Creation of Object in java

Suppose I am having Class Box and I want to create only 50 objects
please give me the code If i exceed above 50th object ie 51 for the class Box I must get an exception
please help me for developing the code for Standalone application

saamer wrote:
Suppose I am having Class Box and I want to create only 50 objects
please give me the code F*ck you. You don't come here and ask for code.
If i exceed above 50th object ie 51 for the class Box I must get an exception Easy problem. Add a static counter to your class and increment it in the ClassBox constructor. When it exceeds the max value throw an exception of your choosing.
%

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How can I trace creation of objects?

I am wondering how I can trace creation of objects with new. For example:
interface CreationListener {
    void objectCreated(Object o);
class CreationNotifier {
    static void registerCreationListener(Class cls, CreationListener listener) {
        // registers `listener' to be notified after creating any object of class `cls'
class Test {
    public static void main(String[] args) {
        CreationNotifier.registerCreationListener(Integer.class, new CreationListener() {
            public void objectCreated(Object o) {
                System.out.println("Created Integer " + ((Integer)o).intValue());
        new Integer(2); // Now I would expect to see `Created Integer 2' on my console...
}In other ways I want to get informed about every object of the specified class that gets created
throughout the application.
Does anyone have an idea about it? I was trying to find something appropriate in SecurityManager
but I failed :(
Please help!

I think you did not understand exactly what I meant. Your solution is only good for classes written by
me and I wanted to catch all object constructions in any class, e.g. one that I have only in a binary form.
Maybe Hashtable is
not the right data structure but I got to go back to
work :-) Let me know if you come up with a better
implementation.
-- Niladri.I created a WeakHashSet class on top of WeakHashMap which uses one static object as a value and really cares only about the keys. In the registrating class I have a HashMap with keys of type Class and values of WeakHashSet. The register method is simple:
public void register(Object o) {
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}This design ensures (because of using WeakHashMap) that I only have live objects in my structure after running GC (in fact, I call System.gc() in methods to find the live objects of a specific class).
As you can see, my only problem is to have the object registration automate for classes that I have not written (and do not have sources).
And using the profiler is not portable (as I guess) - in examples for JProbe they used DLL's and UNIX shared objects. And that requires unusual switches when starting JVM. I would like to have an all-Java language solution as the code fragments which I have described come from a library which I am writing now and I should not make the users of it depend on switches or dynamic libraries...
Anyway, thanks for your good will. :-)

Error in creation of Object Type from XML passed

Hi,
I am facing a problem creating a appropriate a object type for a XML.
Below are the details:
XML Passed
<mer_offer_action_data>
<form_id>
134039588
</form_id>
<action_cd>
OA
</action_cd>
<offer_decline_reason_cd>
</offer_decline_reason_cd>
<start_dt>
</start_dt>
<candidate>
<ds_prs_id>
109315
</ds_prs_id>
<ds_prs_id>
110534
</ds_prs_id>
<ds_prs_id>
110059
</ds_prs_id>
</candidate>
</mer_offer_action_data>
Types Declaration
+CREATE OR REPLACE type MER_OFF_CANDIDATE
AS
OBJECT
DS_PRS_ID NUMBER
CREATE OR REPLACE TYPE MER_OFF_CANDIDATE_t
AS
TABLE OF MER_OFF_CANDIDATE;
CREATE OR REPLACE type MER_OFFER_ACT_DATA
AS
OBJECT
FORM_ID NUMBER,
ACTION_CD VARCHAR2(6),
OFFER_DECLINE_REASON_CD VARCHAR2(6),
START_DT VARCHAR2(11),
CANDIDATE MER_OFF_CANDIDATE_t
CREATE OR REPLACE TYPE MER_OFFER_ACT_DATA_t
AS
TABLE OF MER_OFFER_ACT_DATA;
CREATE OR REPLACE type MER_OFFER_ACTION_DATA
AS
OBJECT
MER_OFF_ACT_DATA MER_OFFER_ACT_DATA_t
/+
My Declaration
+merOffActDataXML xmltype;
merOffActData MER_OFFER_ACTION_DATA := MER_OFFER_ACTION_DATA(MER_OFFER_ACT_DATA_t());+
Inside Pl/SQL block
+-- Converts XML data into user defined type for further processing of data
xmltype.toobject(merOffActDataXML,merOffActData);+
when I run the Pl/Sql block it gives me error
ORA-19031: XML element or attribute FORM_ID does not match any in type ORADBA.MER_OFFER_ACTION_DATA
which means the object type mapping is wrong
I would like to know whether the object type I had created is correct or not.
Thanks for your help
Beda

Bedabrata Patel wrote:
Below are the details:The details except for a description of the problem
I am facing a problem creating a appropriate a object type for a XML.And which error you are getting
Error in creation of Object Type http://download.oracle.com/docs/cd/E11882_01/server.112/e10880/toc.htm
And which version of Oracle you are getting the unknown error creating the unknown problem.

Error in creation of Object Type

Hi,
I am facing a problem creating a appropriate a object type for a XML.
Below are the details:
XML Passed
<mer_offer_action_data>
     <form_id>
          134039588
     </form_id>
     <action_cd>
          OA
     </action_cd>
     <offer_decline_reason_cd>
     </offer_decline_reason_cd>
     <start_dt>
     </start_dt>
     <candidate>
          <ds_prs_id>
               109315
          </ds_prs_id>
          <ds_prs_id>
               110534
          </ds_prs_id>
          <ds_prs_id>
               110059
          </ds_prs_id>
     </candidate>
</mer_offer_action_data>
Types Declaration
+CREATE OR REPLACE type MER_OFF_CANDIDATE
AS
OBJECT
DS_PRS_ID NUMBER
CREATE OR REPLACE TYPE MER_OFF_CANDIDATE_t
AS
TABLE OF MER_OFF_CANDIDATE;
CREATE OR REPLACE type MER_OFFER_ACT_DATA
AS
OBJECT
FORM_ID NUMBER,
ACTION_CD VARCHAR2(6),
OFFER_DECLINE_REASON_CD VARCHAR2(6),
START_DT VARCHAR2(11),
CANDIDATE MER_OFF_CANDIDATE_t
CREATE OR REPLACE TYPE MER_OFFER_ACT_DATA_t
AS
TABLE OF MER_OFFER_ACT_DATA;
CREATE OR REPLACE type MER_OFFER_ACTION_DATA
AS
OBJECT
MER_OFF_ACT_DATA MER_OFFER_ACT_DATA_t
/+
My Declaration
     +merOffActDataXML          xmltype;
     merOffActData          MER_OFFER_ACTION_DATA := MER_OFFER_ACTION_DATA(MER_OFFER_ACT_DATA_t());+
Inside Pl/SQL block
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     xmltype.toobject(merOffActDataXML,merOffActData);+
Thanks for your help
Beda
Edited by: Bedabrata Patel on Jul 12, 2010 5:51 AM

Bedabrata Patel wrote:
Below are the details:The details except for a description of the problem
I am facing a problem creating a appropriate a object type for a XML.And which error you are getting
Error in creation of Object Type http://download.oracle.com/docs/cd/E11882_01/server.112/e10880/toc.htm
And which version of Oracle you are getting the unknown error creating the unknown problem.

Error in Creation of Object ID 00000000 is not allowed

Hi all,
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This is urgent requirement of client.
Thanks,
HR User.

Hi Hr user
Now listen carefully.
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PL/SQL Object Type - Java oracle.jbo.domain

PL/SQL Object Type <-> Java oracle.jbo.domain
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Following scenario:
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|ID|Column1|Column2| multilingual Column |
|--|---------------------------------------|
| |       |       | ------------------- |
| |       |       | | 1 | hello         | |
| |       |       | ------------------- |
|1 | foo   | bar   | | 2 | hallo         | |   <- Row Nr 1
| |       |       | ------------------- |
| |       |       | | 3 | ola           | |
| |       |       | ------------------- |
|--|-------|-------|-----------------------|
| |       |       | ------------------- |
| |       |       | | 1 | world         | |
| |       |       | ------------------- |
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| |       |       | ------------------- |
| |       |       | | 3 | ??? ;-)      | |
| |       |       | ------------------- |
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and
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[196] Executing FAULT-IN...SELECT NR, NAME FROM B_THESAURI BThesauri WHERE NR=:1
[197] SQLException: SQLState(null) vendor code(17074)
[198] java.sql.SQLException: Ungültiges Namensmuster: XMLTEST.null
...snip: detail of stack...
[240] SQLException: SQLState(null) vendor code(17060)
[241] java.sql.SQLException: Deskriptor konnte nicht erstellt werden: Unable to resolve type "null"
...snip: detail of stack...
[280] Warning:No element type set on this array. Assuming java.lang.Object.
(XMLTEST is the name of the schema)
Seems as if the framework can't read the TypeDescriptor or does not know which descriptor to read (XMLTEST.null??)
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Please help, I'm stuck.
Thanks in advance, Christian

Thanks for your suggestion, but it seems to me as if there is one level missing.
in pl/sql I have following structure:
Struct MULTI_LANGUAGE (Object type) - outermost
Array LANGUAGE_TABLE (nested table type)
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on the outermost object type (which holds the array of language fields) I needed to define following 2 methods for direct access:
getContent (langId in number) returns varchar2
setContent (langId in number, langContent in varchar2)
I would like to rebuild the same structure in java, because newly written java code should live in perfect harmony with legacy pl/sql code ;-)
Both applications (Java and pl/sql) have to access the same data as long as migration to java goes on.
Is this nested structure too much for a Domain?
Any other suggestions?
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When sending the list of object containing property with boolean data type, the object on flex side does not show those properties at all. As of there were no boolean properties in that object.
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Flex Object
package com.vo
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Hi Jeffery,
Thanks for your reply, it did solve my query @ point 3 as well as point 2 where the objects in arraycollection were not geting converted and boolean properties did not appear when list of an objects were received. And hey, i did have public functions for properties defined java class, just forgot to mention here in post, sorry for that.
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Waiting for more solutions sooner...
thanks and Regards,
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mmmh i'm not understanding so much....
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Creation of Object in java

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