Strange object stream behavior - please help

I have implemented client/server code for a Web application that retrieves check images from a mainframe. The client (on my app server) sends request objects via an ObjectOutputStream to the server component (the image server), where the request is processed to produce a response object, which is then sent back across another ObjectOutputStream to the client. Usually the application works great, but every so often I get the following strange behaviour -
A request object gets to the server and is processed, but then the response object sits on the server and will not return to the client. However, as soon as another request object is sent to the server, the 1st response object immediately returns to the client. Then, the response object for the 2nd request hangs on the server, and so on and so on. The only way I have found to fix this is to reboot the entire machine (Windows NT). Simply restarting my server component will not help.
Usually this will only happen after I have stopped and restarted my server component and then not every time. However, today it seems to have started happening without any restart of the server component which has me very confused.
Any thoughts on what might be causing this strange behaviour would be greatly appreciated. I can post some of my code if absolutely necessary, but since it involves multiple different classes this would probably only serve to confuse.

Wild guess: Does your server do a flush() after
writing the response object?Yes - every time. Besides, as I wrote above, this behaviour doesn't occur all the time, just every so often.

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Message was edited by: zellin

I only have a 'CD Info.cidb' file in the preferences.
Couldn't hurt to drag them on the desktop too, I suppose.
Just don't trash them yet.
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M
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hi friends,
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hi ChuckBing,
Thank you very much, your suggestion helps me a lot...
I change the WeatherReport Class as follows and its working now...
public class WeatherReport implements Serializable,Comparable {
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    private String temp;
    private String desc;
    public int compareTo(Object o) {
        if(o instanceof WeatherReport)
            WeatherReport wp=(WeatherReport)o;
            String l1=wp.getLocation();
            String l2=this.getLocation();
            return l2.compareTo(l1);
        return -1;
}Once Again Thanks a lot ...
Edited by: rajaram on Oct 31, 2007 9:11 PM

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The source code for Client :
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import java.net.*;
import java.util.*;
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import java.net.*;
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You forgot to reset the OOS. ObjetOutputStream keeps a buffer of objects, so if you write the same object again with changes on it, you must reset the buffer.
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JOptionPane.showMessageDialog(null, urlSuffix);
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JOptionPane.showMessageDialog(null, "con = " + con);
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flush() or close() the ObjectOutputStream. There are probably still bytes in the buffer.
- Saish
"My karma ran over your dogma." - Anon

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Thank you for reading this email...
If I have a **DTD** like:
<!ELEMENT person (name, age)>
<!ATTLIST person
     id ID #REQUIRED
>
<!ELEMENT name ((family, given) | (given, family))>
<!ELEMENT age (#PCDATA)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
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<name>
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**** Could you help me to write a simple parser to parse my DTD and XML to Java object, and how can I use those objects... sorry if the problem is too basic, I am a beginner and very stuck... I am very confuse with SAXParserFactory, SAXParser, ParserAdapter and DOM has its own Factory and Parser, so confuse...
Thank you for your help, Yo

Hi, Yo,
Thank you very much for your help. And I Wish you are there...I'm. And I plan to stay - It's sunny and warm here in Honolulu and the waves are up :)
A bit more question for dear people:
In the notes, it's mainly focus on JAXB,
1. Is that mean JAXB is most popular parser for
parsing XML into Java object? With me, definitely. There are essentially 3 technologies that allow you to parse XML documents:
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3) Enter JAXB (or Castor, or ...): You give it a grammar of the XML documents you want to parse, or "unmarshall" as the fashion dictates to call it. (Actually the name isn't that bad, because "parsing" focuses on the input text while "unmarshalling" focuses on the objects you get, even though I'd reason that it should be marshalling that converts into objects and unmarshalling that converts objects to something else, and not vice versa but that's just my opinion.) The JAXB compiler creates a bunch of source files each with one (or now more) class(es) (and now interfaces) that correspond to the elements/tags of your grammar. (Now "compiler" is a true jevel of a misnomer, try to explain to students that after they run the "compiler", they still need to compile the sources the "compiler" generated with the real Java compiler!). Ok, you've got these sources compiled. Now you call one single method, unmarshall() and as a result you get the root node of the hierarchy that corresponds to the XML document. Sounds like DOM, but it's much better - the objects in the resulting tree don't have all the same type, but their type depends on the tag they represent. E.g if there is the tag <ball-game> then there will be an object of type myPackage.BallGame in your data structure. It gets better, if there is <score> inside <ball-game> and you have an object ballGame (of type BallGame) that you can simply call ballGame.getScore() and you get an object of type myPackage.Score. In other words, the child tags become properties of the parent object. Even better, the attributes become properties, too, so as far as your program is concerned there is no difference whether the property value was originally a tag or an attribute. On top of that, you can tell in your schema that the property has an int value - or another primitive type (that's like that in 1.0, in the early release you'll have to do it in the additional xjs file). So this is a very natural way to explore the data structure of the XML document. Of course there are drawbacks, but they are minor: daunting complexity and, as a consequence, very steep learning curve, documentation that leaves much to reader's phantasy - read trial and error - (the user's guide is too simplicistic and the examples too primitive, e.g. they don't even tell you how to make a schema where a tag has only attributes) and reference manual that has ~200 pages full of technicalities and you have to look with magnifying glas for the really usefull stuff, huge number of generated classes, some of which you may not need at all (and in 1.0 the number has doubled because each class has an accompanying interface), etc., etc. But overall, all that pales compared to the drastically improved efficiency of the programmer's efforts, i.e. your time. The time you'll spend learning the intricacies is well spent, you'll learn it once and then it will shorten your programming time all the time you use it. It's like C and Java, Java is order of magnitude more complex, but you'd probably never be sorry you gave up C.
Of course the above essay leaves out lots and lots of detail, but I think that it touches the most important points.
A word about JAXB 1.0 vs. Early Release (EA) version. If you have time, definitively learn 1.0, they are quite different and the main advantage is that the schema combines all the info that you had to formulate in the DTD and in the xjs file when using the EA version. I suggested EA was because you had a DTD already, but in retrospect, you better start from scratch with 1.0. The concepts in 1.0 are here to stay and once your surmounted the learning curve, you'll be glad that you don't have to switch concepts.
When parser job is done,
what kind of Java Object we will get? (String,
InputStream or ...)See above, typically it's an object whose type is defined as a class (and interface in 1.0) within the sources that JABX generates. Or it can be a String or one of the primitive types - you tell the "compiler" in the schema (xjs file in EA) what you want!
2. If we want to use JAXB, we have to contain a
XJS-file? Something like:In EA, yes. In 1.0 no - it's all in the schema.
I am very new to XML, is there any simpler way to get
around them? It has already take me 4 days to find a
simple parser which give it XML and DTD, then return
to me Java objects ... I mean if that kind of parser
exists....It'll take you probably magnitude longer that that to get really familiar with JAXB, but believe me it's worth it. You'll save countless days if not weeks once you'll start developing serious software with it. How long did it take you to learn Java and it's main APIs? You'll either invest the time learning how to use the software others have written, or you invest it writing it yourself. I'll take the former any time. But it's only my opinion...
Jan

I can't read a Object from file, Please help me

i want to write a Object into File. this is code of Object
class objStoreCus implements Comparable, Serializable
String customerID = new String();
String customerName = new String();
String customerEmail = new String();
objStoreCus(String cusID, String cusName, String cusEmail)
customerID = cusID;
customerName = cusName;
customerEmail = cusEmail;
objStoreCus(){}
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objStoreCus oS = new objStoreCus();
oS = (objStoreCus)o;
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private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
try
s.defaultReadObject();
}catch(IOException ie){throw new IOException();}
catch(ClassNotFoundException cnt){throw new ClassNotFoundException();}
And I was wrote above Object into File by this code :+
FileOutputStream fos;
ObjectOutputStream oos;
FileInputStream fis;
ObjectInputStream ois;
public void writeObjToFile(objStoreCus obj)
try
fos = new FileOutputStream("Exrcise3.ex3", true);
}catch(FileNotFoundException fnfe){}
try
oos = new ObjectOutputStream(fos);
//ghi doi tuong vao file
oos.writeObject(obj);
//dong stream
oos.close();
fos.close();
}catch(IOException ie){}
But i can't read above Object from file. allway have a Exception occur "StreamCorruptedException".
this is code read Object form file :
*parameter is ArrayList will be store Object from file.
public void readObjFromFile(ArrayList al)
try
fis = new FileInputStream("Exrcise3.ex3");
}catch(FileNotFoundException fnfe){}
try
ois = new ObjectInputStream(fis);
while(true)
try
objStoreCus osc = new objStoreCus();
osc = (objStoreCus)ois.readObject();
System.out.println(osc.customerEmail);
}catch(Exception e)
e.printStackTrace();
//System.out.println();
break;
ois.close();
fis.close();
}catch(IOException ie){}
}

Problem lies in
os = new FileOutputStream("Exrcise3.ex3", true);
You are trying to append to that file, You should always use new file to serialize objects.
os = new FileOutputStream("Exrcise3.ex3");
Try with above line.

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your problem is your profile is only 750 instead of 3500 which leads to lower throughput/download.
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If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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Does anybody know how I can make a java3d behavior that can modify 2 branchgroups from different scenegraphs, for example the ViewPlatform branchgroup, and the branchgroup of an object in the scenegraph????????
thanks

or maybe a more appropriate question would be:
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We run Zen 6.5 and push down apps and icons to a large number of PCs that are used by patrons.
For many years this all worked fine. But, since a few months ago we had an incredibly tough problem.
From time to time, NAL Objects that are set to "run once" and have _not_ had their version change begin to push to the clients. For example, weeks ago we pushed a patch using a NAL object - this was set to run once and version is set to 0 and worked as expected. Yesterday, Zen started pushing the NAL objects to clients in the middle of the day (clients it had done weeks ago). There are numerous NAL objects for this patch job because we tie them to group and there are about 80 groups - many of the objects were pushed, not just one. If it were one, I would assume human error. Add to that that this has happened before with other NAL objects and I am super stumped.
Is there any thing on the client side that would make it look like it is new to Zen? What else could be causing something like this?

"Run Once" is a bit of a misnomer and does not work as most people expect.
It is really "Run Once Per User Profile on Each Machine".
It is not really run once on a give machine.
Most folks really want it to push just once to the machine.
To really make it run once per machine, you would need to include a
System Requirement that checked something the app pushed like a reg key.
You could even add your own reg key if you like.
On 10/21/2010 8:36 PM, jayhaque wrote:
>
> I am a totally clueless about Novell and ZenWorks and can use some help
> from the forum community.
>
> We run Zen 6.5 and push down apps and icons to a large number of PCs
> that are used by patrons.
> For many years this all worked fine. But, since a few months ago we had
> an incredibly tough problem.
>
> From time to time, NAL Objects that are set to "run once" and have
> _not_ had their version change begin to push to the clients. For
> example, weeks ago we pushed a patch using a NAL object - this was set
> to run once and version is set to 0 and worked as expected. Yesterday,
> Zen started pushing the NAL objects to clients in the middle of the day
> (clients it had done weeks ago). There are numerous NAL objects for this
> patch job because we tie them to group and there are about 80 groups -
> many of the objects were pushed, not just one. If it were one, I would
> assume human error. Add to that that this has happened before with other
> NAL objects and I am super stumped.
>
> Is there any thing on the client side that would make it look like it
> is new to Zen? What else could be causing something like this?
>
>
Craig Wilson - MCNE, MCSE, CCNA
Novell Knowledge Partner
Novell does not officially monitor these forums.
Suggestions/Opinions/Statements made by me are solely my own.
These thoughts may not be shared by either Novell or any rational human.

Strange object stream behavior - please help

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