object 2 « serialize « Java I/O Q&A





1. Encrypting a serialized object    coderanch.com

I have serialized a Vector object and stored it in a file. Now if the file is opened, the contents of the Vector are visible. Also anyone can deserialize the object. I want to encrypt the file so that the contents of the file are not visible and also the file cannot be deserialized by anyone but me. How do I ...

2. Object Serialization    coderanch.com

In my code I need to serialize a hastable and make it persistant. In the following code,before reading an object I need to check if the file is empty. Does anyone know how to do that? I tried checking the ObjectInputStream for null, but that doesnt work. Can anyone help? FileOutputStrem out=new FileOutputStream(s); ObjectOutputStream O=new ObjectOutputStream(out); FileInputStream in=new FileInputStream(s); ObjectInputStream I=new ...

3. Reading all serialized objects from a file    coderanch.com

I see plenty of sample codes that all look similar this... import java.io.*; import java.util.*; import java.lang.*; // Reading an Object from a stream. // Deserialize a String and date from a file. public class ReadSerializedObject implements Serializable { public static void main (String[] args) throws IOException,ClassNotFoundException { FileInputStream in = new FileInputStream("tmp"); ObjectInputStream s = new ObjectInputStream(in); AnObject = (AnOnbject)s.readObject(); ...

4. Serialization of an Object Without Using ObjectStreams    coderanch.com

I am new to serialization. I have been asked to serialize an object using FileWriter. I am to create a String from the Object and write it with FileWriter. The Object is a Vector with an element that is a class with two data members. The data members are an int and a String. What is the best way to do ...

6. Ensure an object can be serialized safely    coderanch.com

Implementing Serializable will tell you if an individual object can be serialized, but unfortunately, it's possible that that object has non-serializable members or member containers that contain non-serializable objects. I think actually serializing the object is the only way to say for sure. Serializing to a ByteArrayOutputStream and watching for exceptions would be the way I'd test this in JUnit.

7. storing a serialized object in a String?    coderanch.com

Hi, I would like to deserialize an object and store its value as a String. This string is stored in an XML document and will need to be converted into an object on the receiver side which the xml document is sent to. I have tried using the ByteArrayOutputStream class to obtain a byte array of the object and converting that ...

8. serialize object    coderanch.com

Im very new to this, so Im having a hard time trying to serialize an Object containing a hashtable. CAn anyone point me in the right direction. I tried to get going with suns serialize tutorial buts its only confusing me. It's easy to serialize any object, no matter what it contains. You just have to implement the Serializable interface to ...

9. Basic Object Serialization Questions    coderanch.com

What is the proper syntax to for read an object that has been serialized? (After the ObjectInputStream has been set-up.) Does it look anything like this?: MyClass MyObject = objStream.readObject(ObjectIWantToRead) Thanks for any information, Landon [ March 11, 2004: Message edited by: Landon Blake ] [ March 11, 2004: Message edited by: Landon Blake ]





10. Basic Object Serialization Question    coderanch.com

11. How can we append/retrieve serialized objects to/from a file?    coderanch.com

I have few objects in Hashtable. I wrote the Hashtable (Serialized object) to a file. Again I executed the program and added different set of list to Hashtable and the new hashtable is appended to the same file. Now If i try to retrieve to those serialized objects, I am getting "EOFException (End of File Exception): Expecting code". It is printing ...

12. Object serialization and pooling    coderanch.com

Hi all, I use a simple object pool for object reuse. The objects in this pool are later serializaed to network clients. The problem is that the default serialization mechanism will not serialize an object twice, even if it changed between two subseqent calls to ObjectOutputStream.writeObject(). This is because it uses the object's identity hash code to determine wheteher or not ...

13. Appending to a file containing serialized Objects?    coderanch.com

Consider the code segment : FileOutputStream fos = null; ObjectOutputStream oos = null; try { fos = new FileOutputStream("students-objects.txt", true); //always append oos = new ObjectOutputStream(fos); for(int i = 0; i < list.size(); i++ ) { oos.writeObject(list.get(i); } oos.flush(); } catch (IOException io) { io.printStackTrace(); } finally { try { if (oos != null) oos.close(); if (fos != null) fos.close(); } ...

15. Reading multiple object serialization    coderanch.com

Hello, I am using object serialization to write objects to a file. Since I have lots of objects of the same type, I use a for loop: try { FileOutputStream fos = new FileOutputStream("test"); ObjectOutputStream oos = new ObjectOutputStream(fos); for(Appointment appt : appointments) { oos.writeObject(appt.getDate()); oos.writeObject(appt.getDescription()); } oos.flush(); oos.close(); fos.close(); } catch(IOException e) { e.printStackTrace(); } This works fine, but how ...

16. reading delimited gzipped serialized objects    coderanch.com

Hi all, Hoping someone might help me get my head around the reading of a data file. the strucutre of file begins with a 100 byte header. after that there is a 0L delimter (8 bytes of 0) followed by a set of gzipped/serialised objects followed by the delimiter, then again followed by more gzipped/serialised objects and a delimiter at the ...





17. what exactly are stored while serializing a object ?    coderanch.com

The doc on serializable is pretty good about what works and what doesn't. I wouldn't attempt to reproduce all the rules here. But you did hit one good point - transient variables are not serialized by default. You can override readObject and writeObject to override the default rules, making just about anything possible.

18. Non serializable objects    coderanch.com

I am working on a java project and I have to serialize a class (created by me) which has many references to other classes that should be serialized too. I add the marker "implements serializable" to all the necessary classes, but when I run I get a non serializable exception. Maybe one ore more objects are non serializable, but how do ...

19. Problems with my object serialization    coderanch.com

Hi everyone, Im trying to store an arraylist by serializing it. The problem is, that it wont work, im getting the not serializable exception: java.io.NotSerializableException: ImageResults at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.writeObject(Unknown Source) at java.util.ArrayList.writeObject(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source) Is there any way around this? do i need to serialize ...

20. serialization for class Object references    coderanch.com

I have written a simple program,but it has thrown exception. import java.io.*; import java.util.*; class A implements Serializable { B b=new B(); } class B { } public class SerialTest { /** Creates a new instance of SerialTest */ public static void main(String[] args) throws IOException { FileOutputStream of=new FileOutputStream("C:\\deploy\\pbnm\\class\\src\\s.txt"); ObjectOutputStream out=new ObjectOutputStream(of); out.writeObject(new A()); } } error ----- Exception in ...

22. After serialize a object what will be the value of reference object and primitive    coderanch.com

After serialize a particular object what will the value its object references and primitives ??? please go through the following scenario import java.io.*; class Dog implements Serializable{ String dogString = "haiHai"; int dogSize = 555; public String toString(){ return "This is Object Man"; } } class MyTestSerial{ Dog d = new Dog(); MyTestSerial(){ try{ System.out.println("Before Serialization Dog object is : " ...

23. What serialized object looks like?    coderanch.com

Are you examining intercepts ? - If so, better move to security. For most traffic, anything in the url other than abcd... and 0-9 pretty much gets encoded by replacing the ascii char with % followed by a two character encoding which is read as it's hex encoding of the numeric ascii value. In POST method, base64 encoding ( which is ...

24. How to interpret a Serialized Object ?    coderanch.com

The format of serialized Java objects is binary, so I doubt that you'll be able to make much sense of it by looking at it. It's possible to write code that interprets serialized Java objects in some language other than Java. The source of the java.io.ObjectInputStream and ObjectOutputStream classes has all the information about what the format looks like. Is that ...

25. Serializing an Object in Java ? How do i reuse it the object and where can i !    coderanch.com

hai friends ! i am getting the output to the code which i am going to stated below but where do i exactly find the object and how come i re-use it ! Code: import java.io.*; public class SerializingObject{ public static void main(String[] args) throws IOException{ BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); System.out.print("Please enter File name : "); String file = ...

26. About Object Serialization (Confusion)    coderanch.com

Serialization doesn't write data, it writes objects. What gets written to your stream are two references to the same object. The second reference will not include the object's member data, because the serialization mechanism remembers which objects have already been written out, and by default won't write their data a second time, even if that data has changed. If an object ...

27. Serializable objects ?    coderanch.com

1. What's exactly serializable objects ? What kind of objects can be serializable objects ? It just sounds bit abstarct idea for me, can you help with concrete example so as if I can "see" what's going on. 2. If I create my own data structure, how do I know if it is serializable or not ? thanks.

28. Q on object serialization    coderanch.com

I'm imagining one. The "value" variable is defined in the super class A. Would that be an issue? I feel comfortable with following: class A implements java.io.Serializable { String value; public A() { value = A Value; } } class B extends A { public B() { value = B Value; } } But I do not have the control on ...

29. Object Serialization    coderanch.com

I have a java code which creates an object for a class. Now I have another instance of the same application where I need the object created during the first instance. I tried to use Object Serialization but the object which I try to Serialize is not Serializable [It is a third party lib and I can't change the source]. Is ...

30. Finding the size of a serialized java object using core java    coderanch.com

I don't know of any easy way to find out how much memory an object in memory uses in Java. It is not in the standard API. If you really want to know, there might be a way using the debugger APIs, but it won't be easy. Note that the amount of memory an object occupies is implementation dependent - it ...

31. related to serialization( reading the object in serialization is found difficult)    coderanch.com

Hello javaranchers/friends I want to write any number(say five) Customer object to file c:\\a\\sampleDB.dat I also read all objects back from the same file I can achieve it using serialization I also want to read on search criteria basis like id or name I find reading difficult need solution Customer object is as follows; public class Customer implements serializable{ private int ...

32. Not serializable objects    coderanch.com

Hello, I am having trouble saving objects into a blob. I get the NotSerializableException. From what I have gathered, the object I am trying to save cannot be serialized. I also cannot serialize it since it is an automatically generated object from an SDK i have no control over. What I am trying to do is find a workaround on how ...

33. How to read/resolve a serialized object?    coderanch.com

I created two methods to read/write serialized objects. The basic code for the read is shown below. Initially, both methods worked fine when contained in a class in the same Eclipse project as the class objects I was serializing. However, since it is generic code, I attempted to move the code to a separate utility project. The read code now fails ...

34. Can we find the code which makes the object serializable?    coderanch.com

Hi, Welcome to JavaRanch! A class implements Serializable to signal to the JVM that it's OK to serialize objects of this class. The code that actually does the serialization is part of the ObjectOutputStream class -- some of it is Java, and some of it may be native code (I don't remember; it's been a while since I looked.) But in ...

35. Incompatibility problems when altering serialized objects    coderanch.com

I'm working on a hobby project that is alot bigger than my previous work, and the complexity of the program is teaching me alot. I have now met an issue that I don't see any easy way to pass, and I would like to know how this works in the world of professional programming. Alittle on my program: My program has ...

36. GC behavior on Serializable objects    coderanch.com

Hi Ranchers, I am trying to fix the performance problems in my application. 1. How does a serializable object serialized. When I profiled the application, I never see this object GCd. I use sweetdev ria tree in my application. On every refresh of my JSP page, increases new objects which ...

37. Serializing objects    coderanch.com

38. Object & Serializable    coderanch.com

The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ...

39. Writing serialized objects to files    coderanch.com

40. Object Serialization!    coderanch.com

To be able to send an object to any type of stream the object must be serialized. Serializing an object pretty much packs it up so that it can be used again elsewhere. One example would be you can save a serialized object that contains settings to a file when your program exits and next time you run your program you ...

41. What is object serialization?    coderanch.com

To be real picky, I'd separate serialization issues from persistence and files. It just turns an object into a string or stream of bytes. Nearly anything can be done with the serialized data. For example, the same terms are used in sending an object "over the wire" in a distributed application. The sender serializes the object to a stream and the ...

42. serialized object - can multiple programs use it?    coderanch.com

If you have a java program running on one operating system somewhere and remotely have another java program running on another operating system - can you create a serialized object with program1, send it somewhere (ftp for example) to program2 and have program2 deserialize it and use that object (assuming the code includes the same class, etc). Or, is a serialized ...

43. Object Serialization    coderanch.com

hi all, i'm trying acheive a simple task : 1 - Create one (or many) custom object(s) 2 - Save them to a file 3 - Read the objects from the file 1 - i created a class called "Client" that implements Serializable 2 - here's the way i thought of saving these object : use an ArrayList (clients) to store ...

44. Update Serializable Object    coderanch.com

I have provided a sample code to serialize and deserialize. import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable; class Car implements Serializable { private static final long serialVersionUID = 1L; private String name; public Car(String name){ this.name=name; } String getName(){ return this.name; } } public class Test { static final String fileName="a.txt"; public ...

45. deleting a class value from a serialized object    coderanch.com

Suppose I have a class like this: class Dog implements Serializable{ int size; boolean chasesCars; String name; static final long serialversionUID = 463683736; // or something like that } Then I serialize the object. Then I add other class values to Dog: char inishal; int weight; ArrayList listOfFoodEaten; Then I read in the serialized object. I've done this before several times, ...

46. How to create object as Serializable?    coderanch.com

47. Reading\writing serialized objects via Readable    coderanch.com

Im working on a task where I need to save and load object information to file. The format in the file does not matter, so it doesnt matter exactly how I save\load it. However, I am required to use the method 'read ( Readable arg0, Readable arg1 )' to write the file, and 'write ( PrintStream arg0, PrintStream arg1 )' to ...

48. serialization: object casting doubt    coderanch.com

i was reading the code below: import java.io.*; public class SerializationDemo { public static void main(String args[]) { // Object serialization try { MyClass object1 = new MyClass("Hello", -7, 2.7e10); System.out.println("object1: " + object1); FileOutputStream fos = new FileOutputStream("serial"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(object1); oos.flush(); oos.close(); } catch(Exception e) { System.out.println("Exception during serialization: " + e); System.exit(0); } // Object ...

49. Not able to serialize java object    coderanch.com

Hi, I want save one java object directly into database, for that i have serialize it and i am able to save the java object into database. But when i included reference of one object in my class which is not serialized, it start giving error: NotSerializableException. My main class is serialized, is it necessary that all other object reference which ...

50. java object serialization    coderanch.com

51. Serialize an object that contains non-serializable objects    coderanch.com

How do i serialize an object - that in turn contains non-serializable objects within it. I have a List object that in turn contains a Map object. I tried converting the List object to byte[] and re-converted the byte[] to List object. The content of the map is returned as null. Would appreciate if i could get some help on this. ...

52. Best way to serialize an object?    coderanch.com

I have an object (see below) that I want to write to a file. The object resides in an array, so I need to dump the entire array to a file, the read it back in in another application. public Application ( String aSoftware, String aVersion, String aManufacturer, String aSerialNumber, String aRegistration, String aPassword, String aEmail, String aWebsite, String aPhone ) ...

53. Object serialization    coderanch.com

54. Serialized object size issue    coderanch.com

55. serializable object    coderanch.com

I have a few beans... I need to persist data in DB,DML,Serializable object. I did that for DB,XML but what should be done for Serializable object... What is so different in it and how different it is from a normal object/bean??? can anybody throw an example as such or some insight as to what i should do?

56. Serializable Object...    coderanch.com

57. Object Transformer serialize problem    coderanch.com

Hello I have a Java application which has a little method to serialize a javax.xml.transform.Transformer into a byte[]. Here is the method: ... Object obj = transformer; ByteArrayOutputStream bos = new ByteArrayOutputStream() ; ObjectOutput out = new ObjectOutputStream(bos); out.writeObject(obj); out.close(); // Get the bytes of the serialized object byte[] buf = bos.toByteArray(); ... However, I am getting the following error: java.io.NotSerializableException: ...

58. Writing/Reading multiple objects of same class using Serialization?    coderanch.com

How to write and read multiple objects using serialization? The code that I am using to serialize and deserialize is listed below. During the deserialization process ois.isAvailable!=0 is giving false. Can multiple objects be serialized and deserialized in this way? public static void add(Product product, String filePath) throws IOException{ ObjectOutputStream oos = null; File file = new File(filePath); try{ oos = ...

59. Receiving Serialized Object : Unmatched (Package) Type    coderanch.com

Problem: in.readObject() throws a ClassNotFoundException exception because it can't find the class a.package.path.CommandMessage. I'm sending a serialized object via socket; using writeObject(), readObject(). There are now two versions of the same system that are communicating with one another; one prototype version in which no packages were defined, and a newer version in which classes have been moved into packages. I am ...

60. Serialized object or Remote object ?    coderanch.com

hello all, i m trying to create a framework for creating distributed applications, i wanted to decouple server functionality like registering/join, unregister the clients and application functionality like for the game logic, in two different remote objects. i m also declaring the callback remote object which has the only the update method, which is implemented by the clients to get updated ...

61. serialize object    coderanch.com

Serializing an object means converting it to a stream of bytes that you can later convert back to a Java object (deserializing). You can do anything with that stream of bytes you like: store it in a file on disk, or transmit them across a network, etc. "Serialize across a network" means: serializing an object (converting it into a stream of ...

62. Serializable domain objects    coderanch.com

It is often for scalability. You put the Objects into a Context, and they hang around for a while. As your server starts to get more hits, it will eat up more memory. Since not all the Objects that were created are in active use, then some of them can be Serialized to disk to get them out of RAM, and ...

63. Serialize object    coderanch.com

Hi guys i am having some trouble reading a serialized object. I wrote some code to store login details, i had the serializing and reading of this information working but needed to change my approach. I have changed my code as to store the login info as an object, instead of storing each variable individually. My code for serializing seems to ...

64. Best way to serialize java object    coderanch.com

In my application I am using Java default Object serialization to transfer object from one JVM to the other. The object transfer is through tcp socket. As the object size is really huge (there are multiple data-structures like ArrayList, HashMap and so on ), the object serialization, object transfer through tcp socket and de-serialization taking relatively huge time. To solve this ...

65. Object Serialization Process?    coderanch.com

Object serialization is the process of saving an object's state to a sequence of bytes. Does it saves only the instance variable or also the object methods(like getter and setter methods) ? Once we we write the object to outputstream or some text file how does it get transmitted over network? Do we write the object in a text file right? ...

66. Object serialization    java-forums.org

public class Test implements Serializable { public int number; private Serialization s; public Test(Serialization s) { this.s = s; number = 4; } public void write(String fileName) { try { ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(fileName)); out.writeObject(this); out.close(); } catch (IOException e) { System.out.println("Error!"); } } public Test read(String fileName) { Test object=null; try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName)); ...

67. Serialization example, reading the data back into the object    java-forums.org

I'm trying to create a class which can store its data in a serialized format to disk, and then load the serialized data back into itself. I have an incomplete code here: Java Code: package example; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable; public class Test implements Serializable { private static int[] items = ...

68. Serializing objects    java-forums.org

package jukebox; import java.util.ArrayList; import java.io.*; public class StorageSystem implements Serializable { ArrayList itemList = new ArrayList(); // sets up an array list private int totalStored; // keeps track of the number of stored items public StorageSystem(int totalStored) // constructor, gets set to 0 { this.totalStored = totalStored; } public void addItem(Item hold) // adds object to the ArrayList { itemList.add(hold); ...

69. Serializing and deserailizing an object    java-forums.org

Can someone tell me whats wrong with my code? i get these errors when i run. Java Code: Errorjava.io.NotSerializableException: OptionSet$Option Errorjava.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: OptionSet$Option Exception in thread "main" java.lang.NullPointerException at Driver.main(Driver.java:15) I guess something went wrong while trying to serialize my OptionSet class but i have no idea how to fix it. Here is my full project. Driver: Java Code: ...

70. Object not serializing    forums.oracle.com

Hard to say, since you didn't show any code where you set anything to non-null, and you didn't show any code where you serialize or deserialize anything. Produce and [SSCCE|http://mindprod.com/jgloss/sscce.html] that shows more completely what you're doing. Note that the first S stands for "Short". Just one or two Strings in your config class will be enough to demonstrate what you're ...

71. Read/ Write objects that are not serializable    forums.oracle.com

Hello, I am working on a project with a tabbed pane. I create three panels and create a tab for each panel. I am using the jgoodies forms 1.0.7. These do not support the serializable interface. I need to save all the data the user inputs in these three tabs. I was thinking it would be easiest just to write the ...

72. Question about updating a file with serialized objects.    forums.oracle.com

I was wanting to write objects into a file instead of plain text but im unsure about how to update the file. Im thinking that since their objects I should be able to just overwrite a previous object with an updated or new object right? Of course provided that the objects are from the same class lets say class testobject.

73. Serializable Object - pass-by-reference or pass-by-value?    forums.oracle.com

Hello all, Apologies if I am missed the answer in some other thread, but I couldn't a straight answer for this one. I have a class called Configuration which is a Java Bean and implements Serializable. This class, as the name suggests, holds all the user editable values in a Licence Plate Recognition Application. I create an instance of Configuration and ...

74. Objects and Serialization    forums.oracle.com

i need the list of usernames on this Hashtable on the other side. How ever Instead of sending the Hashtable, i just iterated over the usernames using Enumator, and entered the list of usernames to a String array. i sent this string array using the objectoutputstream but: You know you said open a socket. The thing is i've already got a ...

75. How do I omit an object when serializing?    forums.oracle.com

I want to serialize a class that has an object of a class that has an AudioClip object in it and Java is not letting me serialize it. I think there is a way to tell the output stream to skip an object in a class but I can't remember how and I can't find much help online. Can someone help ...

76. Unable to serialize object    forums.oracle.com

Hi, i was trying to connect a swing application and a servlet.I tried to pass the data between the two applications using ObjectOutputStream. The following steps a followed : 1. swing application is launched,it cretaes a connection with servlet and reads the data using ObjectInputstream. 2. Now the data is modified and i need to send this data to servlet using ...

77. I have a question about Object Serialize    forums.oracle.com

78. how to serialize an Object?    forums.oracle.com

If you do not have a handle to the DpFpTemplate class, you can make that transient in your class. Also you can make your code externalizable and handle serialization in a custom way and bypass serialization of DpFpTemplate class. But in both cases if you are intending to serialize DpFpTemplate data also that would not happen Hope this helps Thanks Aviroop ...

79. using serialization to save objects .    forums.oracle.com

/** * This also creates a Word Object * but allows the user to supply the Word and Language and the score. *

* Algorithm:
* 1. First string passed in parameter set to word.
* 2. Second string passed in parameter set to language.
* 3. third starting passes in parameter to set the score
* @param String set ...

80. Suggestions for removing serialized object instance    forums.oracle.com

Esentially I am building out a train ticket booking system for college and I have a data file that contains an Arraylist of bookings (class Booking is serializable). Every once in a while I want to purge old bookings and delete them from the file. So I suppose I could read the arrayList back into memory, remove any old bookings and ...

81. Can serialize SOAPMessage object ?    forums.oracle.com

http://msdn.microsoft.com/en-us/library/d5wt2he6%28VS.71%29.aspx Atleast google a little bit on SOAP and serialization. This is how SOAP messages are serialized Serialization of a SOAP message When sending a SOAP message using the MIME Multipart/Related Serialization, the SOAP envelope Infoset is serialized as specified in [XML-binary Optimized Packaging] 3.1 Creating XOP packages. Specifically: * The content-type of the outer package MUST be multipart/related. * The ...

82. Adding, Removing, Retrieving Specific Serialized Objects from File    forums.oracle.com

Hi, I am currently working on a program that needs to store a series of objects into a file, and need to be able to retrieve a certain specific object from the file. I will illustrate further with the following example. I have a class Student, containing attributes of ID Number, Name, DOB, and Course. I would need to add 10 ...

83. Error Reading/Writing Serialized object file    forums.oracle.com

run: Hello, Welcome to my Banking System Please choose a mode 1. ATM Mode 2. Teller Mode 99. Exit 2 Please make a selection from the menu. 1. Deposit 2. Withraw 3. Transfer 4. Display 5. Create a new Account 99. Exit 5 Please enter your name stefan Please enter your PIN_number 1234 Have a nice day!!! Please make a selection ...

84. changing a package structure whith existing serialized objects    forums.oracle.com

You have a thoroughly predictable disaster on your hands. Find the original developers and their management and make them fix it. Or have them taken out and shot. There is very little you can do about this problem without a massive amount of work. You are going to have to deserialize all the old data using the old non-packaged classes and ...

85. Object Serialization    forums.oracle.com

When I run my program I deserialize a serialized object into java program, after updating this object, it needs to be serialized again, however It takes way too long (around 8min). The file am reading/updating contains 200 000+ word forms (text only). My question: what is the best way to solve this issue to ensure quick updating rather than waiting 8min? ...

86. Serializing an Object to a String instead of a File    forums.oracle.com

Hey, I'd like to serialize an object to an SQL database using JDBC. With the structure of the database, it would be much easier to serialize the object to a String and then upload the String to the database. However, I've only found ways to serialize objects to File objects. It seems like the File is just going to be a ...

87. How to maintain references across multiple serializable objects?    forums.oracle.com

The general idea is that I have a "Cycle" object which stores a list of "Reaction" objects. Multiple Cycle objects reference to the same Reaction objects, but when I save them I'm guessing that after loading them back from file the Reaction objects will be duplicated, one version for each Cycle object it's in. Is there a way to somehow maintain ...

88. how to serialize an object with only DataInput and DataOutput given?    forums.oracle.com

Hello, i am facing a challenge here. I need to serialize/deserialize an object which is already made serializable. However, I am only given DataInput and DataOutput (defined by the Interface). How do I serialize/deserialize through them? I can't seem to be able to make the connection from DataInput/DataOutput to ObjectInputStream/ObjectOutputStream. Any help would be appreciated. Thanks.

89. Testing Object Equality using Serialization    forums.oracle.com

Hi, Thanks for the prompt reply! This was an avenue we wanted to explore as our existing framework makes it difficult to compare objects otherwise (we have a bunch of aggregation/composition/backreferences and cyclic references that need to be handled by this framework). We were using a custom toString that used our framework to walk to object model before, but this proved ...

90. After serialize a object what will be the value of reference and primitive    forums.oracle.com

After serialize a particular object what will the value its object references and primitives ??? please go through the following scenario import java.io.*; class Dog implements Serializable{ String dogString = "haiHai"; int dogSize = 555; public String toString(){ return "This is Object Man"; } } class MyTestSerial { Dog d = new Dog(); MyTestSerial(){ try{ System.out.println("Before Serialization Dog object is : ...

91. serializing an object    forums.oracle.com

hello, im trying to serialize an object, but i keep getting IO errors. The original source of these was the my object to be serialised had a reference to another object which hadnt implemented the serializable interface, now the IO error .getMessage() returns sun.awt.image.ToolkitImage as where the error is originating. Now one object does have an image field and that image ...

92. Reading multiple serialized objects problem (StreamCorruptedException)    forums.oracle.com

Recipes already exist, loading used ingredients into mem... Existing recipe: Recipe(kj,Ingredient(kj,8.0,dfs)) java.io.StreamCorruptedException: invalid type code: AC at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1356) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at javaapplication1.GUI.jButton2ActionPerformed(GUI.java:180) at javaapplication1.GUI.access$200(GUI.java:17) at javaapplication1.GUI$3.actionPerformed(GUI.java:96) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6038) at javax.swing.JComponent.processMouseEvent(JComponent.java:3265) at java.awt.Component.processEvent(Component.java:5803) at java.awt.Container.processEvent(Container.java:2058) at java.awt.Component.dispatchEventImpl(Component.java:4410) at java.awt.Container.dispatchEventImpl(Container.java:2116) at java.awt.Component.dispatchEvent(Component.java:4240) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916) at java.awt.Container.dispatchEventImpl(Container.java:2102) at ...

93. Object Serialization? Keeping State after program is finished    forums.oracle.com

Hi, I recently passed the SJCP, and decided to take my new found "authority" and build a simple Swing app. Basically something small which will hit many of the areas I have been working on for the last few years. My big question before I get started involves how one keeps "state" after the program has completed running. A simple example, ...

94. Problem with I/O of serialized objects - Memory allotment too small?    forums.oracle.com

Hi, Can anyone help me with a serialized file I created. Basically it is a bunch of serializable objects stored in a vector. Then the whole thing is serialized and saved as a seperate file. Here is the io error message I get when I try to read it. "Exception during deserializaton: java.io.EOFException" I suspect the file is now too large ...

95. Large object serialization    forums.oracle.com

This entry was posted in the Serialization forum but since no one has answered it there I will give it another shot here. Dear All, I am trying to serialize a HashMap containing Strings as keys and and ArrayLists as values. This works fine when the number of entries is small, but does not work when the number of entries are ...

96. Serialize an Object    forums.oracle.com

have an Automotive class which has the following methods. Iam able to read the i/p file and print the o/p in another file. But when iam trying to serialize the Automotive class a .dat file is created but the o/p is not printed. Can we do the serialize the Automotive object in the same class as i have done below?????????? Or ...

97. Object Serialization, not working on different Systems.. Strange!!!!    forums.oracle.com

If i keep my server,client and Myclass under the same project and run the server and connect to it using the client and write the MyClass Object, the object is read by the server. Now i moved Client and MyClass to another Project. and Server and MyClass is another Project. My IDE is Netbeans. I started the server, connected to it ...

98. Unable to serialize object    forums.oracle.com

Hi, i was trying to connect a swing application and a servlet.I tried to pass the data between the two applications using ObjectOutputStream. The following steps a followed : 1. swing application is launched,it cretaes a connection with servlet and reads the data using ObjectInputstream. 2. Now the data is modified and i need to send this data to servlet using ...

99. object Serialization problem    forums.oracle.com

I have a class like this: public class A implements Serializable { String str = "Param"; public void setStr(String str){ this.str = str; } public String getStr(){ return str; } } The object of this class is written in the file. Can you please write few more lines on how java version affects object serialization.

100. regarding replacing serialized objects in a file    forums.oracle.com

hello all, i have some serialized objects of a class written into a binary file, the format is something like header1Object1header2Object2header3Object3............so on i am extracting all the objects into an arrayList, do some modifications and again serialize them back to the file. however i may need to do the re-writing many time, and this may cause some performance issues (the serialized ...