A problem about bidirectional relationship recovery?

I have read some snippets of AWT source. A snippet as following:
========================================
* The parent of the object. It may be null for top-level components.
* @see #getParent
transient Container parent;
========================================
java.awt.Component and java.awt.Container is a bidirection. But in Component source, the reference to Container is declared as "transient". That means the reference will not been included if the object is serialized. Right?
If I transmit a Container object with some components to remote machine,how does the remote system recover the bidirectional relationship?

A serialized Container recovers its "parenthood" by implementing the method void readObject(ObjectInputStream). If you look at the source you will find the lines:
for(int i = 0; i < ncomponents; i++) {
component.parent = this;

Similar Messages

Problem about space management of archived log files

Dear friends,
I have a problem about space management of archived log files.
my database is Oracle 10g release 1 running in archivelog mode. I use OEM(web based) to config all the backup and recovery settings.
I config "Flash Recovery Area" to do backup and recovery automatically. my daily backup schedule is every night at 2:00am. and my backup setting is "disk settings"--"compressed backup set". the following is the RMAN script:
Daily Script:
run {
allocate channel oem_disk_backup device type disk;
recover copy of database with tag 'ORA$OEM_LEVEL_0';
backup incremental level 1 cumulative copies=1 for recover of copy with tag 'ORA$OEM_LEVEL_0' database;
the retention policy is the second choice, that is "Retain backups that are necessary for a recovery to any time within the specified number of days (point-in-time recovery)". the recovery window is 1 day.
I assign enough space for flash recovery area. my database size is about 2G. I assign 20G as flash recovery area.
now here is the problem, through oracle online manual, it said oracle can manage the flash recovery area automatically, that is, when the space is full, it can delete the obsolete archived log files. but in fact, it never works! whenever the space is full, the database will hang up! besides, the status of archived log files is very strange, for example, it can change "obsolete" stauts from "yes" to "no", and then from "no" to "yes". I really have no idea about this! even though I know oracle usually keep archived files for some longer days than retention policy, but I really don't know why the obsolete status can change automatically. although I can write a schedule job to delete obsolete archived files every day, but I just want to know the reason. my goal is to backup all the files on disk and let oracle automatically manage them.
also, there is another problem about archive mode. I have two oracle 10g databases(release one), the size of db1 is more than 20G, the size of db2 is about 2G. both of them have the same backup and recovery policy, except I assign more flash recovery area for db1. both of them are on archive mode. both of nearly nobody access except for the schedule backup job and sometime I will admin through oem. the strange thing is that the number of archived log files of smaller database, db2, are much bigger than ones of bigger database. also the same situation for the size of the flashback logs for point-in-time recovery. (I enable flashback logging for fast database point-in-time recovery, the flashback retention time is 24 hours.) I found the memory utility of smaller database is higher than bigger database. nearly all the time the smaller database's memory utility keeps more than 99%. while the bigger one's memory utility keeps about 97%. (I enable "Automatic Shared Memory Management" on both databases.) but both database's cup and queue are very low. I'm nearly sure no one hack the databases. so I really have no idea why the same backup and recovery policy will result so different result, especially the smaller one produces more redo logs than bigger one. does there anyone happen to know the reason or how should I do to check the reason?
by the way, I found web based OEM can't reflect the correct database status when the database shutdown abnormally. for example, if the database hang up because of out of flash recovery area, after I assign more flash recovery area space and then restart the database, the OEM usually can't reflect the correct database status. I must restart OEM manually to correctly reflect the current database status. does there anyone know in what situation I should restart OEM to reflect the correct database status?
sorry for the long message, I just want to describe in details to easy diagnosis.
any hint will be greatly appreciated!
Sammy

thank you very much, in fact, my site's oracle never works about managing archive files automatically although I have tried all my best. at last, I made a job running daily to check the archive files and delete them.
thanks again.

Maintaining Bidirectional Relationships

Hi,
Does someone know exactly what "Maintaining Bidirectional Relationships" means.
I'm french and I still have some difficulties to understand properly some stuff.
Then I'd like to understand what it is about.
Thanks

Vladislav,
Bi-directional relationships are ones where two relationships in the model 1:1 or 1:M share the same FK relationship in the database.
EXAMPLE: An Employee may have a collection of PhoneNumbers and each of those PhoneNumbers has a reference back to its Employee.
By default developers must write their domain classes so that both sides of the relationship must be set when changing a relationship of this nature.
When using Bi-directional relationships you would only have to modify one side and the other side would be modified automatically. In the example you would only add a PhoneNumber to an Employee's 1:M collection and the 1:1 back-reference would be automatically set.
NOTE: Indirection is required on both directions and TransaprentIndirection is required on the 1:M.
Doug

Drawback of 'Maintain Bidirectional Relationship'

I recently came to this understanding which changes the way we are trying to use TopLink. I thought I'd share it in an attempt to spare others some of the difficulties we've had, and also to elicit any further clarifications or corrections as necessary.
When you relate two domain objects with TopLink, the Mapping Workbench provides you with the option to Maintain Bidirectional Relationship. What this means is that, for example, if you have two classes Parent and Child, each with a relationship to each other, then all you have to do is call aParent.setChild(aChild) and you will also be able to retrieve the Parent object from the Child with a call to aChild.getParent(), even though you never explicitly called the Child object's setParent(Parent) method. TopLink updates the 'other end' of the relationship for you.
This sounds like a wonderful feature. However, it does have its drawbacks. Let's say that the Child has another Parent, we'll call them ParentOne and ParentTwo. Together, these Parents make up the Child's logical primary key, and so you've mapped these attributes of the Child in TopLink as its primary key attributes. You've also told TopLink to Maintain Birdirectional Relationships between ParentOne.children and Child.parentOne and between ParentTwo.children and Child.parentTwo. Now you've got a particular Child, aChild, owned by Parent instances aParentOne and aParentTwo. You want the Child to be deleted, so you remove it from both of its Parent collections. When you do this, TopLink also removes the references to the Parent objects from aChild, and now you've just altered aChild's primary key. If you selected this Child from the database, TopLink no longer recognizes your instance as the one you selected, and now you're going to have a really hard time deleting it. When you commit your UnitOfWork, you are likely to see an exception that says 'cannot insert null' into one of the LPK fields, or even an OptimisticLockException, as now TopLink is thoroughly confused about what the heck you're doing.
The moral is: Don't use Maintain Bidirectional Relationship on attributes that are part of a class' mapped primary key. And don't set that attribute to null if you want TopLink to continue to recognize the object. In the example above, something like the following would be appropriate:
Child>>
public void orphan(UnitOfWork uow) {
     boolean exists = uow.doesObjectExist(this);
     getParentOne().removeChild(this);
     getParentTwo().removeChild(this);
     if ( exists ) {
          uow.deleteObject(this);
     } else {
          uow.unregisterObject(this);
}Yes, you need to explicitly delete or unregister the object, even if you marked it as Privately Owned by its Parents. The fact that I'm doing the existence check before removing the Child from its Parents is just an extra precaution to make sure I do the test before I do anything that might change the LPK. Although this is probably useless, since, if I do modify the PK, TopLink won't be able to find the object again anyway.

I agree with John's conclusions and will be requesting enhancements to the mapping tools and documentation surrounding b-directional relationships involved in PKs.
One thing I do want to make clear is the original intention of bi-directional relationship support. This was added initially to support EJB 2 relationships. It was also added to the core product for use in some POJO frameworks. It has its uses and does simplify model development but has its trade-offs in addition to what John has posted. It requires indirection in both relationships and the relationship maintenance is only managed when in the context of a TopLink session the objects are read from.
I typically avoid using bi-directional relationship maintenance as the alternative solution of managing the relationships in the model are very straight forward. The result is typically better performing. Additionally, having a POJO model that is not dependent on the persistence manager allows this same model to be used in other contexts such as detachment through serialization.
Also, EJB 3 does not currently have bi-directional relationship management within the specification.
Doug

HT1414 It has some problem about my iphone. When I turn off the phone and then turn on, it shows the screen of apple page and then show the loading page many times. What happen with my iphone?

I have iphone5s and there is some problem about my iphone. I turn off the phone and then I turn on. After I turned on, It showed the page of apple signal and then the page of loading. It used long time to show the loading page. Then it was back to page of apple and then loading page again many times. What happen with it? And what should I do?

Did you already try to reset the phone again by holding the sleep and home button for about 10sec, until the Apple logo comes back again?
If this does not work, try to set it up as new device, explained here:
How to back up your data and set up as a new device
You may have to connect in recovery mode, if the phone is not recognized in iTunes:
iOS: Unable to update or restore

Problem with Rescue and Recovery after installing Norton Internet Security 2010

Hi all.
It's my first time in this forum.
I have a problem, with Rescue and Recovery, after installing Norton Internet Security 2010 on my T43.
The message I get it:
"Rescue and Recovery is unable to back up the file 'C:\Documents and settings\all Users\Application Data\ Norton\ 00000082\00000109\000003c1\cltMLS1.bat' Because the file is either corrupted or being used by another application. Please close any application that could be using the file.
I tried to close the Norton but I couldn't find how.
Tanks
Doron71

Hi and welcome to the forum,
the reason for this situation is, that the antivir files are protected from being modified.
This is the reason, why this file cannot be backed up. I assume, that you would get much more such messages, as there are surelly multiple files files, that are protected like this.
So the solution is to block folders from being archived. Please start RnR application and in the configuration set this folder as the excluded one.
This will skip the backup of this file and will fix your situation.
Please let me know, if you have covered this.
Cheers

An old and difficult problem about "UnsatisfiedLinkError"

Hi dear all,
I have been struck with the problem about "UnsatisfiedLinkError". I have a c++ class HelloWorld with a method hello(), and I want to call it from within a java class. In fact, I have succeeded in calling it on the windows platform. But when I transfer it to linux, the error "UnsatisfiedLinkError" comes out. I have tried to take the measures as Forum has suggested, but it failed.
The source code is very simple to demonstrate JNI.
"HelloWorld.h"
#ifndef INCLUDEDHELLOWORLD_H
#define INCLUDEDHELLOWORLD_H
class HelloWorld
public:
void hello();
#endif
"HelloWorld.cpp"
#include <iostream>
#include "HelloWorld.h"
using namespace std;
void HelloWorld::hello()
cout << "Hello, World!" << endl;
"JHelloWorld.java"
public class JHelloWorld
public native void hello();
static
System.loadLibrary("hellolib");
public static void main(String[] argv)
JHelloWorld hw = new JHelloWorld();
hw.hello();
"JHelloWorld.cpp"
#include <iostream>
#include <jni.h>
#include "HelloWorld.h"
#include "JHelloWorld.h"
JNIEXPORT void JNICALL Java_JHelloWorld_hello (JNIEnv * env, jobject obj)
HelloWorld hw;
hw.hello();
All the files are in the same directory and all the processes are under the dirctory:
1. javac JHelloWorld.java
2. javah -classpath . JHelloWorld
3. g++ -c -I/usr/java/jdk1.3/include -I/usr/java/jdk1.3/include/linux JHelloWorld.cpp HelloWorld.cpp
4. ld -shared -o hellolib.so *.o
5. java -cp . -Djava.library.path=. JHelloWorld
Exception in thread "main" java.lang.UnsatisfiedLinkError: no hellolib in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1349)
at java.lang.Runtime.loadLibrary0(Runtime.java:749)
at java.lang.System.loadLibrary(System.java:820)
at JHelloWorld.<clinit>(JHelloWorld.java:7)
Tried another measure:
i) export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH
ii)java -cp . JHelloWorld
The same error came out as above.
I really don't know what is wrong with it.
Would you like to help me as soon as possible?
Thanks.
Regards,
Johnson

Hi Fabio,
Thanks a lot for your help.
It is very kind of you.
Regards,
Johnson

A problem about calling Labview vi in VB

Hi all:
I meeting a problem about data transfer and parallel operation between VB and Labview.
Actually, I want develop a VB program, in which, the Labview VI can be called and corresponding parameters can be transferred to Labview. and then, I also can operate my system by VB program at same time. something like parallel operation (VB and Labview program).
But the question is :
1. If I use "Call" method of ActiveX in VB, and the LabVIEW subvi is not stopped (for example, a loop structure), I can not do parallel operation on VB program. The error message is "other application is busy" which is attached below. The sample codes is also attached.
2. I tried to use other methods like "OpenFrontPanel" and "Run", but I am not sure how to transfer the parameter??
3. Then I tried to use "SetControlValue" to set the parameters, but there is a error " := expected", which is very strange, because the statement I wrote is followed with the help documents [ eg: VI.SetControlValue ("string", value)], why it is still need a "=" ??
Does anybody know something about it? Thanks a lot
Message Edited by hanwei on 11-07-2008 03:18 PM
Attachments:
vb_labview_error_message_1.JPG ‏14 KB
VB_to_LV.zip ‏10 KB

I sure hope OP has solved it by now.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

HT201210 hi everyone, i have a problem about my iphone 4S, doesn't work with wifi connection and bluetooth since upgrade to the IOS 7.0.3. Can anyone can help me tosolve this problem?????Thank's regards paulus

hi everyone, i have a problem about my iphone 4S, doesn't work with wifi connection and bluetooth since upgrade to the IOS 7.0.3. Can anyone can help me tosolve this problem?????Thank's regards paulus

Try the suggestions here to see if they resolve your problem:
http://support.apple.com/kb/ts1559
If these don't work you may have a hardware problem. Visit an Apple store for an evaluation or contact Apple Support.

Problem about Handling of Empty Files in File Adapter

Hello everyone,
NetWeaver 2004s --- XI
In Sender i have a File Adapter.
Now i meet a problem about Handling of Empty Files. When i send empty file, but don't cerate a leer message.
I have seen following text in help document. But in adapter configuration i can not find the correspond parameter.
can you give me some tips?
Thx in advance
best regards
Yaning
SAP Help Document über File Adapter
+Handling of Empty Files
Specify how empty files (length 0 bytes) are to be handled.
○       Do Not Create Message
No XI messages are created from empty files.
The files are processed according to the selected Processing Mode.
For example, if the processing mode is Delete, empty files are deleted in the source directory.
○       Process Empty Files
XI messages are created with an empty main payload.
The files are processed according to the selected Processing Mode.
○       Skip Empty Files
No XI messages are created from empty files.
Empty files are skipped and remain in the source directory.+
Help Docu

hi,
it's available since Sp19 for XI 3.0
and the corresponding SPS fpr XI 7.0
http://help.sap.com/saphelp_nw04/helpdata/en/44/f565854b7341e6e10000000a1553f6/frameset.htm
so probably you need to install the new SP
Regards,
michal
<a href="/people/michal.krawczyk2/blog/2005/06/28/xipi-faq-frequently-asked-questions"><b>XI / PI FAQ - Frequently Asked Questions</b></a>

Problem about sales order stock stock transfer and batch determination

Hi, experts, I get a problem about sales order stock stock transfer and batch determination.The following is the current situation of my system:
In OMCG I assigned search procedure ME0001 to both 311 and 311 E and ticked check batch. After that, I found that if iI need to tranfer unrestricted-use material from storage location 1000 to 2000 with movement type 311, I just need to input * at the field batch, then the system will display all of the available batches. But for the transferring of sales order stock with movement type 311 E, after I input * at the batch field, no batch is displayed and there is also no message from the system.
Can anybody help me? Is there anything else I need to do? Thanks very much.

I think my question is not clear, actually I tried 562 E , 411 E and 413 already. all the transaction looking for the sales order but unfortunatly the sales order is deleted from SAP.

Hello apple I have the problem with my iPhone and my friends have this problem too. My iPhone have the problem about calling and answer the call. When I use my iPhone to call I can't hear anything from my iPhone but the person that I call can answer it bu

Hello apple
I have the problem with my iPhone and my friends have this problem too.
My iPhone have the problem about calling and answer the call. When I use my iPhone to call I can't hear anything from my iPhone but the person that I call can answer it but when answer both of us can't hear anything and when I put my iPhone to my face the screen is still on and when I quit the phone application and open it again it will automatic call my recent call. And when my friends call me my iPhone didn't show anything even the missed call I'm only know that I missed the call from messages from carrier. Please check these problem I restored my iPhone for 4 time now in this week. I lived in Hatyai, Songkhla,Thailand and many people in my city have this problem.
Who have this problem??

Apple isnt here. this is a user based forum for technical questions. The solution is to restart, reset, and restore as new which is in the manual after that get it replaced for hard ware failure. if your within your one year warranty its replaced if it is out of the warranty then it is 199$

Problem about updating to Mac OS X 10.5.3

Hi there,
I just bought my Macbook two months ago. I encounted a problem about updating it to the latest version of MAC OS X. The system reminded me to restart, I proceed. Everythig looked just fine until a poping up window shown "Mac OS X 10.5.3 pacakage can not be validated". Dose anyone know what did that mean? How can I update my little mac?

Hi Hummer,
First, welcome to Apple discussions.
To answer your question, your computer checks all downloaded updates before installing them. It does this to make sure it's got the entire file and that the update will install correctly. The fact that validation fails on your machine probably means the file did not download correctly.
To install 10.5.3, simply go to this website, download the "10.5.3 combo update" and then run it on your Mac: http://www.apple.com/support/downloads/

Hardware diagnostic shows me a problem about charging battery. What about it ?

Hi.
I bought a MacBook Pro retina 13', mid 14. on last december, and after almost a month I did the hardware test of apple as the Technic support says, and this hardware test shows me a problem about charging battery, so, I wanna know what about it, is it normal ? or is it a battery problem or is it a problem about the Current adaptador ? Thank your for your answers.

Could be battery, could be adaptor, could be the computer itself. You will have to take it in for testing. Fortunately, you are still under warranty.

The problem about vrrp

Dear all,I have a problem about vrrp,my core switch is cisco 3750x and huawei S5700-28C-EI, after I configured vrrp between them,the switch log got the error problem as follow:
*Jan 11 00:01:43.111: %VRRP-6-STATECHANGE: g1/0 Grp 3 state Backup -> Master
*Jan 11 00:01:43.111: VRRP: tbridge_smf_update failed
*Jan 11 00:01:44.187: VRRP: Advertisement from 10.252.200.34 has an incorrect group 10 id for interface g1/0
*Jan 11 00:01:46.539: VRRP: Advertisement from 10.252.200.36 has an incorrect group 10 id for interface g1/0
*Jan 11 00:01:50.323: VRRP: Advertisement from 10.252.200.34 has an incorrect group 10 id for interface g1/0
*Jan 11 00:01:51.707: VRRP: Advertisement from 10.252.200.36 has an incorrect group 10 id for interface g1/0
*Jan 11 00:01:52.079: VRRP: Advertisement from 10.252.200.34 has an incorrect group 10 id for interface g1/0
*Jan 11 00:01:53.079: VRRP: Advertisement from 10.252.200.34 has an incorrect group 10 id for interface g1/0
If cisco and huawei cannot interconnect with each other?

Can you post the interface config from the huawei and cisco device?
HTH,
John
*** Please rate all useful posts ***

A problem about bidirectional relationship recovery?

Similar Messages

Maybe you are looking for