Object serialized Problem
Hi there,
I got one window mapped to a object ( say ObjectA ). The window
contains textbox, droplist. I then serialized the object (ObjectA) to a
file and read it back to memory. Everything seems fine except the droplist
shown the wrong data.
e.g. The droplist map to a listelement having objects ( say
Object1,Object2,Object3).
The ObjectA has value Object3.
After writeserialized and readserialized the window shown Object1 in
the droplist rather than Object3. In the debugger, I can tell the ObjectA
has value Object3. But after displaying the window, the value in ObjectA
changed to Object1 same as the droplist.
Any ideal what's going on ?
Any help is welcome!
Kelvin
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Yes, I know that I cannot serialized a window class. But ObjectA is not a
window class. It is only a object. I have a window ( says WindowA ) which
mapped to ObjectA. Can I serialized objectA ??
Kelvin
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'unsubscribe forte-users' as the body of the message.
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Message was edited by:
theazazel -
Repeated object sending problem
why when you serialize the same reference multiple times after an internal state change does it not update in the sent copy?
meaning , if i have a Tree object with a height parameter , and i send it with height=50 and then i update the same objects (SAME!!!) height
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zeda wrote:
Peter__Lawrey wrote:
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Hi,
I'm running into a problem when passing a JDO object id as an argument to a
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instantiate a bean which wraps the JDO object. Since the JDO object is not
Serializable, I'm passing the object id to the bean constructor, so that the
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without ever serializing the object.
I'm guessing that the JDOId class for the JDO object is generated on the fly
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Exception in thread "main" java.lang.reflect.UndeclaredThrowableException:
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RMI class loader disabled)
at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteC
all.java:245)
at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
at
org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker_Stub.invokeHome(Unkno
wn Source)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invokeHome(HomeProxy.java:25
8)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invoke(HomeProxy.java:182)
at $Proxy0.create(Unknown Source)
at test.TheTestRemote.<init>(Unknown Source)
at test.TheTest.getRemoteObject(TheTest.java:19)
at
com.hcm.tools.util.CollectionHelper.getFirst(CollectionHelper.java:23)
at
com.hcm.tools.jdo.JDOFactory.executeSingletonQuery(JDOFactory.java:234)
at test.Test.print(Test.java:22)
at test.Test.main(Test.java:11)Hi David,
I'm trying to use JDO to completely replace Entity Beans. Of course, this
leaves me with an important question: how do you make the JDO object
available remotely? My answer is to wrap JDO objects with a stateful
session bean, and pass through method calls made on the bean to the JDO
object. Both the bean and the JDO object will implement some interface, so
you can use an object in a client without any knowledge as to whether it is
a bean or a JDO object. ( Important note: I can get away with this because
of another cool Solarmetric product, the session bean creator, which
enhances a simple java object into a session bean )
Now, once I have some interface implementation, maybe a local persistent
object, maybe a remote object, I will want to do something with it. There
are a couple considerations here. First, if I want to edit the object, I
need to make sure a transaction gets started. I do this by having my
session beans take care of starting and committing transactions. Since I
have written my own JDO Factory that takes care of synchronizing PM caches
across transactions, this has the effect of keeping all my caches in the
appserver up-to-date as well ( more on that if you're interested ). So, in
order to call a 'set' method, I need to ensure that the object I have is in
it's "remote" state, so-to-speak.
So I created an interface called RemotePersistentObject, which all these
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getObjectId (). The reason for getObjectId (), instead of
getPersistentObject (), is that often times you don't want your JDO objects
to be Serializable, especially if you have JDO objects that you want to
guarantee remain unique ( say, no two Stock objects have the same ticker
symbol ). Besides, you want the remote object to represent the same
concept, and as soon as you serialize the persistent object, you have a copy
of the original JDO object that will no longer do nice things you'd like it
to do, like get updated when some transaction in a different thread modifies
a field.
So, to get around this serialization issue, I just pass the JDO object id to
the bean, and have the bean lookup and wrap the appropriate JDO object on
the server. I wrote a couple optional base classes that provide a lot of
the functionality for this, since it turns out that wrapping a
non-serializable JDO object is non-trivial. The problem there is that when
the bean passivates, it serializes the state of the session bean... oops.
So the base classes take care of keeping a transient reference to the actual
object, while keeping a non-transient ref to the object id. All attempts to
use the actual JDO object are filtered through a getObject () method, which,
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object in a read-only PM again.
Hmmmm. Lots of stuff here. I'll stop here and answer any questions (
criticisms ) you may have.
-Eric
"David Ezzio" <[email protected]> wrote in message
news:[email protected]...
Eric,
Curious minds want to know: what are you up to here? I found this to
be a very interesting post, and I would like to know more about the
architecture you are using and its motivation if you can share it.
David Ezzio
Eric Lindauer wrote:
Hi,
I'm running into a problem when passing a JDO object id as an argument
to a
bean. My client is finding a JDO object locally, then attempting to
instantiate a bean which wraps the JDO object. Since the JDO object isnot
Serializable, I'm passing the object id to the bean constructor, so thatthe
bean can look up the object again, this time in the appserver, and wrapit,
without ever serializing the object.
I'm guessing that the JDOId class for the JDO object is generated on thefly
in the client, and therefore does not exist in the ClassLoader in the
appserver. Any ideas how I can fix this?
Thanks,
Eric
Exception in thread "main"java.lang.reflect.UndeclaredThrowableException:
java.lang.ClassNotFoundException: test.TheTest$JDOId (no securitymanager:
RMI class loader disabled)
at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteC
all.java:245)
at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
at
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wn Source)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invokeHome(HomeProxy.java:25
8)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invoke(HomeProxy.java:182)
at $Proxy0.create(Unknown Source)
at test.TheTestRemote.<init>(Unknown Source)
at test.TheTest.getRemoteObject(TheTest.java:19)
at
com.hcm.tools.util.CollectionHelper.getFirst(CollectionHelper.java:23)
at
com.hcm.tools.jdo.JDOFactory.executeSingletonQuery(JDOFactory.java:234)
at test.Test.print(Test.java:22)
at test.Test.main(Test.java:11) -
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import java.util.*;
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eleHeadLine.setAttribute("fieldName","HEADLINE");
if((rs.getString("HEADLINE")).length()>0) eleHeadLine.appendChild(doc.createTextNode(rs.getString("HEADLINE")));
Element eleSummary = doc.createElement("FIELD");
rootFieldElem.appendChild(eleSummary);
eleSummary.setAttribute("fieldName","SUMMARY");
if(rs.getString("SUMMARY")==null){
//out.println("String is null");
else
{eleSummary.appendChild(doc.createTextNode(rs.getString("SUMMARY")));}
Element eleAuthor = doc.createElement("FIELD");
rootFieldElem.appendChild(eleAuthor);
eleAuthor.setAttribute("fieldName","AUTHOR");
if((rs.getString("AUTHOR")).length()>0) eleAuthor.appendChild(doc.createTextNode(rs.getString("AUTHOR")));
Element elePageFrom = doc.createElement("FIELD");
rootFieldElem.appendChild(elePageFrom);
elePageFrom.setAttribute("fieldName","PAGEFROM");
if((rs.getString("PAGEFROM")).length()>0) elePageFrom.appendChild(doc.createTextNode(rs.getString("PAGEFROM")));
Element elePubName = doc.createElement("FIELD");
rootFieldElem.appendChild(elePubName);
elePubName.setAttribute("fieldName","PUBNAME");
if((rs.getString("PUB_NAME")).length()>0) elePubName.appendChild(doc.createTextNode(rs.getString("PUB_NAME")));
Element eleReaderName = doc.createElement("FIELD");
rootFieldElem.appendChild(eleReaderName);
eleReaderName.setAttribute("fieldName","READER NAME");
if((rs.getString("READER_NAME")).length()>0) eleReaderName.appendChild(doc.createTextNode(rs.getString("READER_NAME")));
Element eleParentTitle = doc.createElement("FIELD");
rootFieldElem.appendChild(eleParentTitle);
eleParentTitle.setAttribute("fieldName","PARENTTITLE");
if((rs.getString("PARENTTITLE")).length()>0)eleParentTitle.appendChild(doc.createTextNode(rs.getString("PARENTTITLE")));
Element eleCanMail = doc.createElement("FIELD");
rootFieldElem.appendChild(eleCanMail);
eleCanMail.setAttribute("fieldName","CANMAIL");
if((rs.getString("CANMAIL")).length()>0) eleCanMail.appendChild(doc.createTextNode(rs.getString("CANMAIL")));
Element elePublicationID = doc.createElement("FIELD");
rootFieldElem.appendChild(elePublicationID);
elePublicationID.setAttribute("fieldName","PUBLICATION_ID");
if((rs.getString("PUBLICATION_ID")).length()>0) elePublicationID.appendChild(doc.createTextNode(rs.getString("PUBLICATION_ID")));
Element eleJournlistID = doc.createElement("FIELD");
rootFieldElem.appendChild(eleJournlistID);
eleJournlistID.setAttribute("fieldName","JOURNALIST_ID");
if((rs.getString("JOURNALIST_ID")).length()>0) eleJournlistID.appendChild(doc.createTextNode(rs.getString("JOURNALIST_ID")));
Element eleIspdf = doc.createElement("FIELD");
rootFieldElem.appendChild(eleIspdf);
eleIspdf.setAttribute("fieldName","ISPDF");
if((rs.getString("ISPDF")).length()>0) eleIspdf.appendChild(doc.createTextNode(rs.getString("ISPDF")));
Element rootKeyElem=doc.createElement("KEYWORDS_CODES");
String[] arrCodes=getKeyCodes(rs.getString("ARTICLEID"));
int count1 = myVector1.size();
String[] myArray1=new String[count1];
myVector1.copyInto(myArray1);
int count2 = myVector2.size();
String[] myArray2=new String[count2];
myVector2.copyInto(myArray2);
for(int j=0;j<arrCodes.length;j++)
Element eleKeyword= doc.createElement("KEYWORD_CODE");
eleKeyword.setAttribute("CodeId",arrCodes[j]);
eleKeyword.setAttribute("LongName",myArray1[j]);
eleKeyword.setAttribute("CodeType",myArray2[j]);
rootKeyElem.appendChild(eleKeyword);
artElem.appendChild(rootKeyElem);
Source source = new DOMSource(docElem);
//File file = new File("/share/PrintDom.xml");
StringWriter rw=new StringWriter();
Result result = new StreamResult(rw);
//Result result = new DOMResult();
// Write the DOM document to the file
Transformer xformer = TransformerFactory.newInstance().newTransformer();
xformer.transform(source, result);
out.println(rw);
catch (ClassNotFoundException e)
out.println("Unable to load Driver Class" + e);
return;
//fileLog.log(e,"PressWatchFrame1.PressWatchFrame1()");
catch (SQLException se)
out.println(se);
catch (Exception e)
out.println(e);
finally{
try{
if(Conn!=null) Conn.close();
catch(SQLException ignored){}
public String[] getKeyCodes(String strArticleId)
Vector myVector=new Vector();
myVector1.removeAllElements();
myVector2.removeAllElements();
try{
stmt1=Conn.createStatement( );
//String strSql1="Select codeid FROM SCANSSUBJECT where articleid='"+ strArticleId +"'";
String strSql1="Select ss.codeid,c.longname,c.codetype FROM SCANSSUBJECT ss,CODES c where ss.codeid=c.codeid and articleid='"+ strArticleId +"'";
rs1=stmt1.executeQuery(strSql1);
String strCodes="";
while(rs1.next())
myVector.add(rs1.getString("codeid"));
myVector1.add(rs1.getString("longname"));
myVector2.add(rs1.getString("codetype"));
}catch (SQLException se)
out.println(se);
int count = myVector.size();
String[] myArray = new String[count];
myVector.copyInto(myArray);
return myArray;
..................Thanx -
Changing serialVersionUID of objects serialized in a file.
For myResearch project I have created an application that saves it's data by placing its objects in an ArrayList and then serializing the ArrayList to file.
Up untill now it has been going swimmingly over 18 months. However, I am now for seemingly no reason encountering versioning errors when my app tries to de-serialise the objects. This happens for classes that I have not modified in any way.
I know now that I should manually set the serialVersionUID of my objects to overcome this in the future.
However, my core quesion is:
Can I change the serialVersionUID of the objects in the ArrayList of the serialized file. Otherwise I have to rebuild over 100 program save files.
Kind Regards,
Andrew.They all have serialVersionUID like
-6011647393756382469
You suggestion will not be a very elegent solution,
as the numbers are meaningless.I do not know what you're talking about. SerialVersionUID numbers are meaningless. They are cryptographic functions of the class signature. They are not intended to be meaningful to anybody but the Serialization subsystem. If you're using them for some other purpose, you're breaking a cardinal rule of computing - a field should not be used for more than one purpose. Don't.
In any case the solution I gave is by a long chalk the most practical.
Is it possible to de-serialise an object, change its
serialVersionUID and then save it again.Why on earth would you go to all this useless bother when you already have a solution? -
Array in object overwrite problem
Hi
hope you can help me with this as i've already been using too much time solving it myself :)
I got a Board class which have an ArrayList<ArrayList<Integer>> as attribute. The Board class is controlled from my service class. I need to create a lot of boards which all needs different ArrayList<ArrayList<Integer>> input, so i made a for loop which creates the Boards. The problem is however when i change the variable i used to create the object the values also change inside the object even though the create method have already been called. English isn't my native language so it's a bit hard to explain :) Please ask if there's something you don't understand.
thanks in advance!
I made a temporary solution by making a 3d arraylist so i won't have to overwrite any values but thats not rly a good solution as it's starting to give me problems elsewhere.
the method that creates the boards is Service.importCSV()
model.Board
package model;
import java.util.ArrayList;
public class Board {
private String controleNumber;
private ArrayList<ArrayList<Integer>> numbers = new ArrayList<ArrayList<Integer>>();
private ArrayList<ArrayList<Integer>> remainingNumbers = new ArrayList<ArrayList<Integer>>();
public Board(String controlenumber, ArrayList<ArrayList<Integer>> numbers) {
this.controleNumber = controlenumber;
this.numbers = numbers;
this.remainingNumbers = numbers;
public String getControlenumber() {
return controleNumber;
public void setControlenumber(String controleNumber) {
this.controleNumber = controleNumber;
public ArrayList<ArrayList<Integer>> getNumbers() {
return numbers;
public void setNumbers(ArrayList<ArrayList<Integer>> numbers) {
this.numbers = numbers;
public void setRemainingNumbers(ArrayList<ArrayList<Integer>> remainingNumbers) {
this.remainingNumbers = remainingNumbers;
public ArrayList<ArrayList<Integer>> getRemainingNumbers() {
return remainingNumbers;
public String toString() {
return String.valueOf(controleNumber);
}service.Service
package service;
import gui.MainFrame;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import ramdao.BoardDao;
import model.Board;
public class Service {
private static ArrayList<Integer> numbers = new ArrayList<Integer>();
public static List<Board> getAllBoards() {
return BoardDao.getAllBoards();
public static Board createBoard(String controleNumber, ArrayList<ArrayList<Integer>> numbers) {
Board board = new Board(controleNumber, numbers);
BoardDao.store(board);
return board;
public static void deleteBoard(Board board) {
BoardDao.remove(board);
public static Board checkFor(int checkFor) {
for(Board board : getAllBoards()) {
System.out.println(board.getRemainingNumbers());
for(ArrayList<Integer> row : board.getRemainingNumbers()) {
for(int i=0;i<row.size();i++) {
if(numbers.contains(row.get(i))) {
row.remove(row.get(i));
if(checkFor==1) {
for(ArrayList<Integer> row : board.getRemainingNumbers()) {
if(row.size()==0) {
return board;
else if(checkFor==2) {
if(board.getRemainingNumbers().get(0).size()==0 && board.getRemainingNumbers().get(1).size()==0) {
return board;
else if(board.getRemainingNumbers().get(0).size()==0 && board.getRemainingNumbers().get(2).size()==0) {
return board;
else if(board.getRemainingNumbers().get(1).size()==0 && board.getRemainingNumbers().get(2).size()==0) {
return board;
else if(checkFor==3) {
if(board.getRemainingNumbers().size()==0) {
return board;
System.out.println(board.getRemainingNumbers() );
return null;
public static ArrayList<Integer> oneToGo(int rows, ArrayList<Integer> numbers) {
//TO-DO
return null;
public static void importCSV(ArrayList<String> buff) {
ArrayList<ArrayList<ArrayList<Integer>>> allNumbers = new ArrayList<ArrayList<ArrayList<Integer>>>();
int line = 0;
String controleNumber = "";
String[] splitLine = new String[10];
for(int i=0;i<buff.size();i++) {
//adds the split buff to splitLine
for(int q=0;q<buff.get(i).split(";").length;q++) {
if(buff.get(i).split(";")[q].equals(""))
splitLine[q]="0";
else
splitLine[q]=buff.get(i).split(";")[q];
if(line==0) {
allNumbers.add(new ArrayList<ArrayList<Integer>>());
ArrayList<Integer> row = new ArrayList<Integer>();
allNumbers.get(allNumbers.size()-1).add(row);
controleNumber=buff.get(i).split(";")[0];
for(int q=buff.get(i).split(";").length;q<10;q++) {
splitLine[q]="0";
for(int q=0;q<9;q++) {
row.add(Integer.valueOf(splitLine[q+1]));
else if(line==1) {
ArrayList<Integer> row = new ArrayList<Integer>();
allNumbers.get(allNumbers.size()-1).add(row);
for(int q=buff.get(i).split(";").length;q<9;q++) {
splitLine[q]="0";
for(int q=0;q<9;q++) {
row.add(Integer.valueOf(splitLine[q]));
else if(line==2) {
ArrayList<Integer> row = new ArrayList<Integer>();
allNumbers.get(allNumbers.size()-1).add(row);
for(int q=buff.get(i).split(";").length;q<9;q++) {
splitLine[q]="0";
for(int q=0;q<9;q++) {
row.add(Integer.valueOf(splitLine[q]));
createBoard(controleNumber, allNumbers.get(allNumbers.size()-1));
line=-1;
line++;
public static ArrayList<String> readFile(File file) {
FileInputStream fileInputStream = null;
ArrayList<String> buff = new ArrayList<String>();
String line;
try {
fileInputStream = new FileInputStream(file);
BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(bufferedInputStream));
while ((line = bufferedReader.readLine())!= null) {
buff.add(line);
catch (IOException ex) {
Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
finally {
try {
fileInputStream.close();
catch (IOException ex) {
Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
return buff;
public static void addNumber(int number) {
numbers.add(number);
public static ArrayList<Integer> getNumbers() {
return numbers;
}Tried the code but it's full of compiletime errors. I changed it a little but still got
Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problems:
board cannot be resolved
row cannot be resolved
line cannot be resolved
board cannot be resolved
board cannot be resolvedwith the following code
public static void importCSV(ArrayList<String> buff) {
ArrayList<ArrayList<ArrayList<Integer>>> allNumbers
= new ArrayList<ArrayList<ArrayList<Integer>>>();
String[] splitLine = new String[10];
String controleNumber;
for(int i=0;i<buff.size();i++) {
int line = i % 3;
// split the buffer into fields
String[] splitBuf = buff.get(i).split(";");
int start = 0;
if(line==0) { // new board
ArrayList<ArrayList<Integer>> board = new ArrayList<ArrayList<Integer>>();
controleNumber = splitBuf[0];
start = 1;
ArrayList<Integer> row = new ArrayList<Integer>();
// fill row from the buffer fields...
for(int b = start, last = start+9; b < last; b++) {
if(b >= splitBuf.length || splitBuf.length() == 0)
row.add(0);
else
row.add(Integer.valueOf(splitBuf[b]));
}This is my main problem:createBoard(controleNumber, board);
board.clear();
row.clear();The board that i created using the createBord method doesn't hold any numbers because i cleared the arrays i used to create it *after* creating it.
got my software construction teacher to help me today :)
works! public static void importCSV(ArrayList<String> buff) {
ArrayList<ArrayList<Integer>> board = new ArrayList<ArrayList<Integer>>();
ArrayList<Integer> row = new ArrayList<Integer>();
String controleNumber = "";
int line;
for(int i=0;i<buff.size();i++) {
line = i % 3;
String[] splitBuf = buff.get(i).split(";");
int start = 0;
if(line==0) { // new board
board = new ArrayList<ArrayList<Integer>>();
controleNumber = splitBuf[0];
start = 1;
row = new ArrayList<Integer>();
// fill row from the buffer fields...
for(int b = start, last = start+9; b < last; b++) {
if(b >= splitBuf.length || splitBuf[b].length() == 0)
row.add(0);
else
row.add(Integer.valueOf(splitBuf[b]));
board.add(row);
if(line==2) {
createBoard(controleNumber, board);
}Edited by: Briam on Apr 12, 2010 12:37 AM -
ARRAY object creation problem in Java
Hi I am encountring when trying to create ARRAY in one case
while the same code works perfectly in other case.
The following code works fine:
Connection con=getConnection();
String[][] elements = new String[1][2];
elements[0][0] =new Long(1111).toString();
elements[0][1] =new Long(2222).toString();
ArrayDescriptor desc = ArrayDescriptor.createDescriptor("TYPE1",con);
toReturn = new ARRAY(desc,con,elements);
The following CODE GIVES ERROR :
Connection con=getConnection();
String[] elements = new String[1];
elements[0] =new Long(1111).toString();
ArrayDescriptor desc = ArrayDescriptor.createDescriptor("TYPE2",con);
toReturn = new ARRAY(desc,con,elements);
Please help.
FYI :
type TYPE1 is table of OBJECT : (ID NUMBER, Name VARCHAR2(50));
type TYPE2 is table of OBJECT : (ID NUMBER);
I tried to pass array of long ,int etc in case of TYPE2 but with no advantage.Hi Lawrence,
I have checked the system in the correct path only. I am checking in the following path
System Admnistration -->System Landscape-->then Portal content (on the left hand side)
What do you mean by consistancy problem ??? Mean while i will check with basis guys Apart from consulting them , As a Ep consultant do i need to check anything???
please correct me if i am wrong.....
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