Collage Students need help with Java project(Email Server) whats analysis?

Hi im studying in collage at the moment and i have just started learning java this semester, the thing is my teacher just told us to do an project in java , since we just started the course and i dont have any prior knowledge about java i was wondering if some one could help me with the project.
i choose Email Sevice as my project and we have to submit an analysis and design document , but how the hell am i suppose to know what analysis is ? i just know we use ER diagrams & DFD's in the design phase but i dont know what analysis means ?
could some one tell me what analysis on an email service might be? and what analysis on a subject means? is it the codeing involved or some thing coz the teacher told us not to do any codeing yet so im completly stumped,
oh and btw we are a group of 3 students who are asking u the help here coz all of us in our class are stupmed ?

IN case any one is interested this is the analysis i wrote
ANALYSIS
Analysis means figuring out what the problem is, maybe what kinds of solutions might be appropriate
1.     Introduction:-
The very definition of analysis is an investigation of the component parts of a whole and their relations in making up the whole. The Analysis done here is for an emailing service called Flashmail, the emailing service is used to send out mails to users registered with our service, these users and there log activities will be stored in some where, the most desirable option at this time is a Database, but this can change as the scope of the project changes.
2.     Customer Analysis:-
We are targeting only 30 registered users at the moment but this is subject to change as the scale changes of the project .Each user is going to be entitled to 1MB of storage space at this time since we lack the desired infrastructure to maintain anything higher than 1MB but the end vision of the project is to sustain 1000 MB of storage space while maintaining a optimal bandwidth allocation to each user so as to ensure a high speed of activity and enjoyment for the Customer.
The Service will empower the user to be able to send, read, reply, and forward emails to there specified locations. Since we are working on a limited budget we can�t not at this time enable the sending of attachments to emails, but that path is also left open by modularity of java language, so we can add that feature when necessary.
3.     Processor Load Analysis:-
The number of messages per unit time processing power will be determined on hand with various algorithms, since it is best not to waste processor power with liberally distributing messages per unit time. Hence the number of messages will vary with in proportion to the number of registered users online at any given time.
4.     Database Decision Analysis:-
The High level Requirements of the service will have to be decided upon, the details of which can be done when we are implementing the project itself. An example of high level requirements are database management, we have chosen not to opt for flat files because of a number of reasons, first off a flat files are data files that contain records with no structured relationships additional knowledge is required to interpret these files such as the file format properties. The disadvantages associated with flat files are that they are not fast, they can only be read from top to bottom, and usually they have to be read all the way through. Though there is are advantages of Flat files they are that it takes up less space than a structured file. However, it requires the application to have knowledge of how the data is organized within the file.
Good databases have key advantage over flat files concurrency. When you just read stuff from file it�s easy, but tries to synchronize multiple updates or writes into flat file from scripts that run in different process spaces.
Whereas a flat file is a relatively simple database system in which each database is contained in a single table. In contrast, relational database systems can use multiple tables to store information, and each table can have a different record format.
5.     Networking Analysis:-
Virtually every email sent today is sent using two popular protocols known as SMTP (Simple Mail Transfer Protocol) and MIME (Multipurpose Internet Mail Extensions).
1.     SMTP (Simple Mail Transfer Protocol)
The SMTP protocol is the standard used by mail servers for sending and receiving email. In order to send email we will first establish a network connection to our SMTP server. Once you have finished sending your email message it is necessary that you disconnect from the SMTP server
2.     MIME (Multipurpose Internet Mail Extensions)
The MIME protocol is the standard used when composing email messages.

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Need help with calculator project for an assignment...

Hi all, I please need help with my calculator project that I have to do for an assignment.
Here is the project's specifications that I need to do"
"""Create a console calculator applicaion that:
* Takes one command line argument: your name and surname. When the
program starts, display the date and time with a welcome message for the
user.
* Display all the available options to the user. Your calculator must include
the arithmetic operations as well as at least five scientific operations of the
Math class.
-Your program must also have the ability to round a number and
truncate it.
-When you multiply by 2, you should not use the '*' operator to perform the
operation.
-Your program must also be able to reverse the sign of a number.
* Include sufficient error checking in your program to ensure that the user
only enters valid input. Make use of the String; Character, and other
wrapper classes to help you.
* Your program must be able to do conversions between decimal, octal and
hex numbers.
* Make use of a menu. You should give the user the option to end the
program when entering a certain option.
* When the program exits, display a message for the user, stating the
current time, and calculate and display how long the user used your
program.
* Make use of helper classes where possible.
* Use the SDK to run your program."""
When the program starts, it asks the user for his/her name and surname. I got the program to ask the user again and again for his/her name and surname
when he/she doesn't insert anything or just press 'enter', but if the user enters a number for the name and surname part, the program continues.
Now my question is this: How can I restrict the user to only enter 'letters' (and spaces of course) but allow NO numbers for his/her surname??
Here is the programs code that I've written so far:
{code}
import java.io.*;
import java.util.*;
import java.text.*;
public class Project {
     private static String nameSurname = "";
     private static String num1 = null;
     private static String num2 = null;
     private static String choice1 = null;
     private static double answer = 0;
     private static String more;
     public double Add() {
          answer = (Double.parseDouble(num1) + Double.parseDouble(num2));
          return answer;
     public double Subtract() {
          answer = (Double.parseDouble(num1) - Double.parseDouble(num2));
          return answer;
     public double Multiply() {
          answer = (Double.parseDouble(num1) * Double.parseDouble(num2));
          return answer;
     public double Divide() {
          answer = (Double.parseDouble(num1) / Double.parseDouble(num2));
          return answer;
     public double Modulus() {
          answer = (Double.parseDouble(num1) % Double.parseDouble(num2));
          return answer;
     public double maximumValue() {
          answer = (Math.max(Double.parseDouble(num1), Double.parseDouble(num2)));
          return answer;
     public double minimumValue() {
          answer = (Math.min(Double.parseDouble(num1), Double.parseDouble(num2)));
          return answer;
     public double absoluteNumber1() {
          answer = (Math.abs(Double.parseDouble(num1)));
          return answer;
     public double absoluteNumber2() {
          answer = (Math.abs(Double.parseDouble(num2)));
          return answer;
     public double Squareroot1() {
          answer = (Math.sqrt(Double.parseDouble(num1)));
          return answer;
     public double Squareroot2() {
          answer = (Math.sqrt(Double.parseDouble(num2)));
          return answer;
     public static String octalEquivalent1() {
          int iNum1 = Integer.parseInt(num1);
String octal1 = Integer.toOctalString(iNum1);
return octal1;
     public static String octalEquivalent2() {
          int iNum2 = Integer.parseInt(num2);
          String octal2 = Integer.toOctalString(iNum2);
          return octal2;
     public static String hexadecimalEquivalent1() {
          int iNum1 = Integer.parseInt(num1);
          String hex1 = Integer.toHexString(iNum1);
          return hex1;
     public static String hexadecimalEquivalent2() {
          int iNum2 = Integer.parseInt(num2);
          String hex2 = Integer.toHexString(iNum2);
          return hex2;
     public double Round1() {
          answer = Math.round(Double.parseDouble(num1));
          return answer;
     public double Round2() {
          answer = Math.round(Double.parseDouble(num2));
          return answer;
          SimpleDateFormat format1 = new SimpleDateFormat("EEEE, dd MMMM yyyy");
     Date now = new Date();
     SimpleDateFormat format2 = new SimpleDateFormat("hh:mm a");
     static Date timeIn = new Date();
     public static long programRuntime() {
          Date timeInD = timeIn;
          long timeOutD = System.currentTimeMillis();
          long msec = timeOutD - timeInD.getTime();
          float timeHours = msec / 1000;
               return (long) timeHours;
     DecimalFormat decimals = new DecimalFormat("#0.00");
     public String insertNameAndSurname() throws IOException{
          boolean inputCorrect = false;
               while (inputCorrect == false) {
                    while (nameSurname == null || nameSurname.length() == 0) {
                         for (int i = 0; i < nameSurname.length(); i++) {
                         if ((nameSurname.charAt(i) > 'a') && (nameSurname.charAt(i) < 'Z')){
                                   inputCorrect = true;
                    else{
                    inputCorrect = false;
                    break;
                    try {
                         BufferedReader inStream = new BufferedReader (new InputStreamReader(System.in));
                         System.out.print("Please enter your name and surname: ");
                         nameSurname = inStream.readLine();
                         inputCorrect = true;
                    }catch (IOException ex) {
                         System.out.println("You did not enter your name and surname, " + nameSurname + " is not a name, please enter your name and surname :");
                         inputCorrect = false;
                    System.out.println("\nA warm welcome " + nameSurname + " ,todays date is: " + format1.format(now));
                    System.out.println("and the time is now exactly " + format2.format(timeIn) + ".");
                    return nameSurname;
          public String inputNumber1() throws IOException {
          boolean inputCorrect = false;
               while (inputCorrect == false) {
                    try {
                         BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
                         System.out.print("\nPlease enter a number you want to do a calculation with and hit <ENTER>: ");
                         num1 = br.readLine();
                         double number1 = Double.parseDouble(num1);
                         System.out.println("\nThe number you have entered is: " + number1);
                         inputCorrect = true;
                    } catch (NumberFormatException nfe) {
                         System.out.println("\nYou did not enter a valid number: " + "\""+ num1 + "\" is not a number!!");
                         inputCorrect = false;
                    return num1;
     public String calculatorChoice() throws IOException {
          System.out.println("Please select an option of what you would like to do with this number from the menu below and hit <ENTER>: ");
          System.out.println("\n*********************************************");
          System.out.println("---------------------------------------------");
          System.out.println("Please select an option from the list below: ");
          System.out.println("---------------------------------------------");
          System.out.println("1 - Add");
          System.out.println("2 - Subtract");
          System.out.println("3 - Multiply");
          System.out.println("4 - Divide (remainder included)");
          System.out.println("5 - Maximum and minimum value of two numbers");
          System.out.println("6 - Squareroot");
          System.out.println("7 - Absolute value of numbers");
          System.out.println("8 - Octal and Hexadecimal equivalent of numbers");
          System.out.println("9 - Round numbers");
          System.out.println("0 - Exit program");
          System.out.println("**********************************************");
          boolean inputCorrect = false;
               while (inputCorrect == false) {
                    try {
                         BufferedReader inStream = new BufferedReader (new InputStreamReader(System.in));
                         System.out.print("Please enter your option and hit <ENTER>: ");
                         choice1 = inStream.readLine();
                         int c1 = Integer.parseInt(choice1);
                         System.out.println("\nYou have entered choice number: " + c1);
                         inputCorrect = true;
                    } catch (NumberFormatException nfe) {
                         System.out.println("You did not enter a valid choice number: " + "\""+ choice1 + "\" is not in the list!!");
                         inputCorrect = false;
                    return choice1;
     public String inputNumber2() throws IOException {
          boolean inputCorrect = false;
               while (inputCorrect == false) {
                    try {
                         BufferedReader br2 = new BufferedReader (new InputStreamReader(System.in));
                         System.out.print("\nPlease enter another number you want to do the calculation with and hit <ENTER>: ");
                         num2 = br2.readLine();
                         double n2 = Double.parseDouble(num2);
                         System.out.println("\nThe second number you have entered is: " + n2);
                         System.out.println("\nYour numbers are: " + num1 + " and " + num2);
                         inputCorrect = true;
                    } catch (NumberFormatException nfe) {
                         System.out.println("You did not enter a valid number: " + "\""+ num2 + "\" is not a number!!");
                         inputCorrect = false;
                    return num2;
     public int Calculator() {
          int choice2 = (int) Double.parseDouble(choice1);
          switch (choice2) {
                    case 1 :
                         Add();
                         System.out.print("The answer of " + num1 + " + " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 2 :
                         Subtract();
                         System.out.print("The answer of " + num1 + " - " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 3 :
                         Multiply();
                         System.out.print("The answer of " + num1 + " * " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 4 :
                         Divide();
                         System.out.print("The answer of " + num1 + " / " + num2 + " is: " + decimals.format(answer));
                         Modulus();
                         System.out.print(" and the remainder is " + decimals.format(answer));
                         break;
                    case 5 :
                         maximumValue();
                         System.out.println("The maximum number between the numbers " + num1 + " and " + num2 + " is: " + decimals.format(answer));
                         minimumValue();
                         System.out.println("The minimum number between the numbers " + num1 + " and " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 6 :
                         Squareroot1();
                         System.out.println("The squareroot of value " + num1 + " is: " + decimals.format(answer));
                         Squareroot2();
                         System.out.println("The squareroot of value " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 7 :
                         absoluteNumber1();
                         System.out.println("The absolute number of " + num1 + " is: " + decimals.format(answer));
                         absoluteNumber2();
                         System.out.println("The absolute number of " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 8 :
                         octalEquivalent1();
                         System.out.println("The octal equivalent of " + num1 + " is: " + octalEquivalent1());
                         octalEquivalent2();
                         System.out.println("The octal equivalent of " + num2 + " is: " + octalEquivalent2());
                         hexadecimalEquivalent1();
                         System.out.println("\nThe hexadecimal equivalent of " + num1 + " is: " + hexadecimalEquivalent1());
                         hexadecimalEquivalent2();
                         System.out.println("The hexadecimal equivalent of " + num2 + " is: " + hexadecimalEquivalent2());
                         break;
                    case 9 :
                         Round1();
                         System.out.println("The rounded number of " + num1 + " is: " + decimals.format(answer));
                         Round2();
                         System.out.println("The rounded number of " + num2 + " is: " + decimals.format(answer));
                         break;
                    case 0 :
                         if (choice2 == 0) {
                              System.exit(1);
                         break;
               return choice2;
          public String anotherCalculation() throws IOException {
               boolean inputCorrect = false;
               while (inputCorrect == false) {
                         try {
                              BufferedReader br3 = new BufferedReader (new InputStreamReader(System.in));
                              System.out.print("\nWould you like to do another calculation? Y/N ");
                              more = br3.readLine();
                              String s1 = "y";
                              String s2 = "Y";
                              if (more.equals(s1) || more.equals(s2)) {
                                   inputCorrect = true;
                                   while (inputCorrect = true){
                                        inputNumber1();
                                        System.out.println("");
                                        calculatorChoice();
                                        System.out.println("");
                                        inputNumber2();
                                        System.out.println("");
                                        Calculator();
                                        System.out.println("");
                                        anotherCalculation();
                                        System.out.println("");
                                        inputCorrect = true;
                              } else {
                                   System.out.println("\n" + nameSurname + " thank you for using this program, you have used this program for: " + decimals.format(programRuntime()) + " seconds");
                                   System.out.println("the program will now exit, Goodbye.");
                                   System.exit(0);
                         } catch (IOException ex){
                              System.out.println("You did not enter a valid answer: " + "\""+ more + "\" is not in the list!!");
                              inputCorrect = false;
          return more;
     public static void main(String[] args) throws IOException {
          Project p1 = new Project();
          p1.insertNameAndSurname();
          System.out.println("");
          p1.inputNumber1();
          System.out.println("");
          p1.calculatorChoice();
          System.out.println("");
          p1.inputNumber2();
          System.out.println("");
          p1.Calculator();
               System.out.println("");
               p1.anotherCalculation();
               System.out.println("");
{code}
*Can you please run my code for yourself and have a look at how this program is constructed*
*and give me ANY feedback on how I can better this code(program) or if I've done anything wrong from your point of view.*
Your help will be much appreciated.
Thanks in advance

Smirre wrote:
Now my question is this: How can I restrict the user to only enter 'letters' (and spaces of course) but allow NO numbers for his/her surname??You cannot restrict the user. It is a sad fact in programming that the worst bug always sits in front of the Computer.
What you could do is checking the input string for numbers. If it contains numbers, just reprompt for the Name.
AND you might want to ask yourself why the heck a calculator needs to know the users Name.

I need help with document in email

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This forum is for Java, not JavaScript. The two have nothing to do with each other.
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Go here http://www.java.com/en/ and click "Download Now".
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Hi 49ers,
Sorry not to have any real idea of how to help you out here, but this is a Java forum, not JavaScript.
Some Firefox expert may stumble across your post and be able to offer some advice (I hope they do) but this isn't really the best place to post such questions.
Try here: http://www.webdeveloper.com/forum/forumdisplay.php?s=&forumid=3
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Chris.

Need help with Java programming installation question

Sorry for my lack of knowledge about Java programming, but:....
A while back I thought I had updated my Java Runtime Environment programming. But I now apparently have two programs installed, perhaps through my not handling the installation properly. Those are:
J2SE Runtime Environment 5.0 update 5.0 (a 118MB file)
and:
Java 2 Runtime Environment, SE v 1.4.2_05 (a 108MB file)
Do I need both of these installed? If not, which should I uninstall?
Or, should I just leave it alone, and not worry about it?
Yeah, I don't have much in the way of technical knowledge...
Any help or advice would be appreciated. Thank you.
Bob VanHorst

Thanks for the feedback. I think I'll do just that. Once in a while I have a problem with Java not bringing up a webcam shot, but when that happens, it seems to be more website based than a general condition.

Need Help with Java Desktop CP Icon

I just formatted and reinstalled Windows XP Home SP2 and installed the JRE 1.5.0.02. I usually see an icon in my Control Panel but it only appears in the Administrator's CP which I can reach in Safe Mode of course, but it would be easier to deal with if it appeared somewhere on my desktop/taskbar or CP (I am also an Admin). In Safe Mode I made sure that the right settings were made for displaying, but it doesn't.
I know precious little about Java so I need help here.

This forum is dedicated to Sun's Java Desktop System, an alternative desktop operating environment. Try reposting here:
http://forum.java.sun.com/forum.jspa?forumID=54

Day one of my new MacBook Pro & I desparately need help with calendar and email

It's day one of my new relationship with a Mac, and I need help! I'd like to use microsoft exchange to sync my calendars to iCal & my emails the way I currently do with my iPhone 4 and iPad 2. The problem is that all I get are error messages. They either say that communication with the server cannot be established or communication to ports 80 & 440 cannot be established. One account I'd an ssl and the others are gmail. Please advise!

anyone? please? i would appreciate any information.

Need help with Java Script to perform a calculation in Adobe Acrobat Pro 9 form

I have a form (test) that I am creating in Adobe Acrobat Pro 9.
I need help creating custom Java Script so I can get the desired answer.
1) There are several questions in each group that require a numerical answer between 0-4
2) There is a total field set up to sum the answers from all above questions
3) The final "score" takes the answer from Step 2 above and divides by the total possible answer
Any help on what Java Script I need to complete this would be greatly appreciated!
I've attached a "spreadsheet" that shows it in more detail as well as what formulas I used in Excel to get the desired end result.
Thanks in advance.

Have you tried the "The field is the average of:"?

Need HELP with JAVA RUNTIME Environment

Hi,
I just download J2EE, J2SE, and Ant from sun site. I am having problem to compile java program. Here what I did
1)     Download J2EE at c:\j2sdkee1.3.1 directory
2)     J2SE at c:\Program Files\Java\j2re1.4.1_01 dir
3)     Ant at ant c:\Jakarta_ant-1.3 dir
My operating system is windows 2000. Therefore, I set up environment variables from system ->Advance ->Environment ->Variables ->System variables ->New
Variable = ANT_HOME
Value = c:\ant\Jakarta_ant-1.3
Variable = J2EE_HOME
Value = C:\j2sdkee1.3.1
Variable = JAVA_HOME
Value = c:\Program Files\java\j2re1.4.1_01
Variable = CLASSPATH
Value = c:\j2sdk221.3.1\lib\j2eetools.jar
Edit
Variable = Path
Value =
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\MSSQL7\BINN;%JAVA_HOME%\bin;%J2EE_HOME%\bin;%ANT_HOME%\bin
I restart my machine and try to execute the following command from command Prompt in c:\ dir
C:\> j2ee ?verbose
The following message pop up
?C:\Program? is not recognized as an internal or external command, operable program or batch file.
I would appreciate if someone explain me what I did wrong in set up so this test program is not working.
Do I need to run j2ee ?verbose some other directory? Which directory should I compile my java file?
Did I set up my environment variable correctly or I need to do something else?
Please help me out.
Thanks a lot.
Sam

try to set JAVA_HOME environment variable to
C:\PROGRA~1\java\J2RE14~1.1_0
when you dir name contains space symbols, you should enclose it in commas or use a short form
"C:\Program Files\java\j2re1.4.1_01"
is equals to
C:\PROGRA~1\java\J2RE14~1.1_0

New @ RMI need help with java.rmi.UnmarshalException: error unmarshalling

Hi @ all out there,
I'm new with Java RMI and have to write a EventSystem for an college project where clients can subscribe to a topic and get notified when someone publishes a message to the subscribed topic.
At server-side I have a class called EventSystem that provides methods for subscribing and unsubscribing from topics, and also for posting messages (for publishers).
To subscribe i thought that the client must specify the topic and also itself ( means that a client calls in this way: obj.subscribe("mytopic", this).
The EventSystem handles a list of all clients, and whenever a new message is posted it goes trough all clients and invokes the handleMessage(String msg) method that all Clients have to provide.
On my local machine without RMi this concept works just great.
I now tried to get it working using RMI , but I get the following Exception when starting the client (the server starts fine) :
Looking up for rmiregistry at 138.232.248.22:1099
Subscriber exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
        java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.io.InvalidClassException: SubscriberImpl; SubscriberImpl; class invalid for deserialization
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:336)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)
        at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
        at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
        at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178)
        at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
        at $Proxy0.subscribe(Unknown Source)
        at SubscriberImpl.main(SubscriberImpl.java:48)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.io.InvalidClassException: SubscriberImpl; SubscriberImpl; class invalid for deserialization
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:293)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.InvalidClassException: SubscriberImpl; SubscriberImpl; class invalid for deserialization
        at java.io.ObjectStreamClass.checkDeserialize(ObjectStreamClass.java:713)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1733)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:290)
        ... 9 more
Caused by: java.io.InvalidClassException: SubscriberImpl; class invalid for deserialization
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:587)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
        ... 13 moreI googled now for 2 hours but can't resolve the problem alone. As far as I can understand I have to serialize Objects that I want to send to the server, right?
So how can i do this? I've never used serialization till now.
any ideas how to solve this problem?
greets from italy and sorry for my very weak english
bd_italy

A class has been modified after deployment. Stop the Registry, clean, recompile, and redeploy.

Collage Students need help with Java project(Email Server) whats analysis?

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