EOFException when deserializing object in if statement
Hi,
I'm a java newbie and I've got a program in which I've got an method to open a serialized file.
I am running into problems when determining the class of the object to be deserialized.
When the code is as such everything works fine:
ObjectInputStream ois;
protected void open() {
int returnVal = fc.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
try {
ois = new ObjectInputStream(new FileInputStream(file));
frameSeqA72 = (SeqA72) ois.readObject();
getContentPane().add(frameSeqA72);
frameSeqA72.setVisible(true);
ois.close();
catch (IOException ioe) {ioe.printStackTrace();}
catch (ClassNotFoundException cnfe) {}
}For some reason I don't understand everything changes when I use an if statement in the code as follows:
ObjectInputStream ois;
protected void open() {
int returnVal = fc.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
try {
ois = new ObjectInputStream(new FileInputStream(file));
if (ois.readObject() instanceof SeqA72) {
frameSeqA72 = (SeqA72) ois.readObject();
getContentPane().add(frameSeqA72);
frameSeqA72.setVisible(true);
ois.close();
catch (IOException ioe) {ioe.printStackTrace();}
catch (ClassNotFoundException cnfe) {}
}An EOFException is thrown when this method is called -
"EOFException at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1267)..."
My serialized objects are of different classes so I want to determine the class before casting...so Im using "if (ois.readObject() instanceof SeqA72)".
Why would the first version work and the second throw an exception?
Am I going about this in a bad way?
Casey
You're calling readObject twice, so it's trying to read two objects.
Read it once and save a reference in a variable. Use that variable, instead of calling readObject again.
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See the pic below.
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Attachments:
problem.zip 729 KB -
StreamCorruptedException when deserializing from a DatagramPacket
Using jrockit 1.4.2_05 or jrockit 1.5.0_03 on Windows XP,I get some troubles when deserializing an object from a DatagramPacket received from a multicast socket. It seems that jrockit incorrectly read the object. Some fields are altered, and if the object is too long I get a StreamCorruptedException. When I run the receiver program with the Sun JDK, it works correctly.
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A bit more on this topic.
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Here some code (I hope that I didn't forget something important):
1. A class inside the JaveaBeans to manage events:
* NavBean_EventsBroadcaster is a singleton class used in the JavaBean to manage (fire)
* the events; and also to manage (add/remove) the listeners.
* Events are raised when users push buttons with the purpose to change the display of
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public class NavBean_EventsBroadcaster implements Serializable {
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private static NavBean_EventsBroadcaster eventsBroadcaster_ForNavBeans = null;
Method to get the instance of the singleton class
static public NavBean_EventsBroadcaster getSingletonInstance() {
if (eventsBroadcaster_ForNavBeans == null) {
eventsBroadcaster_ForNavBeans = new NavBean_EventsBroadcaster();
return eventsBroadcaster_ForNavBeans;
} // getSingletonInstance
* fireTheEvent_X_navBean(): method that raise events
public void fireTheEvent_X_navBean(
Object source,
NavigatorBean_eventsList_ENUM nbEvtENUM,
ResultSet rst,
int keyReg) {
if (listeners != null && !listeners.isEmpty()) {
// object is going to be created (it contains the infos about the event)
NavBeanDB_EventDescriptor event_descr =
new NavBeanDB_EventDescriptor(
source, // dBbeanNavigator
nbEvtENUM,
rst,
keyReg);
// copy of the lisener to use it for add or remove
Vector targets;
synchronized (this) {
targets = (Vector) listeners.clone();
// proper event (select first, next, prev, last reg) is raised
Enumeration enumerat = targets.elements();
while (enumerat.hasMoreElements()) {
NavBeanDBListener_INTERFACE l =
(NavBeanDBListener_INTERFACE) enumerat.nextElement();
l.firedNavigationBeanEvents(event_descr);
System.out.println("Method fireTheEvent ----- key = " + priKeyOnTheScreen);
} // if
} // fireTheEvent()
* Adds a listener to the listener list.
* @param l The listener to add.
synchronized public void addNavBeanAddListener(NavBeanDBListener_INTERFACE l) {
if (listeners == null) {
listeners = new Vector();
listeners.addElement(l);
System.out.println("E' stato registrato un nuovo ascoltatatore per navigationBar");
} // addNavBeanAddListener()
* Removes a listener from the listener list.
* @param l The listener to remove.
synchronized public void removeNavBeanRemoveListener(NavBeanDBListener_INTERFACE l) {
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* This is the interface that specifies the contract between a NavBeans
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* @author Owner
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} // interface NavDB_BeansListener_INTERFACE3. the class adapter
public abstract class DbNavigatorBean_Adapter implements NavBeanDBListener_INTERFACE {
NavigatorBean_eventsList_ENUM navigatorBean_eventsList_ENUM;
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} // costruttore
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* @param evt
// NavigatorBean_eventsList_ENUM {user_chang, sequential_first, sequential_prev, sequential_next, sequential_last}
public void firedNavigationBeanEvents(NavBeanDB_EventDescriptor evt) {
navigatorBean_eventsList_ENUM = evt.getEventType();
switch (navigatorBean_eventsList_ENUM) {
case user_chang:
toDoWhen_user_changeRegistration(evt);
break;
case sequential_first:
toDoWhen_setted_firstRegistration(evt);
break;
case sequential_prev:
toDoWhen_setted_prevRegistration(evt);
break;
case sequential_next:
toDoWhen_setted_nextRegistration(evt);
break;
case sequential_last:
toDoWhen_setted_lastRegistration(evt);
break;
} // witch case
} // firedNavigationBeanEvents()
abstract public void toDoWhen_user_changeRegistration(NavBeanDB_EventDescriptor evt); // { }
abstract public void toDoWhen_setted_firstRegistration(NavBeanDB_EventDescriptor evt); // { }
abstract public void toDoWhen_setted_nextRegistration(NavBeanDB_EventDescriptor evt); // { }
abstract public void toDoWhen_setted_prevRegistration(NavBeanDB_EventDescriptor evt); // { }
abstract public void toDoWhen_setted_lastRegistration(NavBeanDB_EventDescriptor evt); // { }
} // class class DbNavigatorBean_Adapter_base4. the class used to describe the event
Class used to dercribe the event that happened.
public class NavBeanDB_EventDescriptor extends EventObject {
private NavigatorBean_eventsList_ENUM navigationBean_events_ENUM;
private int primaryKeyOfRegOnTheScreen;
private ResultSet resultSet;
private int totOfRegsRegistredOnTheTable;
* Costructor: is used to describe the events
* @param source
* @param nbEvtENUM
* @param rst
* @param keyReg
public NavBeanDB_EventDescriptor( // costruttore
Object source,
NavigatorBean_eventsList_ENUM nbEvtENUM,
ResultSet rst,
int keyReg) {
super(source);
this.navigationBean_events_ENUM = nbEvtENUM;
this.resultSet = rst;
this.primaryKeyOfRegOnTheScreen = keyReg;
extractTotRegsInTheTable(rst);
// this.totOfRegsRegistredOnTheTable = rgsRegNmbr;
System.out.println("Viene creata una istanza di event descriptor");
}// costruttore
* which possibe action caused the event,
* was pushed the button (first, prev, next, last, user select...)
* @return
public NavigatorBean_eventsList_ENUM getEventType() {
return navigationBean_events_ENUM;
} // getEventType
* primmary key of registration on the screen
* @return
public int getPrimaryKeyOfTheRegOnTheScreen() {
return primaryKeyOfRegOnTheScreen;
} // getKeyRegOnTheScreen
* resultSet showed on the screen
public ResultSet getTheFullRegistrationOnTheScreen() {
return resultSet;
} // getTheFullRegistrationOnTheScreen
Number of registrations actually on the table.
public int getTotRegsRegistredOnTheTable() {
return this.totOfRegsRegistredOnTheTable;
} // getRegsRegistredNmbr
private classe that get data
private void extractTotRegsInTheTable(ResultSet rst) {
ResultSet localRst =rst;
try {
int curRow = localRst.getRow();
localRst.last();
this.totOfRegsRegistredOnTheTable = localRst.getRow();
localRst.absolute(curRow);
} catch (SQLException ex) {
Logger.getLogger(NavBeanDB_EventDescriptor.class.getName()).log(Level.SEVERE, null, ex);
} // class NavBeansEvent5. a possible use of the JavaBeans
public class TableClients extends JFrame
implements LinkTablesToDlgThatRandomizeSelections_INTERFACE {
private NavigationBean navigationBean;
public TableClients() { // constructor
navigationBean = new NavigationBean();
navigationBean.initializeDBbeanNavigator(...);
this.add(navigationBean);
navigationBean.addActionNavigatorListener(new DbNavigatorBean_Adapter() {
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// do something
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// do something
@Override
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// do something
@Override
public void toDoWhen_setted_prevRegistration(NavBeanDB_EventDescriptor nbdbed) {
// do something
@Override
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// do something
} // constructor
} // class TableClientsthis code works well...
But if I implement the javaBeans on more than one Dialogs (windows) and the user uses
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first dialog that run...
If I delete all listener (on the dialog) when the dialog is close then I have not problems
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Thanks!Sorry for not being clear. The error is as follows:
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#getContacts.email#<Br></cfoutput> <!--- --->
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54 :
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You can check the "OLTP Object Type" from transaction code "/n/sapapo/om16" (Ordmap Anchor Table tab).Hello Shohei,
"OLTP Object Type(*)" is of more importance to the external system; surely, it would be assigned after the number is changed by the CIF .
The document is created an send it to R/3 or ECC (if you have publication types, Integration models, etc...); when the external system confirm the document and return it to SCM via CIF, the "OLTP Object Type(*)" should be assigned.
Probably you only have this number for documents working on planning version 000, and not for other planning versions.
At the end: "OLTP Object Type(*)" is decided by the external system, when documents go trough CIF.
Please check the following documentation:
"Order Category in OLTP System
The (OLTP or R/3) order category is used in addition to the order number to identify an order that has been transferred from an external (or R/3) system to the APO system.
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For example, a procurement order (BUS10502) in the APO system can contain both procurement orders (category 2) and purchase requisitions (category 1). In APO, the order category is only used to identify an order in combination with the order number. The category is also used in part to determine if an order/schedule line in the APO system can be changed by a user or not (a purchase order, for example, may no longer be changed, while a purchase requisition may still be changed). Generally, the order category is of more importance to the external system. For example, the R/3 system needs to know whether it is a purchase order or a purchase requisition that is being dealt with.
If an SAP (e.g. R/3) system is not linked to the APO system, and this system is to be used to exchange the order information that requires a certain order category, we recommend that you use the standard values, for example category 2 for business object BUS10502.
Orders that are created within an APO system, for example in a planning run, are not given an (OLTP) order category when created, since they were not transferred to the APO system from an external system. These orders all automatically receive (for example, when they are imported) the order category 8 (APO local order). These orders have an APO internal order category which distinguishes between criteria such as in-house production or external procurement. In a subsequent (optional) step, an external system can then decide whether an order created in APO is a purchase order (category 2) or a purchase requisition (category 1) and assign it an (OLTP) order category and an (external) order number.
You find these values in the documentation of the respective function or of the domain fixed values.
Note that certain functions (for example, configurations) are only possible for certain order categories."
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Green guidelines (when lining objects up / aligning) missing
Hi, as title suggests I no longer get the green guidelines which show when the object I am moving is aligned with the bottom/top/middle etc of another object in my document. Tried a couple of things in 'View' but hasn't seemed to solve the problem - probably being stupid but I haven't got the time to spend ages doing it today! So, yet again, I am here for your help...
Thanks as always,
MarkHi all,
Thanks for swift response. Smart Guides are turned 'on', at least according to the little tick next to where it says 'Smart Guides'.
As an example of what I'm doing, I create a rectangular box and place it anywhere on my page. I then create another rectangular box (or whatever shape). When using Illustrator before, I could move the box and some green lines would indicate when my new box was lined up to an edge or the middle of the first box. It's useful for making sure everything is lined up neatly and accurately, but have no idea where the function has gone.
Is this description any clearer?
Thanks again,
Mark -
I want to know when we issue truncate table statement in oracle .
i want to know when we issue truncate table statement in oracle .No log will be write in redo log .But we can recover data using flashback or scn.I want to know where is the actually truncate table statement log is stored in oracle database.Please explain me in detail step by step .
Hi,
I have truncated table after that i have restored that data.See below the example.I want to know from where it's restored.
From which log file it's restored.
create table mytab (n number, x varchar2(90), d date);
alter table mytab enable row movement;
Table altered.
SQL> insert into mytab values (1,'Monsters of Folk',sysdate);
1 row created.
SQL> insert into mytab values (2,'The Frames',sysdate-1/24);
1 row created.
SQL> commit;
Commit complete.
SQL> select CURRENT_SCN from v$database;
CURRENT_SCN
972383
SQL> select * from mytab;
N
X
D
1
Monsters of Folk
30-DEC-12
2
The Frames
30-DEC-12
N
X
D
SQL> set lines 10000
SQL> /
N X D
1 Monsters of Folk 30-DEC-12
2 The Frames 30-DEC-12
SQL> select to_char(sysdate,'yyyymmdd hh24:mi:ss') from dual;
TO_CHAR(SYSDATE,'
20121230 09:29:24
SQL> set timing on
SQL> truncate table mytab;
Table truncated.
Elapsed: 00:00:15.75
SQL> select * from mytab as of timestamp TO_TIMESTAMP('20121230 09:29:24','yyyymmdd hh24:mi:ss');
N X D
1 Monsters of Folk 30-DEC-12
2 The Frames 30-DEC-12
Elapsed: 00:00:00.28
SQL> insert into mytab select * from mytab as of timestamp TO_TIMESTAMP('20121230 09:29:24','yyyymmdd hh24:mi:ss');
2 rows created.
Elapsed: 00:00:00.01
SQL> -
Error when transforming object data HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Hi
I am running on NW04s. Working on WD for ABAP Interactive forms. whenever I open the Adobe editor thru SFP or Se80, the editor opens up and I am able to do my operations. The moement I hit back button/Save or any other action which involves coming out of the adobe editor, it throws me an Fatal error - <b>Error when transforming object data</b>. I find that in most of the threads there are similar issues which are still open. Any Help would be appreciated.
I have installed ADLC 7.1, xACF04s.
Murali.I did the same installation on another PC, and to my suprise it works fine. Looks very strange
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