Read a field of a serialized object

Hi,
is-it possible to read separately a field of a serialized object? By exemple, if I serialize an object that contains a String field, can I read only this String field?
Thanks
Jean

You can do so, if you re-implement Java's serialization spec. That or overload readObject() and wait for your individual field to come in, trap the result and forward it on.
As you can see from either of these alternatives, there is not a good way to do this. It's like asking 'how can I get an XML fragment from a file?" That task is, on the face of it, far easier. But it equally does not make sense.
If you have control over the serialization, and you have a key lookup field, serialize it separately in an index-like file or serialize it ahead of Java's serialization in the same file.
- Saish
"My karma ran over your dogma." - Anon

Similar Messages

Can't read all attribute of my serialized object

Hello everybody,
I've got a problem with my program. I try to serialized a MutableTreeNode root in order to save and then open my JTree.
I serialize it and i have no problem but when i open it the parent hierarchy is saved (x is son of y...) but their name are null. I loose nodes' name... :/
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                    //Je cr�e un fichier temporaire dans le r�p�rtoire courant
                    //Ce fichier est l'arbre (selection de l'utilisateur) serializ�
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Please check your Node Object, I mean all Objects that you are going to save is serialized or not.

[ORA-22905] How to read a field of an object inside another object?

Greetings,
I'm a student and in a current exercise we have to work with the Object Oriented Programming functionality of Oracle.
In the database we defined an object type, which is then considered inside another object type. The thing is, that I cannot read an attribute of the inner object. I've read tens of websites but none of them have helped so far. I've read the PL/SQL User Guide and Reference document also.
The inner object is defined as follows:
create type address_t as object (
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CREATE TYPE professor_t as OBJECT(
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First of all, with a simple testing SQL statement I can see the data inside the object professor, even the object address_t:
SELECT * FROM PROFESSORS WHERE CODE = 13;returns the following:
CODE    |         NAME      |       ADDRESS
13      |         JOHN     |       MYSCHEMA.ADDRESS_T('FIFTH AVENUE','NEW YORK',12345)The thing is, I want to read the field street of the object address (of type address_t) inside professor (of type professor_t).
I could see everywhere that the way to go is to use point notation, and I've seen examples about the command VALUE, but none of the following SQL statements work:
SELECT VALUE(ADDRESS.STREET) FROM(
SELECT CODE,P_NAME,ADDRESS FROM PROFESSORS WHERE CODE = 13);
SELECT ADDRESS.STREET FROM PROFESSORS WHERE CODE = 13;
SELECT PROFESSOR.ADDRESS.STREET FROM PROFESSORS WHERE CODE = 13;I'd really appreciate if someone could show me how to access the values of the field of the object inside an object.
Thanks in advance,
- David
Edited by: 858176 on May 11, 2011 6:53 PM Formatting

Great, this worked so far.
It is curious that you wrote 'profesores' but that is the actual name for the variable. I translated everything to english in order to post it here.
So, the statement is:
select value(t).DIRECCION.CIUDAD from profesores t;And It returned:
VALUE(T).DIRECCION.CIUDAD
Valencia
New York
TijuanaAnd, applying the VALUE command to the statement:
select codigo,
nombre,
value(t).DIRECCION.CALLE,
value(t).DIRECCION.CIUDAD,
value(t).DIRECCION.CP
from profesores T WHERE T.CODIGO = 13;Resulting in:
CODIGO                 NOMBRE                                             VALUE(T).DIRECCION.CALLE                           VALUE(T).DIRECCION.CIUDAD                          VALUE(T).DIRECCION.CP
13                     Pepito Pérez                                       Calle de los Rosales 0                           Valencia                                           46023                  That is EXACTLY what I needed.
Thanks Thomas, It was really helpful !
Edited by: 858176 on May 11, 2011 7:46 PM

Error: This item must be open to read this field while trying to access field of WI using Object Model

Hi there,
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WorkItem.Open() ?
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Creating a converter for old serialized objects

Hi,
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thanks a lot!

This might be of some help:
http://www.onjava.com/pub/a/onjava/excerpt/JavaRMI_10/?page=5

How to divide big serialized object in parts to be able to save as Blob typ

Hi,
Actually i have serialize a big XML document object and want to save in a field of type Blob. As Blob size is 64k. So if the serialized object is greater than 64k. It gives me error of size.Can anybody tell how to break large serialized objects.
I am using this code
File f = new File("out.ser");
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p.setBinaryStream(1, fin, f.length());
p.executeUpdate();
This code works fine if the size of out.ser file is less than 64k. But does not work for bigger sizes
Please help me out
Thanks

Read your data from the file into a byte array, then extract 64K at a time into a smaller byte array, and use a ByteArrayInputStream for updating the database.

Reducing Size of Serialized Object

Does anyone know how to crunch the size of the serialized object? My serialized objects are exceeding 20 megabytes and it's going to cost a lot of bandwidth transfers within our network.
Thanks. :-)

Make any fields transient that you can compute on the other side. If they're still too big after zipping them you may have to use another mechanism other then serialization: extract the minimum necessary data to create the objects and send it over using your own protocol.
I should note that most modems all ready do hardware compression so compressing it yourself may not improve performance much.

A General serialized object

Hi!
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Thanx
Jim D.

Just to clairify: The server doesn't have to do anything with the content of "data" apart from holding on to it, and pass it to another applet?
If that's the case substitute the Object in the "data" field for an array of bytes obtained by having the applet run the "Object" through ObjectOutputStream.
What's happening is that the server is deserializing the Packet when it arrives in the JVM of the server, when it comes across the "data" field it looks to see what class the instance really is, and fails as you dscribe if it doesn't have the class definition.

Losing field (in a Composit Object) in an HttpSession

Hello. I am losing fields in a Composite object (object tree) that I am storing inside of an HttpSession. I'm developing with Tomcat and I saw that Tomcat implements the put/getAttribute methods with a Hashtable.
So in my case, I store object A. in an HttpSession. For a user requests, I get A. and do some processing that sets object D. If I put that object back into the session and come back to it in a later request, object D has now been lost.
A
B
C
D
Is there some contract that I'm missing here? I don't think these objects (A - D) need to be serialized. What am I missing here?
Thanks in advance
Tim

It is very difficult to figure out what is going wrong from the info u have given. Examine your server log carefully if you can find any clue.
You may also write a listener implementing HttpSessionAttributeListener and implement the methods
attributeAdded(HttpSessionBindingEvent) ,attributeRemoved(HttpSessionBindingEvent) ,attributeReplaced(HttpSessionBindingEvent) to write some meaningful message in logs.
Track the message generated by attributeRemoved() method in particular to find out when exactly is your object D going out of session. May be that will give u some clue. You can use HttpSessionBindingEvent.getName() and
HttpSessionBindingEvent.getValue() methods to know about the object added/removed/reset in your session that has invoked the particular method in your listener.
Also you will need to register the listener class in your web.xml for that to work properly.
You will find more examples/help of this listener in net if u do a google search.

Bizarre ClassCastException when sending serialized objects

I have two programs communicating with each other over a network using TCP and serialized objects. One of the programs uses an ObjectOutputStream to send the message, and the other uses an ObjectInputStream to receive it. The receiver has a thread that simply loops, receiving and processing messages one at a time.
Under normal circumstances, this works fine. However, sometimes the sender program has to send more than one message, one right after the other. I guess my assumption was that on the receiving end, they would somehow just "queue up" in the ObjectInputStream and the receiver would be able to read them one at a time. But instead, I get this bizarre ClassCastException whose message talks about members and objects from both messages that were sent. It is as though somehow the two objects received are being mangled together and interpreted somehow as one object. This is strange to me, since I am pretty sure TCP is supposed to guarantee in-order delivery of packets.
Can I not send multiple messages right after each other through an ObjectOutputStream and have them received in an ObjectInputStream? If not, what would be a good workaround?
If you need more details, it works like this. I have two classes that look like this:
class Class1 extends SerializableSuperclass
Member1 m1;
class Class2 extends SerializableSuperclass
Member2 m2;
}Sender sends an instance of Class1 and then immediately an instance of Class2. Receiver attempts to readObject() from the input stream and gets this exception:
Exception in thread "Thread-4" java.lang.ClassCastException: cannot assign instance of Class2 to field Class1.m1 of type Member1 in instance Class1
Isn't that bizarre? Two separate classes, and it is attempting to merge the two in some odd way.
How do I fix or work around this?
Thanks

These classes do not have those methods. They are simply message classes designed to hold data. Do you need to see the methods that call ObjectOutputStream's writeObject() and ObjectInputStream's readObject() methods?
The serializable superclass is there because it has other stuff including a field identifying the sender. It's basically a base message class.
Also, the member classes are serializable (serializability isn't the issue anyway; "class cast" is the issue).

Static fields ARE being serialized

Hi there,
I wrote a small test class that serializes an object, writes the serialized object to file, read the serialized object from the file and then deserialize the object. The object being serialized contains normal fields, a transient field, and a few 4 static fields with varying access modifiers. For some reason the static variables ARE being serialized. From what I've read this should not happen, and for very good reasons.
Here is the object being serialized:
package serialization;
import java.io.Serializable;
import java.util.Formatter;
public class MySerializableObject implements Serializable {
     private static final long serialVersionUID = 1L;
     private int a = 1;
     private int b = 2;
     private transient int c = 3;
     static public int d = 4;
     static protected int e = 5;
     static private int f = 6;
     static int g = 7;
     @Override
     public String toString() {
          Formatter formatter = new Formatter();
          formatter.format("a=%1$s b=%2$s c=%3$s d=%4$s e=%5$s f=%6$s g=%7$s", a,b,c,d,e,f,g);
          return formatter.toString();
     public void setNewD(int newVal) {
          d = newVal;
}And here is the code that does the serialization:
package serialization;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class FileContentsObjectSerializer {
     File file;
     public FileContentsObjectSerializer(String name) {
          this.file = new File(name);
          if (this.file.exists()) {
               this.file.delete();
          try {
               this.file.createNewFile();
          } catch (IOException e) {
               e.printStackTrace();
     public void serialize(Object o) throws IOException {
          FileOutputStream fos = new FileOutputStream(this.file);
          ObjectOutputStream oos = new ObjectOutputStream(fos);
          oos.writeObject(o);
          oos.close();
          fos.close();
     public Object deserialize() throws IOException, ClassNotFoundException {
          FileInputStream fis = new FileInputStream(this.file);
          ObjectInputStream ois = new ObjectInputStream(fis);
          Object o = ois.readObject();
          fis.close();
          ois.close();
          return o;
     public static void main(String args[]) {
          MySerializableObject mso = new MySerializableObject();
          mso.setNewD(100);
          System.out.println("Object being serialized:"+mso.toString());
          FileContentsObjectSerializer ofs = new FileContentsObjectSerializer("c:/temptest.txt");
          try {
               ofs.serialize(mso);
               MySerializableObject result = (MySerializableObject) ofs.deserialize();
               System.out.println("Deserialized Object:    "+result.toString());
          } catch (Exception e) {
               e.printStackTrace();
}And here is the results I get:
Object being serialized:a=1 b=2 c=3 d=100 e=5 f=6 g=7
Deserialized Object:    a=1 b=2 c=0 d=100 e=5 f=6 g=7As you can see, both results are exactly the same, even though the setNewD value is not called on the deserialized object.
Any ideas?

You are misinterpreting the result. Try this main instead:
    public static void main(String args[]) {
        MySerializableObject mso = new MySerializableObject();
        mso.setNewD(100);
        System.out.println("Object being serialized:"+mso.toString());
        FileContentsObjectSerializer ofs = new FileContentsObjectSerializer("c:/temptest.txt");
        try {
            ofs.serialize(mso);
            mso.setNewD(-100); //a-oogah!
            MySerializableObject result = (MySerializableObject) ofs.deserialize();
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        } catch (Exception e) {
            e.printStackTrace();
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FileUpload problem: InputStream does not contain a serialized object

Hi All,
I'm using the FileUpload component in a JSPDynPage and the htmlb component seems to work fine but I cannot read the file (InputStream). I get the following error(IOException): "InputStream does not contain a serialized object".
Please let me know what is wrong with my code. This is a part of the code I used:
public FileInputStream sourceFileInput;
public ObjectInputStream input;
FileUpload fu;
fu = (FileUpload) this.getComponentByName("myFileUpload");
IFileParam fileParam = ((FileUpload) getComponentByName("myFileUpload")).getFile();
File f       = fileParam.getFile();
file         = fu.getFile().getFile();
absolutepath = fu.getFile().getFile().getAbsolutePath();
this.sourceFileInput = new FileInputStream(file);
input = new ObjectInputStream(sourceFileInput);
The last line of code seems to generate te error.

Hi,
I have found the answers, thank you both.
(I included the examle code. Perhaps of some use to someone.)
FileUpload fu;
fu = null;
fu = (FileUpload) this.getComponentByName("myFileUpload");
//       this is the temporary file
if (fu != null) {
     IFileParam fileParam = ((FileUpload) getComponentByName("myFileUpload")).getFile();
     if (fileParam != null) {
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          File f = fileParam.getFile();
          if (f != null) {
               try {
                    fis = new FileInputStream(f);
               // process exceptions opening files
               catch (FileNotFoundException ex) {
                    myBean.setMessage(
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               br = new BufferedReader(isr);
String textLine = "";
do {
     try {
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     } catch (IOException e) {
          myBean.setMessage(
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     // (I_FILE is the table with txt data that is sent to the RFC)
     I_FILE.appendRow();
     I_FILE.setValue(textLine, "REC");
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StreamCorruptedException: does not contain a serialized object?

Can someone tell me why am I getting this exception:
C:\javapr>java FetchObject
Couldn't retrieve binary data: java.io.StreamCorruptedException: InputStream
does not contain a serialized object
java.io.StreamCorruptedException: InputStream does
not contain a serialized object
at java.io.ObjectInputStream.readStreamHeader
(ObjectInputStream.java:849)
at java.io.ObjectInputStream.<init>
(ObjectInputStream.java:168)
at FetchObject.main(FetchObject.java:23)
import java.sql.*;
import java.util.*;
import java.io.*;
class FetchObject implements Serializable {
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     try
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          String sql = "SELECT id, rowdata FROM blobs WHERE id = " + id;
          ResultSet rs = stmt.executeQuery(sql);
          if ( rs.next() )
                       try
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                           BufferedInputStream bis = new BufferedInputStream( rs.getBinaryStream("rowdata") );
                       byte[] bindata = new byte[4096];
                           int bytesread = 0;
                           if ( !rs.wasNull() )
                                   if ( (bytesread = bis.read(bindata,0,bindata.length)) != -1 )
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                            returndata = baos.toByteArray();
                         baos.flush();
                            bis.close();
                   catch ( Exception ex )
                        System.err.println("Problem retrieving binary data: " + ex);
                    rs.close();
                     stmt.close();
           catch ( Exception ex )
                System.err.println("Couldn't retrieve binary data: " + ex);
        return returndata;
import java.io.*;
class Employee implements Serializable
     private String lastName;
     private String firstName;
     public Employee(String lastName, String firstName)
          this.lastName = lastName;
          this.firstName = firstName;
}

To clarify I have stored an Employee Object as a Blob in the Oracle database and am attempting to retreive the
Employee Object from this Blob.
Thanks

Field Validation on Read Only Field

I'm trying to create a pop up error box if a field contains null values. The problem is that the field I'm trying to do the validation on is a read-only field. It's the Account field on the Contact Object or Module. It won't allow me to include validation. The goal here is to have a POP UP ERROR box come up if someone does not select a value for that field. Making it required doesn't generate a popup box, it only has a small "required" text next to the field which can be easily missed by a user. Any ideas?

Hi !
I found the way to do what you wan't, but it sounds a bit strange for me...
You have to put a field validation on the Account Id field. I made some tests to know what is in the AccountId field when it's blank and i see that the value is "No Match Row Id" !!
So your validation rule must be simply
*<> "No Match Row Id"*
It worked for me, the error message appears... But I think this is something we have to report to Oracle...
Hope this will help, feel free to ask more !
Max

Java.io.StreamCorruptedException: InputStream does not contain a serialized object

          I have an applet which calls a JSP to write data object to the db and then the
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          is giving the following error. The data object is in a separate class which implements
          Serialized.
          Here's the code in the applet calling the JSP and the response from the JSP
          URL server = null;
          String urlConnectionString = "http://localhost:7001/isLoginValid.jsp";
          try
          server = new URL(urlConnectionString);
          catch(MalformedURLException e)
          System.out.println("URL exception: " + e );
          // send request
          ObjectInputStream response = null;
          Object result = null;
          try
          URLConnection conn = server.openConnection();
          conn.setDoOutput(true);
          conn.setUseCaches(false);
          conn.setRequestProperty("Content-Type", "application/octet-stream");
          ObjectOutputStream request = new ObjectOutputStream(new
          BufferedOutputStream(conn.getOutputStream()));
          request.writeObject((Object)dvo);
          request.flush();
          request.close();
          // get the result input stream
          response = new ObjectInputStream(new BufferedInputStream
          (conn.getInputStream()));
          // read response back from the server
          result = response.readObject();
          if( result!=null && (result instanceof DataVO))
          dvo = (DataVO)result;
          String vo = dvo.printDataVO();
          System.out.println("*DataVO*\n"+vo);
          else
          System.out.println("not an instanceof DataVO");
          catch(IOException ignored)
          System.out.println("Error in DataVO response");
          ignored.printStackTrace();
          Here's the code in the JSP sending the response back to the applet. The 'dvo'
          object is the object which is serialized and has gets and sets for the diff. data
          elements. When I print the 'dvo' before writing the object to outputStream it
          prints the correct values for the data element.
          // send response
          response.setStatus(HttpServletResponse.SC_OK);
          ObjectOutputStream outputStream = new ObjectOutputStream (new BufferedOutputStream
          (response.getOutputStream()));
          outputStream.writeObject(dvo);
          outputStream.flush();
          ERROR is as follows:
          Error in DataVO response
          java.io.StreamCorruptedException: InputStream does not contain a serialized object
          at java/io/ObjectInputStream.readStreamHeader
          at java/io/ObjectInputStream.<init>
          What am I doing wrong?. Please respond soon. The applet is run on IIS and the
          JSP in on weblogic 6.1. I'm not sure if that makes any difference.


          I have an applet which calls a JSP to write data object to the db and then the
          JSP sends back the updated data object. The writing part is ok but the response
          is giving the following error. The data object is in a separate class which implements
          Serialized.
          Here's the code in the applet calling the JSP and the response from the JSP
          URL server = null;
          String urlConnectionString = "http://localhost:7001/isLoginValid.jsp";
          try
          server = new URL(urlConnectionString);
          catch(MalformedURLException e)
          System.out.println("URL exception: " + e );
          // send request
          ObjectInputStream response = null;
          Object result = null;
          try
          URLConnection conn = server.openConnection();
          conn.setDoOutput(true);
          conn.setUseCaches(false);
          conn.setRequestProperty("Content-Type", "application/octet-stream");
          ObjectOutputStream request = new ObjectOutputStream(new
          BufferedOutputStream(conn.getOutputStream()));
          request.writeObject((Object)dvo);
          request.flush();
          request.close();
          // get the result input stream
          response = new ObjectInputStream(new BufferedInputStream
          (conn.getInputStream()));
          // read response back from the server
          result = response.readObject();
          if( result!=null && (result instanceof DataVO))
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          object is the object which is serialized and has gets and sets for the diff. data
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          ObjectOutputStream outputStream = new ObjectOutputStream (new BufferedOutputStream
          (response.getOutputStream()));
          outputStream.writeObject(dvo);
          outputStream.flush();
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          Error in DataVO response
          java.io.StreamCorruptedException: InputStream does not contain a serialized object
          at java/io/ObjectInputStream.readStreamHeader
          at java/io/ObjectInputStream.<init>
          What am I doing wrong?. Please respond soon. The applet is run on IIS and the
          JSP in on weblogic 6.1. I'm not sure if that makes any difference.

Read a field of a serialized object

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