Java Object and varray

hi
i want to create a java object which maps varray in oracle.i want a solution though SQLData or CustomDatum interfaces.we have a varray of ints.
arun aithal

I think you might find a better audience in the JDBC forum Not only that. It is kind of mandatory here to ridicule lesser languages than PL/SQL and SQL and make fun of people not using Oracle RDBMS. ;-)

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XML to java object AND Performance

Hi,
I read some article about marshalling a XML file to Java Object (like Castor, XML Beans projects...)
To resume: I would like to marshal a XML doc (from XML to Java object. Later I would like to put these objects on a SGBD...). Unfortenaly I suppose that approach is to expensive on term of performance? Supposing that my xml doc contain 100 data's occurances, XML bean woulkd create 100 objects corresponding. My problem is that I don't want that the all 100 objects live in the same time on memory. For example, my code will read sequential, the xml occurances (like a Sax parser), create 10 datas objects (standby), put these in the data base, and destroy these objects before...iteratively create the next 10 objects...
It is possible ? Can anybody help me?
Thank

On the article: Java Architecture for XML Binding (JAXB)
(http://java.sun.com/developer/technicalArticles/WebServices/jaxb/)
I found maybe a response?
"...in other words, you can do a SAX parse of a document and then pass the events to JAXB for unmarshalling. "
But somebody could help me to write the code to do that?

Logging Java objects and threads. Application sampling.

I am using a laptop to run my application on. It uses windows XP and it is the only application running on that machine. I use TCP and serial port to communicate to other devices. My application is supposed to use up to 300M of memory but apparently it using much more than that. The laptop physical memory size is 512M. I am wondering if there is a way to sample my application periodically. What I mean by that is, after the applications runs I want to run at the same time kind of profiler that every, let us say, 10 minutes logs the number of objects created and what those objects are or what the current ones are. The number of threads running and what are their names. I want to know what is using all of this memory. The memory usage goes up to about 420M. As a result, the application throws out of memory exception. I believe I can get the number of threads running but do not know how to get their names. I need to know all of that so I would go into my code and see where it is happening and try to solve the problem. One of the ways I have in my mind now is to put a print out everywhere I create an object or thread, but that�s very expensive. Any hints or tips could be useful.
Thank you in advance.
P.S.:
I do not want to run a profiler such as JProfiler because the application is running live and I do not have access to it. I want to embed these logs into the application itself and rerun it on a live system.

As a first thought, I'm guessing that you're merely thinking that your program will not exceed 300 megabytes just based on the -Xmx300M command you may be passing your program. This is a max heap size, not the max footprint your program will take. Be aware that this can go beyond the scope of 300 MB....
Now, if you want very detailed information about processes, memory usage, etc, you might be able to keep track of it yourself, but if you want this information from a system-level sort of thing you will not get it, as one of the major points of Java is that it does not care about a lot of system specifics.
Now, if you're really interested in keeping track of threads, I don't see why you could not just write to a log file every time you spawn a new thread of a particular kind.

Question about java objects and handles?

Let me see if I can explain what I have. Inside my originating Java code, I create an object, let's call it object A, from a class I that I DON'T have the source for. It's not my class. Object A in turn creates an object, let's call it Object B, from a class I don't have the source for. Then Object A creates another object, let's call it Object C, that I DO have the source for, and passes it the reference to Object B that it created. My question is this: In my originating Java code, how do I get a reference to Object B? Or, how can I get the reference to Object C, which would allow me to get the reference to Object B?
Hope everyone understands that?

Thanks for the reply. Perhaps I should have mentioned that Object A does not have a method to return a referenece to Objects B and C. That's my problem. Was just wondering if there is some other way to obtain those refereneces. The reason I mentioned that I don't have the source code for Object A is because if I did, I could obviously write a method that would return me the references.
I'm not new to Java, nor am I an expert either. I'm pretty well up-to-speed on object oriented design though.
I'll provide more specifics on my problem just in case there is a solution to my problem. My code (class) is attempting to establish a connection with a mainframe computer through a web server portal using terminal emulation software provided by a 3rd party vendor. They provide an SDK that contains all the java classes necessary to establsih the connection. To establish the connection, you are required to build a java Properties object that contains all the parameters for the connection (host id, etc.) and pass that properties object to the constructor for the "Object A" class. That object actually establishes the session object using the parameters object you pass it. The session gets displayed in a standalone Applet ("Object A" class extends Applet). You can click on the applet, sign in to the system, and do whatever just fine using your keyboard. However, I wish to send commands to the session from my originating java code. The session object has a method to send commands to the session, but to do that, I need a handle to the session object that was created. I don't have that, and it appears they don't provide a method to get that. Looks like the vendor's intent was just for the user to interface with the session/Applet via the keyboard.

How to create and instance of Java Object from an XML Document.

Hi,
How can we use a XML Document to create an instance of Java Object and do vice versa ie from the Java Object creating the XML Document.
XML Document is available in the form of a String Object.
Are there helper class available to achieve this.
I need to do this in a Servlet.
Regards
Pramod.

JAXB is part of JavaSE while Xmlbeans claims full schema support and full infoset fidelity.
If the standard APIs do all that you need well then use them.

Declare and initialize a varray of collection Object and pass it as OUT Par

Hi ,
How to declare and initialize a varray of collection Object and pass it as OUT Parameter to a procedure.
Following is the Object and VARRAY Type 's I have created and trying to pass the EmployeeList varray type variable as an OUT parameter to my stored procedure, but it is not working. I tried different possibilities of declaring and initializing the varray type variable but it did not work. Any help would be appreciated.
CREATE TYPE Employee IS Object
          employeeId     Number,
          employeeName VARCHAR2(31),
          employeeType     VARCHAR2(20),
CREATE TYPE EmployeeList IS VARRAY(100) OF Employee;
/* Procedure execution block */
declare
employees EmployeeList;
begin
EXECUTE displayEmployeeDetails(100, employees);
end;
Thanks in advance,
Raghu.

but it is not workingWhat's the definition of not working?
Error messages are always helpful.
SQL> CREATE OR REPLACE TYPE Employee IS Object
2 (
3 employeeId Number,
4 employeeName VARCHAR2(31),
5 employeeType VARCHAR2(30)
6 );
7 /
Type created.
SQL>
SQL> CREATE OR REPLACE TYPE EmployeeList IS VARRAY(100) OF Employee;
2 /
Type created.
SQL> CREATE OR REPLACE PROCEDURE getEmployeeDetails (
2    o_employees OUT employeelist
3 )
4 AS
5 BEGIN
6   o_employees := employeelist();
7   o_employees.EXTEND;
8   o_employees(1) := employee(1,'Penry','Mild Mannered Janitor');
9 END;
10 /
Procedure created.
SQL> set serveroutput on
SQL> declare
2   employees employeelist;
3 begin
4   getemployeedetails(employees);
5   for i in 1 .. employees.count
6   loop
7    dbms_output.put_line(employees(i).employeeid||' '||
8                         employees(i).employeename||' '||
9                         employees(i).employeetype);
10   end loop;
11 end;
12 /
1 Penry Mild Mannered Janitor
PL/SQL procedure successfully completed.
SQL>

Invoking a AXIS Web Service with a Java object as input argument

Hi
I've been trying to execute a bpel process that invokes a web service deployed through axis.
This web service takes a java object as input argument as opposed to data types that are directly mapped to java types through the SOAP engine.
I deployed and tested the service outside of BPEL using a test client class. Everything works well.
When I try to configure the "Assign" and "Invoke" activities so that service can be invoked, I cannot see the data structure through the variable picker and I see the following message:
"The element {urn:ComplexTypeWebService}TimeSheetBean is not know to the schema container. Perhaps a schema file that uses it needs to include or import its definition.There mat also be an XML schema issue (non resolvable schema) which prevents {urn:ComplexTypeWebService}TimeSheetBean from being seen by the schema processor."
Is there any example that demonstrates how to invoke an axis web service in such scenario? What am I doing wrong?
Please, let me know.

The passing of Java objects in and out of a web service is NOT supported. variables must be xml documents defined by a XML schema. In my opinion, missing Java object and WSDL is not a good idea. -Edwin

Calling Web Service Proxy with Custom java Object as parameter

I created a web service proxy from WSDL URL using JDeveloper 11g(.5 version)
I need to call a webservice method which takes custom Java Object( Ex: ABC.java) as Input parameter. It creates the XSD java (ABC.java) file for that.
@XmlElementRef(name = "abc", namespace = "http://impl.service.ns.test", type = JAXBElement.class)
protected JAXBElement<ABC> abc;
ABC.java has a property of type java.util.Set of a custom Java Object (Set<XYZ.class>)
It doesn't create xsd file for XYZ.java.
@XmlElementRef(name = "XYZ", namespace = "http://model.ns.test/xsd", type = JAXBElement.class)
protected JAXBElement<Set> xyz;
Please help me.

The passing of Java objects in and out of a web service is NOT supported. variables must be xml documents defined by a XML schema. In my opinion, missing Java object and WSDL is not a good idea. -Edwin

How to parse XML to Java object... please help really stuck

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)>
the **XML** like:
<person id="a1">
<name>
     <family> Yoshi </family>
     <given> Samurai </given>
</name>
<age> 21 </age>
</person>
**** 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:
1) "Callbacks" (e.g. SAX in JAXP): You write a class that overrides 3 methods that will be called i) whenever the parser encounters a start tag, ii) an end tag, or iii) PCDATA. Drawback: You have to figure out where the heck in the document hierarchy you are when such a callback happens, because the same method is called on EACH start tag and similarly for the end tag and the PCDATA. You have to create the objects and put them into your own data structure - it's very tedious, but you have complete control. (Well, more or less.)
2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
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

How to create new java objects in native methods?

Hello,
Is it possible to create java objects and return the same to the java code from a native method?
Also is it possible to pass java objects other than String objects (for example, Vector objects) as parameters to native methods and is it possible to return such objects back to the java code?
If so how can I access those objects (say for example, accessing Vector elements) inside the native code?
What should I do in order to achieve them?
Regards,
Satish

bschauwe is correct in that constructing Java objects and calling methods on Java objects from native code is tough and takes some study. While you're at it, you might want to check out Jace, http://jace.reyelts.com/jace. It's a free open-source toolkit that really takes the nastiness out of doing this sort of stuff. For example,/**
* A C++ function that takes a java.util.Vector and plays around with it.
public void useVector( java::util::Vector& vector ) {
// Print out all the contents of the vector
for ( Iterator it = vector.iterator(); it.hasNext(); ) {
cout << it.next();
// Add some new elements to the vector
vector.addElement( "Hello" );
vector.addElement( "world" );
} All this code just results in calls to standard JNI functions like FindClass, NewObject, GetMethodID, NewStringUTF, CallObjectMethod, etc...
God bless,
-Toby Reyelts

Database access from flex thro java objects

Please tell me how to access the data from the MS SQL server
through a java object and connect it to flex and display the data
in flex.
please provide me the code for this assignment.
Thanks in Advance.
Selvakumar.

What would you consider when choosing between FDS and PHP
(via HTTP) for mySQL communication?
My app doesn't need to be real time but I am concerned about
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How to use Java NIO to implement disk cache for serialized java objects

Hi,
I have a cache (implemented as hahstable etc.) that contains java objects (mostly strings) and swaps objects from runtime memory to the disk and back based on some algorithms. Currently, the reading and writing from the disk is implemented using java.io.* package i.e. fileInputstream and FileOutputStream. Essentially, I serialize the java object and write to the disk and the deserialize and give it back to the Hashtable cache.
The performance of swapping from disk to memory is kinda slow. I have read that memory mapping would improve the performance.
My idea is to do the following:
Have one big file mapped to memory. I write the serialized objects to different portions of the file and then read those portions when needed. I can use the MappedByteBuffer for that but then I have the following questions. I will not store objects in the hashtable anymore.
1. How do I delete things from the cache in the above design i.e. how do I delete portions of a mapped file?
2. How do I serialize objects using ByteBuffers and then deserialize them? I guess this shouldn't be hard but just want to confirm.
Do you think this is the right design or should I change? Right now using the old io package, I have a separate file for each object. When using the NIO package, I want to store all objects in a single file in different portions of the file, is that the right way to go?
As you can see, I am beginner in memory mapped io and need help.

Have one big file mapped to memory. I write the serialized objects to different portions of the file and then read those portions when needed. I can use the MappedByteBufferThis is a good idea, one that I have worked on. It involves quite a bit of manipulation with temporary buffers and a deep working knowledge of object serialization.
1. How do I delete things from the cache in the above design i.e. how do I delete portions of a mapped file?The best way to handle this is do a two-step process, cutting the file into two pieces and gluing it back together where the original one is...
2. How do I serialize objects using ByteBuffers and then deserialize them? I guess this shouldn't be hard but just want to confirm.It is hard. Wrapping the streams and making the IO work properly is not the challenge however. The hard part comes in hacking the object streams. The object input/output streams use a ClassDescriptor object which only gets written once/ read once. This shouldn't be a problem if you will read/write the entire file at once, but will bring you grief if you want random access to your objects. You will also need an indexing mechanism to support random access.
Do you think this is the right design or should I change? Right now using the old io package, I have a separate file for each object. When using the NIO package, I want to store all objects in a single file in different portions of the file, is that the right way to go?I guess it depends on your needs. Do you require random access to objects? NIO provides some performance gains, but mostly for very large amounts of data (>10M in my experience).
You can always write all your objects into the same file using normal io techniques and you can still generate an index and acheive random access. It might be easier...
Good luck

Java Object in javascript

How can i call a java object and use it inside javascript?
For example if i instantiate an integer in a java class, i want to pass it to javascript, do some work on it like for example incrementing it, and then i want to return its value.
Can i do this?

why don't you write javascript code using jsp and then pass on the value to javascript variable.

Accessing Java Object with out any application servers

Hi,
I would be much thankful if any one guide/suggest me how to
access an java object with out using any application servers.I am
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contains some text fields. My plan was to access the java object
and put the dummy data in the text fields. I am using RemoteObject
for this. I am not able to proceed further. Please help me.
Thanks in advance
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You can check The Merapi Project it's still in the
development phase but it'll allow to an AIR app invoke a java class
and run it as it were inside your app. But that's something you
can't take into production yet, why don't u wanna use a server
backend?

Writing a java Object?

I am first time to write a java object,and i found it is difficult to understand some syntax, can anyone give me some suggestion?

My steps as a beginning Java programmer involves the following:
1. Get a simple beginner book on Object Oriented concepts.
The SUN site has a Tutorial.
2. Get a good Java Language book. The Sun Site Tutorial has
similar. Read as much of it as you can take. Then stop.
3. Install Java standard edition compiler. Free from SUN site.
Be able to do "javac xxxx.class" <--- compiling, and
"java xxxx " <-- running xxxx.
4. Compile and run a few of the examples in the books, and
Tutorial.
5. Give yourself a few simple "Program or project" to write,
ex. "Hello World". Right now I am giving myself a simple
problem. Finding word from a string. Or a simple word
parser. Try to write that.
6. Post your questions in the Beginner Forum (Here). Try
out the responses from the more experienced repliers.
7. Got back to the book, and check the section relating
to the response, and your errors. This 2nd round of
checking and reading, helps the Concept and understanding
JAVA.
8. Keep doing this day after day. You'll see that, as it turns out,
JAVA does make sense.
-- gte99te

Java Object and varray

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