LARGE OBJECT IN JAVA

HI GUYS !!
I HAVE A PROBLEM INSERTING BLOB(IMAGES)
INTO DATABASE AND SELECTING BLOB FROM THE DATABASE
USING JCREATOR I HAVE ERRORS IMPORTING ORACLE PACKAGES
IT'S LIKE IT DOES NOT RECOGNISE THE ORACLE PACKAGES
ONE MORE THING
DO ANY BODY KNOWS HOW TO TRANSFERT DATA FROM AN APPLICATION TO AN OTHER
I'M TRYING TO SELECT THE LOCATION USING CHECK BOX ON ONE APPLICATION
AND THEN DISPLAY THE THE CATEGORY OF THE HOUSES(HOUSE, TOWNHOUSE.....)
FROM THE LOCATION TO AN OTHER APPLICATION WHICH WILL HAVE THE TYPE OF HOUSES AND THE PRICES
SELECT THE CATEGORY OF THE HOUSE AND THE AVERAGE PRICE WILL TAKE YOU TO AN OTHER APPLICATION WHICH WILL DISPLAY ALL THE HOUSES UNDER THAT CATEGORY AND PRICE SO WHEN YOU CLICK ON ONE HOUSE
IT WILL TAKE YOU TO AN OTHER APPLICATION WHICH WILL GIVES YOU
ALL THE DESCRIPTION FOR THAT CATEGORY OF HOUSE(EX NUMBER OF ROOMS.....ETC)
SO HOW CAN I TRANSFERT DATA FROM APPLICATION TO AN OTHER
AND THEN SELECTING THE BLOB FROM THE DATABASE TO DISPLAY THE IMAGE OF THE HOUSE
THANK YOU EVERY ONE.
[email protected]

Please do not use all caps

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Serializing large objects

Dear All,
I am trying to serialize a HashMap containing Strings as keys and and ArrayLists as values. This works fine when the number of entries is small, but does not work when the number of entries are really large, in which case an java.lang.OutOfMemoryError: Java heap space is thrown. This happens when the number of entries is about 50,000 and the total number of objects stored in the lists exceed 500,000.
Some posts suggest that this should have been fixed in Java 1.6 but it still doesn't seem to work. Do I need to provide the "-mx" flag to get this to work, or is there another way to serialize large objects? Any thoughts welcome.
Cheers,
Fred

How about implementing custom serialization (by implementing Externalizable), and writing the values as zippied entries. As keys are strings, they can be easily zipped and the array list values should be zipped. Is it possible? ...am I crazy????. Just give it a try :-)

An effective way to compress Large Object Heap

I think I've found an effective way to compress LOH:
If CLR always alloc every large object at the beginning of a RAM page(usually 4KB per page)，then the large object heap(LOH) can be compressed without much
cost: CLR can compress LOH by modifying RAM page table and TLB instead of copying data. If so, small fragmentation maybe still exist (less then a memory page size per fragment), but there would be no large fragmentation, and compressing would be very fast
because of no copying. To do this, OS support may be needed, fortunately Windows OS and Visual Studio are both Microsoft's softwares, so Microsoft can implement this at least on Windows.

I suspect that this technique is already used in a 3rd party implementation of Java. It was briefly mentioned in a discussion about alternative GCs for CoreCLR:
https://github.com/dotnet/coreclr/issues/430
In any case, feel free to open a specific issue in the CoreCLR GitHub repository about this. Implementing an entirely new GC is a lot of work but simply improving the existing one might be another story. Though the fact that it requires kernel
support doesn't help, it may be done but it will have to wait until the kernel guys implement support for it and that will take time. There may also be legal problems if someone has a patent for such a technique.
Regarding performance: modifying page tables has a certain cost. It's possible to find that for smaller blocks it's faster to just copy the block than to modify the page tables. An implementation would probably have to employ a mix of memory copying and
page table modification and in that case you don't even need to require that objects are allocated on a page boundary. Keep in mind that it's not required to deal with one object at a time, there may be consecutive live objects that can be copied in one go.
As for Joel ramblings, well:
"I have a master in computer science and know the speed of the algorithm of compacting a large heap."
Given that you have a history of misleading/inaccurate/confusing claims such a statement is priceless. I suppose that during your master courses you were never taught basic data structures and as result you don't know that hashtable searches are O(1)
and that sorting does help with searching:
https://social.msdn.microsoft.com/Forums/en-US/09a3116a-9626-401f-8c45-c0e8b09da69c/fastest-search-algorithm?forum=csharpgeneral
In this particular case you seem to confuse the term heap as used in GC with the heap data structure. Great.
Thank you! I have opened a specific issue in the CoreCLR GitHub repository about this: https://github.com/dotnet/coreclr/issues/555

PL/SQL Object Type - Java oracle.jbo.domain

PL/SQL Object Type <-> Java oracle.jbo.domain
can anybody help me, getting my domains to work?
Following scenario:
in pl/sql we have an object type called MULTI_LANGUAGE. This type is used for storing multilingual texts as nested table in one(!) column.
So the object MULTI_LANGUAGE contains a member variable LANGUAGE_COLLECTION of type LANGUAGE_TABLE, which itself is a nested table of objects
of the type LANGUAGE_FIELD (this again is only a language id and the corresponding content)
Also the methods setContent(langID, langContent) and getContent(langId) are defined on Object MULTI_LANGUAGE.
For example: Table having primary key, 2 other columns and one column of object type MULTI_LANGAGE (=nested table of objects)
|ID|Column1|Column2| multilingual Column |
|--|---------------------------------------|
| |       |       | ------------------- |
| |       |       | | 1 | hello         | |
| |       |       | ------------------- |
|1 | foo   | bar   | | 2 | hallo         | |   <- Row Nr 1
| |       |       | ------------------- |
| |       |       | | 3 | ola           | |
| |       |       | ------------------- |
|--|-------|-------|-----------------------|
| |       |       | ------------------- |
| |       |       | | 1 | world         | |
| |       |       | ------------------- |
|2 | abc   | def   | | 2 | welt          | |   <- Row Nr 2
| |       |       | ------------------- |
| |       |       | | 3 | ??? ;-)      | |
| |       |       | ------------------- |
|--|-------|-------|-----------------------|Now i've tried to modell this structure as an oracle.jbo.domain.
class MultiLanguage extends Struct having this StructureDef:
attrs[(0)] = new DomainAttributeDef("LanguageColl", "LANGUAGE_COLL", 0, oracle.jbo.domain.Array.class, 2003, "ARRAY", -127, 0, false, "campusonlinepkg.common.LanguageField");
and
class LanguageField extends Struct having this StructureDef:
attrs[(0)] = new DomainAttributeDef("Id", "ID", 0, oracle.jbo.domain.Number.class, 2, "NUMERIC", -127, 0, false);
attrs[(1)] = new DomainAttributeDef("Content", "CONTENT", 1, java.lang.String.class, 12, "VARCHAR", -127, 4000, false);
Is there anything wrong with this StructureDef?
When running the BC-Browser with -Djbo.debugoutput=console -Djbo.jdbc.driver.verbose=true parameters I get suspect warnings when browsing the records
[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??)
Do I have to implement my own JboTypeMap?
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)
    Struct LANGUAGE_FIELD (Object type simple) - innermostthe reason why i had to wrap another struct around the array was because it is not possible to define methods on a nested table. this is only possible on objects.
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?
Thanks again, Christian

How to manipulate a javascript object in java?

Hi, I am fiddling with the java scripting interface. As I understand the rhino engine is packaged with the jdk but what I don't understand is how does one reconcile the objects one gets from their engine (e.g. sun.org.mozilla.javascript.internal.ScriptableObject) versus the ones in the rhino api (e.g. org.mozilla.javascript.ScriptableObject)?
Is the one in the jdk heavily modified or wrappered up to suit their javax.scripting interface?
More specifically, how do I manipulate javascript objects from java?
e.g. suppose I have this java code:
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine js = mgr.getEngineByName("js");
jsEngine.eval("var foo = { x : 1, y : 'hello', z : false };");
Object o = jsEngine.get("foo");Now o is instanceof sun.org.mozilla.javascript.internal.NativeObject, which is a subclass of a bunch of other classes in the s.o.m.j.i namespace. Being internal I can't use these directly.
Looking at the Rhino API obviously you normally get a org.mozilla.javascript.ScriptableObject and can call the .get() .getIds() methods. But I don't know how to translate the objects I am getting in my actual java code which uses the jdk engine into org.mozilla.javascript objects.
Is this even possible? Am I misunderstanding something completely? Should I just be using the rhino js jar and not the javax.scripting interface? If so, for what reason is the javax.scripting interface implemented?

Assuming that you DO want a deep copy, begin with a constructor that takes another hand.
public Hand( Hand h ) { ...Then for each instance variable, within that constructor:
this.instVar0 = h.instVar0;
this.instVar1 = h.instVar1;
. . .And last, for every reference, make sure there is a constructor (or copy method for arrays) that itself makes a deep copy:
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Issues in mapping objects from java to flex - using flex4

Hi,
I have a class in java which i want to send to flex4 using BlazeDS as middleware. There are a few issues that i am facing and they are:
When sending the object across (java to flex), the properties with boolean data type having value as true gets converted to properties with value as false. Even after setting the value to true it still comes as false on flex side. Can't understand why this is happening.
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.
Last but not the least, When sending List<ContractFilterVO> contractFilterVOs to flex using remote call, the result typecasted to ArrayCollection does not show the holding objects as ContractFilterVOs but as plain default Object though having all the properties send, except the boolean one mentioned in above points. Basically it is not able to typecast the objects in arraycoolection but the same objects gets typecasted when sent individually.
In all the above points i am using Remote Service through BlazeDS for connectivity with Java. I have done a lot of this stuff in Flex 3 but doing it for the first time in flex 4, is there anything that Flex 4 needs specific. Below is the pasted code for reference purpose.
Flex Object
package com.vo
     [RemoteClass(alias="com.vo.ContractFilterVO")]
public class ContractFilterVO{
     public function ContractFilterVO(){
     public var contractCode:String;
     public var contractDescription:String;
     public var isIndexation:Boolean;
     public var isAdditional:Boolean;
* Rmote Part of code
var remoteObject:RemoteObject = new RemoteObject();
remoteObject.destination="testService";
remoteObject.addEventListener(ResultEvent.Result,handleResult);
public function handleResult(event:ResultEvent):void{
     var contarctFilterVOs:ArrayCollection = event.result as ArrayCollection; //Point 2&3 probelem, if list sent form java
     var contarctFilterVO:ContractFilterVO= event.result as ContractFilterVO; //Point 1 probelem, if only single Object of type ContractFilterVO sent form java
Java Object
package com.vo
public class ContractFilterVO implements Serializable
     public function ContractFilterVO(){
     private static final long serialVersionUID = 8067201720546217193L;
     private String contractCode;
     private String contractDescription;
     private Boolean isIndexation;
     private Boolean isAdditional;
I don't understand what is wron in my code on either side, it looks syntactically right. It would be great anyone could help me point out my mistake here. Waiting for right solutions...
Thanks and Regards,
Jigar

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.
The solution you gave was right, but than what if i have a VO which has multiple List of objects coming from Java, than i would have to create an instance of each type of object on flex side this is too tedious, is'nt it? Is there any better solution... out there.
And jeffery do you some tricks up your sleeve for this Boolean issues to that i am facing in point 1... Still struggling with this one...
Anyone out there would be more than welcome to point my mistake, if any and provide tips/tricks or solutions...
Thanks again to Jeffery...
Waiting for more solutions sooner...
thanks and Regards,
Jigar

Manipulating C++ Objects in Java Through JNI

Hi,
I have some existing C++ classes objects that I would like to access through Java methods. However, if I use a java method to create an instance of a C++ object, and then I want to edit the state of that C++ object through java, how do I reference the correct C++ object.
For example, if I have a C++ object called Ball, with two variables x and y representing its position and a constructor as well as set methods to set x and y. I then make a java class Ball with the same variables, constructor, and setter methods. But when the java constructor is called, I want the C++ version to be created, and when the java setter methods are called, I want the x and y of the correct C++ Ball instance to change.
Is this is possible, and if so what are the steps needed?
Thank you

See example with C++ structure in
http://www.sharewareplaza.com/Java-Platform-Invoke-API-Demo-version-download_49212.html

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can anyone explain whether ABAP proxy object and JAVA proxy objects can communicate with each others?
if yes then how???

JCO connectors would be able to do the trick here i guess
regards
krishna

How to send data to bam data object through java code

how to send data to bam data object through java code

I've made a suggestion in other thread: https://forums.oracle.com/thread/2560276
You can invoke BAM Webservices (Using Oracle BAM Web Services) or use JMS integration using Enterprise Message Sources (http://docs.oracle.com/cd/E17904_01/integration.1111/e10224/bam_ent_msg_sources.htm)
Regards
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How to use Oracle objects in java code

Hi all!
I'm reading an xls and i need to fill me oracle objects with java code:
OBJECT_NAME OBJECT_TYPE
LETTURA_OBJ TYPE
LETTURA_OBJ TYPE BODY
In the past weeks i've been using both java code into oracle and oracle objects, but new i need to write those objects with data i read with java, anybody can help me?
I know that the easiest work around would be to put the data i read from the excel file into a table and then fill the oracle objects, but now i want to learn how to write directly those objects with a command like the following one:
a sample of the code i'm tryng to write:
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED REPORT."Manage_Excel_ASMBS" AS
import java.io.*;
import java.io.IOException;
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Edited by: LinoPisto on 16-mag-2011 16.38

mmmh i'm not understanding so much....
well... as i told before i'm working in oracle database environment and i'm developing a java procedure.
now, i have this object
CREATE OR REPLACE
TYPE REPORT.FATTURA_OBJ AS OBJECT (
POD VARCHAR2(1000),
ID_FATTURA NUMBER,
ID_FILE NUMBER,
COERENZA_EA_F VARCHAR2(1000),
COERENZA_ER_F VARCHAR2(1000),
COERENZA_EA_M VARCHAR2(1000),
COERENZA_EF_M VARCHAR2(1000),
ANOMALIA VARCHAR2(1000),
MOTIVO_INVALIDAZIONE VARCHAR2(1000),
MATRICOLA_CONTATORE VARCHAR2(1000),
POTENZA_DISPONIBILE VARCHAR2(1000),
MEMBER PROCEDURE pulisci
/and i need to work with it inside this procedure:
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED REPORT."Manage_Excel_ASMBS" AS
import java.io.*;
import java.io.IOException;
import java.io.StringWriter;
public class Manage_Excel_ASMBS
public static void read_Excel(String inputFile,int var_Id_Caricamento, int var_Id_Distributore, String var_Distributore) throws SQLException, IOException
**here i need to put what i'm reading inside the excel file into oracle objects**
/can you please give me a sample ?
thanks

Returning objects from Java stored procedures

I need to pass an object from Java to a Java SP which updates the object and returns the object back. The Java SP will be calling a PL/SQL procedure which returns some nested tables that I want to stick into the passed object.
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I am trying to use custom object classes. I have setup a type map for the connection and my custom class implements SQLData. Yet, when my client tries to call the Java SP, it gets ORA-00932 complaining of inconsistent data types (expected IN conversion failed).
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JPA2 - downloading large objects from database

Hi,
I would like to enable user to download large (up to 20Mb) files, stored in Oracle database.
I think I should use a stream, but I don't know how to get JPA to return a stream of Large Object. Can you help?
I'm using EclipseLink.

Hello,
http://wiki.eclipse.org/EclipseLink/Examples/JPA/Pagination#Using_a_ScrollableCursor describes using a scrollable cursor to return entities. Since this is going through JPA (you didn't mention what api you are using to access EclipseLink) you will want to be careful to manage/clear your cache appropriately so it does not use all your available memory. You will probably want to make this query read-only, and clear the cache after a few iterations using em.clear().
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Chris

How to use bean objects in java script

function insertRow()
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mmmh i'm not understanding so much....
well... as i told before i'm working in oracle database environment and i'm developing a java procedure.
now, i have this object
CREATE OR REPLACE
TYPE REPORT.FATTURA_OBJ AS OBJECT (
POD VARCHAR2(1000),
ID_FATTURA NUMBER,
ID_FILE NUMBER,
COERENZA_EA_F VARCHAR2(1000),
COERENZA_ER_F VARCHAR2(1000),
COERENZA_EA_M VARCHAR2(1000),
COERENZA_EF_M VARCHAR2(1000),
ANOMALIA VARCHAR2(1000),
MOTIVO_INVALIDAZIONE VARCHAR2(1000),
MATRICOLA_CONTATORE VARCHAR2(1000),
POTENZA_DISPONIBILE VARCHAR2(1000),
MEMBER PROCEDURE pulisci
/and i need to work with it inside this procedure:
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED REPORT."Manage_Excel_ASMBS" AS
import java.io.*;
import java.io.IOException;
import java.io.StringWriter;
public class Manage_Excel_ASMBS
public static void read_Excel(String inputFile,int var_Id_Caricamento, int var_Id_Distributore, String var_Distributore) throws SQLException, IOException
          **here i need to put what i'm reading inside the excel file into oracle objects**
/can you please give me a sample ?
thanks

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Hi,
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2) Trigger
3) Dbms_space_admin
4) DBMS_RCVCAT
5) DBMS_RCVMAN
6) DBMS_Shared_pool
7) dbms_standard
8) dbms_utility
9) dbms_backup_resotre
10) standard
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hi,
Loading large objects is the primary source of fragmentations. Users' response time is affected because of the large number of small objects that need to be aged out from the shared pool to make room. To prevent these situations Keep these large or frequently required objects in the shared pool to make sure that they are never aged out of the shared pool.
thanking u

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Hi,
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when i try the same with a nwdi managed web dynpro component i run into problems regarding references to used dcs. for instance, i need to reference used dc SAP_JTECHS/tc/epbc/pcm/adminapi/java because the build needs tcepbcpcmadminapijava.jar which is inside the mentioned dc. but access permissions of this dc don't allow the dependency. when i try to "add used dc ..." in nwds i get the error message: illegal dependency: access list does not allow use of ...
has someone any solution for this problem? are there other ways of accessing pcd-objects from java web dynpro (nwdi managed!)?
thanks
heiko
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Hi Kust,
To access the PCD objects the code you used looks ok for me but your main issues is related to the dc access permissions. This thread discussed about the similar issue. Please review this below thread.
/message/979328#979328 [original link is broken]
Regards
Krishna Reddy

LARGE OBJECT IN JAVA

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