButtons.add(getArchivetractor());
archivetractor.setText("Archive Tractor");
archivetractor.setBackground(new java.awt.Color(0,255,255));
archivetractor.setForeground(new java.awt.Color(0,0,0));
archivetractor.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out.println("archivetractor.actionPerformed, event="+evt);
JOptionPane.showInputDialog(getComponent(0), "Enter Tractor I.D");
searchmanufacturer = new JButton();
MenuButtons.add(searchmanufacturer);
searchmanufacturer.setText("Search Manufacturer");
searchmanufacturer.setPreferredSize(new java.awt.Dimension(159, 21));
searchmanufacturer.setBackground(new java.awt.Color(0,255,255));
searchmanufacturer.setForeground(new java.awt.Color(64,0,0));
searchmanufacturer.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out.println("searchmanufacturer.actionPerformed, event="+evt);
JOptionPane.showInputDialog(getComponent(0), "Enter Manufacturer Name");
outputscreen = new JTextArea();
getContentPane().add(outputscreen, BorderLayout.CENTER);
outputscreen
.setText("");
outputscreen.setBorder(BorderFactory.createTitledBorder(""));
outputscreen.setWrapStyleWord(true);
outputscreen.setEditable(false);
outputscreen.setEnabled(true);
outputscreen.setBackground(new java.awt.Color(255, 255, 255));
outputscreen.setForeground(new java.awt.Color(64, 0, 0));
companyname = new JLabel();
getContentPane().add(companyname, BorderLayout.NORTH);
companyname.setText(" Wolvesville Tractor Museum");
companyname.setPreferredSize(new java.awt.Dimension(609, 85));
companyname.setBackground(new java.awt.Color(255,255,0));
companyname.setFont(new java.awt.Font("Arial",1,28));
companyname.setForeground(new java.awt.Color(0,0,0));
companyname.setBorder(BorderFactory.createTitledBorder(""));
companyname.setOpaque(true);
this.setSize(750, 750);
} catch (Exception e) {
e.printStackTrace();
protected static boolean addTractor(Tractor tractor) {
if (tractor.getManufacturer()==null) return false; else
if (tractor.getHp()<50||tractor.getHp()>1100) return false; else
if (tractor.getIsRare()==false) return false; else
if (tractor.getYearsInService()<1||tractor.getYearsInService()>200) return false; else
if (tractor.getYearOfManufacture()<1800||tractor.getYearOfManufacture()>2008) return false; else
if (tractor.getValue()<100||tractor.getValue()>1500) return false; else
if (tractor.getLastWorkPlace()==null) return false; else
return true;
public JPanel getMenuButtons() {
return MenuButtons;
public JButton getListall() {
return listall;
public JLabel getCompanyname() {
return companyname;
public JButton getExitsystem() {
return jButton3;
public JButton getSearchmanufacturer() {
return searchmanufacturer;
public JButton getListallexbited() {
return listallexbited;
public JButton getAddtractor() {
return addtractor;
public JButton getDeletetractor() {
return deletetractor;
public JButton getExhibittractor() {
return exhibittractor;
public JButton getArchivetractor() {
return archivetractor;
public JTextArea getOutputscreenx() {
return outputscreen;
public void savetractors () {
try {
XMLEncoder encoder = new XMLEncoder(new FileOutputStream("tractor.xml"));
encoder.writeObject(tractors);
encoder.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
public void loadtractors () {
try {
XMLDecoder decoder = new XMLDecoder(new FileInputStream("tractor.xml"));
tractors = (Tractor[]) decoder.readObject();
decoder.close();
for (int i=0; i<tractors.length;i++) {
if (tractors!=null)numberOfTractors =i;
numberOfTractors++;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
tractors=new Tractor[25];
numberOfTractors=0;here's an example:
http://jdj.sys-con.com/read/37550.htm
you need to have a class Tractor with all those properties and then use readObject.Somehow you need to tell the Encoder/Decoder what Tractor means..
hope this helps!! -
Issue invoking webcatalog webservice in oracle11g
I am trying to use readObjects method as below
catalogObject = webCatalogService.readObjects(objectPath, false, eLevel, returnOption, sessionId);
to read a catalog object from the presentation layer catalog.
I get SOAPFaultException exception
The detailMessage in the Exception object is
Assertion failure: false at line 816 of C:\ADE\aime_bi\bifndn\analytics_web\main/project/websoap/soaphelpers.cpp
Any idea what this means and what should I look for more debugging?
Any help very appreciated as this is kind of urgent.
Thanks,
NeelThe code write like this:
ItemInfo[] items=catalog.getSubItems("/users/weblogic/test","*",true,null,sessionID);
but I met another question,Reports page's style and pictures are lost.
Do you know why? -
No cache hit on one-to-one mapping
I am experimenting with toplink and have found that toplink does not use cache when I read a object having one-to-one mapping with other object that have been already in memory.
e.g. I have an employee class that have a field with one-to-one mapping (with no indirection) to a department class
I have two objects of the employee class, that share the same object of department class (they work in the same department)
When I read (using readObject ) first object of the employee class, I expect an referenced object of the department class is read and placed in the session cache.
However when I read second object of the employee class, I recognized that toplink again issue SQL command to read the department class's objectHello,
Is employee-> department mapping using the full department pk in the reference? TopLink by default uses the check cache by primary key on all queries. This means that when the Employee object is built, it will query for the department object. This will cause it to search the cache for the department object only if it can create the full pk from the foreign key fields in the employee table, otherwise it will go to the database. Even though it may go to the database, it will still return the object from the cache to maintain object identity - it will only build the department object if one does not already exist with that pk in the cache.
Another circumstance this behaviour could occur is if the department object is removed from the identity map through garbage collection, or if no identitymap is being used.
Please check http://download-west.oracle.com/docs/cd/B10464_01/web.904/b10313/queries.htm#1134704
for info on TopLink queries with respect to the cache. If this is what is happening in your case and you want to have this specific department query go to the cache first, you can change it using an ammendment method on the employee descriptor. in the ammendment method, you will need to get the department mapping and use the getSelectionQuery() api to modify the associated query.
Best Regards,
Chris Delahunt -
Hi everyBody!!!
I m writing a client/server program in which client requests to the server to get the contents of the directory of the server computer (path of the directory is specified by client).
Server gets the contents fo the director by using the listFile() method and writes that contents onto the socket.
but the problem is:
how i can the read that contents from client side? server writes an array of type File onto the socket by using writeObject() method. And client definately will use readObject() method. but how i can read an array of type File from the client side???You gave the answer yourself: The Server may write the ARRAY of Files using write Objects and the Client will use readObject. Arrays are Objects too, so do not loop but just write:
On server Side
File [] allFiles = getThemFromSomewhere();
ObjectOutputStream oout = ...;
oout.writeObject(allFiles); // no loop here!
...On client side:
ObjectInputStream oin = ...;
File [] allFiles = (File[])oin.readObject()
...Well I don't really understand the way you want to do this, because the Files descriptions will be System dependent (and for FileTransfer FTP was created), so this will only make sense when you do interprocess communication on the same system. What do you want to achieve? -
For reasons too long to go into I have written a client server with SSL sockets that passes both objects of my own creation and vector containing Strings. My problem is detecting on the server end if the object stream contains my Object or the vectors before I write them to the database.
So i would like to be able to either be able to tell the type of object in the stream or get a look at what is in the object and then use an if/else to act depending on which object is in the stream. If I use readObject() it means that the data is already deserialized and so by the time I know what my object is it is too late to make a decision about how to process the data.
Does anyone know a creative use of one of the methods that would give me this info without deserializing the data? Or any suggestions would be very much appreciated
thanksYou can use a BufferedInputStream's mark() feature. Something like this should work:
InputStream is=soc.getInputStream();
BufferedInputStream bis=new BufferedInputStream();
bis.mark(10*1024); // at most 10 Kb before mark gets invalidated
ObjectInputStream ois=new ObjectInputStream(bis);
Object o=ois.readObject();
if(o instanceof Vector)
bis.reset(); // now a second call to ois.readObject() will return the same object
else
handle(o); -
We are using java 1.5 in our application on HP UX 11.
In one of the functionality we are saving java objects to hard disk and reading them later.
code is like --
file=new File(path);
fileOut = new FileOutputStream (file);
objOut = new ObjectOutputStream (fileOut);
objOut.writeObject(object);
objOut.close();
fileOut.close();
for reading we use readObject method.
In normal cases size of object files on disk is not more than 35 kb.
This works fine in normal scenarios but if end user enters some special characters from MS word or excel then size of files is increased to 100 MB dramatically.If we open the object file in some editor then we can see a series of latin characters like à à à à à à (millions of characters).
While taking input from application user we are accepting only 20 characters.
I am not able to understand how single character is converted to millions of characters?
This is killing JVM...Thanks for reply.
I have created a sample class saveObject for example.This will write object in C drive in case of windows (<1kb).
import java.io.File;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
public class saveObject {
public saveObject() {
public static void writeObject(Object object , String path) {
File file=null;
FileOutputStream fileOut=null;
ObjectOutputStream objOut=null;
try {
file=new File(path);
fileOut = new FileOutputStream (file);
objOut = new ObjectOutputStream (fileOut);
objOut.writeObject(object);
objOut.close();
fileOut.close();
} catch (Exception e){
e.printStackTrace();
} finally {
file=null;
fileOut=null;
objOut=null;
public static void main(String[] args) {
writeObject("WallStreet 2nd A LA","C://test.obj");
}We are facing issue only in HP UNIX . The code works fine in Windows and Linux environment.
More Details : We have web application in which we accept data from users in html forms and save this to disk on temporary basis.
Issue is faced with address field where user is doing copy paste from excel/word rather than typing in form. -
This topic may not be appropriate for the 2D forum, but I couldn't find one that deals with images. Please let me know if there's a more appropriate forum.
I use Java 1.4/JBoss 3.22/Oracle 9i.
I have a swing client that occasionally needs to transfer image files (jpg and dxf) to and from the database across the WAN. The file size is typically 1MB. I use RMI-over-HTTP for EJB communication between the client and server.
I need to figure out a way to transfer the files. The ideal would be to bundle BufferedImages in a transfer object that the session bean hands to the client. But, since BufferedImage is not Serializable I need a different method.
How do people typically do this type of transfer?
I appreciate any ideas you can offer.
Thanks,
--BobCI'm the original poster.
I've solved the problem of transferring BufferedImages between a client and server using an EJB. I wrote a TransferImage class that wraps the BufferedImage in a byte array, which is serializable. Then I transfer an instance of that object using the bean, and then use readObject() to reconstitute the BufferedImage.
Here is the TransferImage class:
package com.whatever;
import java.awt.image.PixelGrabber;
import java.awt.image.BufferedImage;
import java.awt.*;
import java.io.Serializable;
import java.io.IOException;
* This class allows BufferedImages to be serialized so that they can be tranferred
* using an EJB.
* <p>
* NOTE: System.out.printlns are used for logging rather than Log4j for serialization.
* Author: Bob Carpenter [email protected]
* Date: Feb 4, 2004
public class TransferImage extends Canvas
implements Serializable {
private transient BufferedImage image = null;
private int imageType = BufferedImage.TYPE_INT_BGR;
private Object pix = null;
private int width = 0;
private int height = 0;
* Basic ctor.
* <p>
* NOTE: Creates serializable pix object from image.
* @param image buffered image to be transferred
* @param imageType type of image - see BufferedImage class
public TransferImage(BufferedImage image, int imageType)
throws IOException {
System.out.println("TransferImage.ctor_entry");
this.image = image;
this.imageType = imageType;
writeObject();
System.out.println("TransferImage.exit_entry");
* Writes the image to pix object.
* <p>
* NOTE: Uses PixelGrabber to create pix object.
* @throws IOException
private void writeObject() throws IOException {
System.out.println("TransferImage.writeObject_entry");
try {
PixelGrabber grabber = new PixelGrabber(image, 0, 0, -1, -1, true);
grabber.grabPixels();
this.width = grabber.getWidth();
this.height = grabber.getHeight();
System.out.println("TransferImage.writeObject - width = " +width);
System.out.println("TransferImage.writeObject - height = " +height);
pix = grabber.getPixels();
catch(InterruptedException ex) {
throw new IOException("writeObject - ERROR: " +ex);
System.out.println("TransferImage.writeObject_exit");
* Reads the pix object and creates a BufferedImage from it.
* @throws IOException
public BufferedImage readObject() throws IOException {
System.out.println("TransferImage.readObject_entry");
try {
int[] imgPix = (int[])pix;
System.out.println("TransferImage.readObject - imgPixLength = " +imgPix.length);
image = new BufferedImage(width, height, imageType);
image.setRGB(0, 0, width, height, imgPix, 0, width);
catch (Exception ex) {
System.out.println("TransferImage.readObject - ERROR: " +ex);
System.out.println("TransferImage.readObject_exit");
return image;
* Reads the pix object and returns an array of pixel bytes.
* <p>
* NOTE: Doesn't work
* @throws IOException
public byte[] readPix() throws IOException {
System.out.println("TransferImage.readPix_entry");
// Setup
byte[] result = null;
try {
if(pix == null) throw new Exception("found null pix object");
int[] imgPix = (int[])pix;
int imgPixLen = imgPix.length;
// Convert to bytes - this times out
for(int i=0; i<imgPix.length; i++) {
result = new byte[imgPixLen*4];
int j, shift;
for(j = 0, shift = 24; j < 4; j++, shift -= 8)
result[i] += (byte)(0xFF & (imgPix[i] >> shift));
if(result == null) throw new Exception("not able to read pix object");
System.out.println("TransferImage.readPix - pixArrayLength = " +result.length);
catch (Exception ex) {
System.out.println("TransferImage.readPix - ERROR: " +ex);
System.out.println("TransferImage.readPix_exit");
return result;
// Accessors
* Gets the BufferedImage object.
* @return
public BufferedImage getImage() {
return image;
* Gets height of image in pixels.
* @return
public int getHeight() {
return height;
* Gets width of image in pixels.
* @return
public int getWidth() {
return width;
To use the class do this:
//on client (for example)
BufferedImage bufi = ImageIO.read(new File(<some_filePath>));
TransferImage tbufi = new TransferImage(bufi, BufferedImage.TYPE_INT_BGR);
//send tbufi to backend using something like a session bean and a transfer object
//on backend reconstitute the buffered image
TransferImage tbufi = spVO.getImage(); //spVO is my transfer object
BufferedImage bufi = tbufi.readObject();
I'd like to get readPix() working so that a byte array is returned which can feed directly into a ByteArrayInputStream, which can be useful for things like writing to a BLOB. So, if you figure out how to do that please share it.
Take care,
--BobC
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