Help reg. serialization compatibility

Hi,
We developed a web-application using J2SE 5.0. It runs in IBM Websphere 6.1(with IBM JRE 5.0). We have an applet for rendering our reports. The applet communicates with the web-application to obtain serialized form of the data that needs to be rendered in the applet. The browser in the customers' site runs jre 1.3.0 as they use other applications that depend upon it. Hence, we migrated the applet to run with jre1.3. This seems to work fine.
My question is how does jre1.3 able to deserialize the data generated by IBM jre 1.5? Is this a mere coincidence? Are there any issues to be noted while deserializing the data generated by a newer version of jre, using an older version?
The serialized data that I had mentioned is generated by a third-party library. Also, our applet is a wrapper around the third-party applet. So, I have no idea as to what kind of data is being exchanged between the servlet and the applet.
Thanks in advance..

The wire protocol for Serialization has not changed since Java 1.1 and the most of the base class library code that is serialization has serialversionUID set and is backward compatible. Therefore older version of JDK can communicate with newer version of the JDK. The only exception to this is Swing components - in the JavaDoc it has been documented that serialised Swing data is only suitable for short term storage or RMI between application.
Most of the problem you would encounter with serialization between JDK release is actually in the application code. If you have forgot to set serialVersionUID then the JDK will generate one for you using the default field hashing algorithm in serialization library at runtime. This changes from release to release and therefore would break between the release. Therefore, always remember to put serialVersionUID in any classes that can be serialised in your application.

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Help reg Product Compatibility

HI All,
I need a small help regarding the compatibility of the follwing components on AIX 5.2 Operating System.
1)Oracle 9.2.0.4
2)SAP WAS 6.40 SP13
3)SAP Enterprise Portal software 6.0 SP 13
4)KM & Collaboration SP 13
5)TREX 6.1 SP13
Does the above product compostion represent a stable environment ??
Is SP 13 is a stable version ? Has it been released for customers??
or Its better to go for SP12 only !!
Waiting for your replies!!!
Best Regards,sandip

Hi Jochen ,
Thanks for your reply.
For the TREX, we wil be installing it on a separate box.
so, shall i go ahead with this configuration ??
Regards,sandip
Which version of NDS i need to go for ,12 or 13 ??
Regards,sandip
Message was edited by: Sandip Agarwal

JDK 1.5 Serialization Compatibility with assert()

I have the following class:
class xyz implements java.io.Serializable {
 void doNothing() {
 int x = 0;
 assert x < 5;
}If I compile it on both JDK 1.4 (with -source=1.4) and 1.5 (with -source=1.5) platforms, the serialVersion IDs are different. If I comment out the assert statement, the serialVersion on 1.5 platform changes to be the same as the 1.4. If I rebuild the 1.4 with the assert commented out, the serialVersionID does not change.
Am I missing something here? I have code that needs to be compatible between these versions, but it now seems that the use of assert (other than the statment "assert true") built with 1.5 effects the serialization ID.

Sure, I can define my own version, but the point is that I've got many fielded classes that have not changed, but now will fail serialization when comunicating with the new system simply because of the use of assertions with 1.5.
It looks like I will be forced to either go back to 1.4, test all classes for serialization compatibility with 1.4, or remove the asserts from the code.
In any case, it does not make sence to me why adding an assertion should change the serialVersionUID of a class in the first place when compiling under 1.5 and not under 1.4.

Help Needed: Serialization Problem

I've got a problem with serialization, which is better illustrated with an example (slightly modified version of example in Tech Tips, February 29, 2000, Serialization in the Real World. The problem is that comparing serialized static final fields doesn't return correct result. Any help on how to fix this problem would be greatly appreciated. Thanks in advance. Here is the code:
====================
import java.io.*;
class Gender implements Serializable {
String val;
private Gender(String v) {
val = v;
public static final Gender male = new Gender("male");
public static final Gender female = new Gender("female");
public String toString() {
return val;
public class Person implements Serializable {
public String firstName;
public String lastName;
private String password;
transient Thread worker;
public Gender gender;
public Person(String firstName,
String lastName,
String password,
Gender gender) {
this.firstName = firstName;
this.lastName = lastName;
this.password = password;
this.gender = gender;
public boolean isMale() {
return gender == Gender.male;
public boolean isFemale() {
return gender == Gender.female;
public String toString() {
return new String(firstName + " " + lastName);
public static void main(String [] args) {
Person p = new Person("Fred", "Wesley", "cantguessthis", Gender.male);
//-NOTE: there ia no problem with this check
if (p.isMale()) {
System.out.println("a male: " + p);
} else if (p.isFemale()) {
System.out.println("a female: " + p);
} else System.out.println("strange");
class WritePerson {
public static void main(String [] args) {
Person p = new Person("Fred", "Wesley", "cantguessthis", Gender.male);
ObjectOutputStream oos = null;
try {
oos = new ObjectOutputStream(
new FileOutputStream(
"Person.ser"));
oos.writeObject(p);
catch (Exception e) {
e.printStackTrace();
finally {
if (oos != null) {
try {oos.flush();}
catch (IOException ioe) {}
try {oos.close();}
catch (IOException ioe) {}
class ReadPerson {
public static void main(String [] args) {
ObjectInputStream ois = null;
try {
ois = new ObjectInputStream(
new FileInputStream(
"Person.ser"));
Person p = (Person)ois.readObject();
//-NOTE: this is the problem: the check returns false
if (p.isMale()) {
System.out.println("a male: " + p);
} else if (p.isFemale()) {
System.out.println("a female " + p);
} else System.out.println("strange");
catch (Exception e) {
e.printStackTrace();
finally {
if (ois != null) {
try {ois.close();}
catch (IOException ioe) {}
}

The Gender class implements a type-safe enumeration, but its implementation needs to be improved to ensure that re-creating a Gender object via deserialization doesn't create new objects but uses the existing objects. See this article for details on how that's done:
http://developer.java.sun.com/developer/Books/shiftintojava/page1.html

Newbie needs help with browser compatibility

Ok, so I'm new at this, so this may be something really
simple, but browser compatibility? I made a site in DW;html and it
shows up perfect in safari but internet explorer and firefox not so
much. I did a browser compatibility test in DW and it says nothing
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On my home page, the image of a house that I have next to the
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And my page layout, everything is moved over funny in other
browsers. Also there are link boxes around the table I created with
different brands of products. On safari the boxes do not show, but
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Need help!!
The link is holmeshifi.com and I posted code from the home
page!

OK thanks Ned sorry to soo dumb I'm on a learning curve here! what
I'm trying to do is go to the URLs of web galleries of images from my
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Help reg what formats to be used for my new 4tb mini stack to back up my macbook and 2 external hard disks

Hey Guys,
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3) 1 Tb for Samsung back up
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Get Disk Warrior that will repair the problems without requiring that you reformat the drive - $99.00 on a bootable CD. Will not work on a FAT formatted drive.
You will need to use Drag and Drop to save your files by copying them from the bad drive to a good one.
To reprep the drive:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
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Need help with XML Compatibility between CS3 and CS4

I'm not a Dreamweaver guru but I am hoping someone will recognize my issue and be able to provide meaningful feedback.
Background:
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Has anyone seen anything like this before???
Help...

Thank you for your response.
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ts_new.xml
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Help reg Down Payment - Urgent

When i put down payment here in VA01 billing plan (WBS element linked)
For e.g., PR00 = Rs. 1,00,000
Billing Plan
30%, 40% and remaining after the receipt of material at client's site
but commercial and excise invoice will go with the material with 100% value
1.30 % value - 30, 000 Billing Type FAZ - Down payment Request
2.40% value - 40,000 Billing Type FAZ - Down payment Request
So now,only 70% of the PR00 is recieved
But in the sales order if i put 30% ..it is talking 30% of net price(PR00 + EDCESSCST/VAT+ Service Tax) and the same case with 40% DP also.
when i create a down payment request, AZWR condition type is throwing with the information message, saying that " Downpayment value is higher/lower than pre-set value"
customer down payment is normally some % of the agreed price(PR00)
how to tell to the SAP system that when i create FAZ it shud take % of PR00 and When I do F2 invoice(1,00,000 + ED+Taxes) it shud take everything into account?
Plz help me.
Regards,
Anbu

done

Need help reg sender JDBC adapter

Hi,
I am having a requirement like, i need to fetch the data from two data base tables. and after fetching the data, i need to update those two tables.
For selecting the data from two tables, two select statements i need to write, how i can give two select statements in sender JDBC comm channel.
In sender JDBC channel, only one update query we can give...how i can update two tables?
Regards,
Venkata Ramana.

Hello Venkat,
For your requirement, go for stored procedure and find the below thread.
Fetching data from JDBC without using JDBC sender adapter
Re: Executing an Oracle Stored Procedure from Sender JDBC adapter
Re: Sender JDBC adapter not picking up data
Re: Retrive data from two diffirent tables
hope this will help you
Thanks,
Venky

Help reg. multipage form

Hi,
I am doing a project in multipage form. I have found similar web application and it has been implemented in JSP. I have gone through the code.Not able to get it. The guy who implemented it is using one controller.jsp. when the user clicks back button then the data already selected is also displayed. If I see the code of any page one html from will be there. If the url has been observed, always directed to controller.jsp. can anyone let me know how it was implemented. The following is the link.
http://donner.cs.uni-magdeburg.de:8080/elearning/modelschoice.jsp
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Alright,people their are using View Controller pattern.
Here is how they could have done it.
They might have designed dedicated JSP for each and everyform their.
Including same .gif file in the header part.
However,they are calling a single JSP file/Servlet /Struts Dispatch Action/Or any backing bean(with url pattern controller.jsp).
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hope the below link might be of some help :)
http://www.javaworld.com/javaworld/jw-12-1999/jw-12-ssj-jspmvc.html
http://java.sun.com/blueprints/patterns/MVC-detailed.html
http://java.sun.com/blueprints/patterns/MVC.html
http://www.ftponline.com/javapro/2002_05/magazine/columns/weblication/
http://www.javapassion.com/j2ee/MVCPatternAndFrameworks_speakernoted.pdf
http://www.springframework.org/docs/reference/mvc.html
http://java.sun.com/developer/EJTechTips/2004/tt0324.html#1
http://www.developer.com/java/ent/article.php/3558501
http://www.csis.pace.edu/~bergin/mvc/mvcgui.html
REGARDS,
RaHuL

Urgent deadline - Please help - Linux serialization problem

Hi -
I have a presentation on Wednesday morning of my program for my dissertation. I developed the whole thing in windows - it all works great... but the demo is on a Linux machine. Fortunately I tested today in Linux. I have a real problem. I want to save out a class instance. This code works fine in Windows:
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Olly

Hi ,
Please try to add this code to u'r prg.
private void writeFile(String s, String s1)
throws IOException
Object obj = null;
FileWriter filewriter = null;
BufferedWriter bufferedwriter = null;
if(sfmsDebug)
System.out.println("Before Writing Received Messages To a File.");
String s2 = System.getProperty("file.separator");
if(System.getProperty("os.name").toUpperCase().indexOf("WIN") !=
-1)
File file = new File("c:" + s2 + s1);
boolean flag = file.createNewFile();
filewriter = new FileWriter("c:" + s2 + s1, true);
bufferedwriter = new BufferedWriter(filewriter);
} else
File file1 = new File("/home/usr2/barcwas1" + s2 + s1);
boolean flag1 = file1.createNewFile();
filewriter = new FileWriter("/home/usr2/barcwas1" + s2 + s1, true);
bufferedwriter = new BufferedWriter(filewriter);
bufferedwriter.write(s, 0, s.length());
bufferedwriter.write("\r\n");
bufferedwriter.close();
filewriter.close();
if(sfmsDebug)
System.out.println("After Writing Received Messages To a File.");
}

Want help in Serialization

Hi all,
My requirement is there is a DTO object which i have. called Employee with many attributes like name, age , sex etc. Instead of storing each if the fields in different columns of the databse I wanna store it by serializing the object and persisting it in the databse. The column name type will have int. Is this possible. I have never known serialization. How do i do it. Is there any good tutorial for me to start of with serialization..
This is an urgent requirement. What all do i need to know in order to persist the data and also I should be able to retrieve the column when queried and read the data.
Regards,
Hemanth

Just make the class implement Serializable. However the column type will have to be Blob, not int.

Need help reg SUBTOT

Hi,
I am using slis_sortinfo_alv for doing subtotal in a report,but the problem is i even wat to display some text like 'Subtot'before the value.
Need help.
I want to display my sub total like below format.
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Hi,
Make use of the below statement :
display_text_for_subtotal = 'TEXT'.
For reference you can refer to LSLVC_FULLSCREENF02 Include program.
Thanks,
Sriram POnna.

Urgent Help reg setting the maxlength of a text box

Hi all,
I want to set the max length or the no of characters to be entered of a textbox in parent page from a child popup window.
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this is really a js question and im not sure that you can access the formElem.maxlen property unless you get into DOM coding
...but ...
maybe u could use something like this and set it from the parent window to the onkeyup event on the text box in the parent
function textLimit(field, maxlen) {
if (field.value.length > maxlen) {
field.value = field.value.substring(0, maxlen);
alert('your input has been truncated!');
} }hth
g00fy

Need Help reg Video

Hello,
I have written an application to show video on J2ME devices. The application shows video properly. If the video is huge it takes time to download all video and then plays it. How can I stream part of video of a huge video and we show the downloaded part of video and keep streaming video simultaneously. How to achieve such type of video from internet ?
I look forward for any help, ideas, suggestions. Any help is highly appreciated.
Thanks,

Don't double post. I've removed the thread you started int he Sun Wireless Toolkit forum.
db

Help reg. serialization compatibility

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