SRDemo tutorial- Reverse engineer TopLink Java Objects from existing DB tab

Hi,
In the tutorial, what does reverse engineer objects from existing tables means?
Thanks!

It means that JDeveloper will create Java classes that interact with the database, based on existing tables in the database.

Similar Messages

2 TopLink Java Object from Table to be used in single selectOneChoice

Hello everyone, can I ask for help on how to solve my problem....
Here's my scenario, I have 2 tables namely tblCollege and tblCourse, they are related through tblCourse.CollegeCode = tblCollege.Code.
I use the jdeveloper wizard using TopLink -> Java Object from Table to add these table to my project. I created an EJB Data Control so that I can use them to my Userinterface using ADF Faces.
What I really want to do is that I need to have selectOneChoice component displaying:
tblCollege.Name + tblCourse.Name, and it should have a value of tblCollege.Code + tblCourse.Code,
so for example in my
tblCollege:
Code---------Name
1---------------Science
2---------------Music
tblCourse
Code-------Name-----------CollegeCode
1-------------Biology----------1
2-------------Computer-------1
3-------------Guitar------------2
what I want in my selectOneChoice is like this:
value----------display
1-1--------------Science-Biology
1-2--------------Science-Computer
2-3--------------Music-Guitar
I'm a little stuck on how I'm going to that. Thanks.

Bawasi,
I see a couple of angles of attack, but this really depends on the technologies involved. If you are using ADF Bindings in combination with ADF Faces then you need to shape the data at the entity level. If ADF Bindings are no the in equation, you can take a less aggressive approach and shape the data in a managed bean. What is not clear to me is the end-to-end use-case. I see the read-only (i.e. how to get data to the drop box), but I am
not certain what attribute on an entity you are attempting to set. Are you trying to set the course for the current user or for a master schedule? Finally, notice that the final shape of your data set shows a unique combinations, you could increase the performance of your use-case and ease of development simply by denormalizing your schema.
--RiC

Which is better ? Toplink Java objects or Toplink Entities ?

Hi
We are planing to use Toplink JPA that comes with JDeveloper 11g preview release
I have a question here!
I would like to get clarified which is better to use :
1. Toplink Java Objects from Tables ,
2.Toplink Entities from Tables
Could you suggest the best approach, and pros and cons of both the approaches?
Thanking you ,
Samba

Samba,
Ultimately both are using the same TopLink runtime. In the case of Entities you are using JPA and Java Objects you are using TopLink native API and metadata.
Going forward I would recommend JPA with TopLink extensions as required.
Doug

Reverse Engineer / Import Selected Objects

Hello All,
I am new to ODI tool and trying to understand, how to reverse engineer / import selected objects? I am unable to do this.
For instance, I have 10 tables in database, I want to import/reverse engineer 3 of them, how do I this in one go? I am able to do this, one by one.
Your Help is appreciated.
Thanks,
Andy.

Hi
Create a model.--> click on selective reverse engineering---> check New Datastore and object to reverse engineer. then you can select 3 tables out of 10 tables.
what do you mean by import here ?
Are you trying to import 3 tables from ODI ?
Thanks

How to reference multiple instances of the same Java object from PL/SQL?

Dear all,
I'm experimenting with calling Java from PL/SQL.
My simple attempts work, which is calling public static [java] methods through PL/SQL wrappers from SQL (and PL/SQL). (See my example code below).
However it is the limitation of the public static methods that puzzels me.
I would like to do the following:
- from PL/SQL (in essence it needs to become a forms app) create one or more objects in the java realm
- from PL/SQL alter properties of a java object
- from PL/SQL call methods on a java object
However I fail to see how I can create multiple instances of an object and reference one particular object in the java realm through public static methods.
My current solution is the singleton pattern: of said java object I have only 1 copy, so I do not need to know a reference to it.
I can just assume that there will only ever be 1 of said object.
But I should be able to make more then 1 instance of an object.
To make it more specific:
- suppose I have the object car in the java realm
- from PL/SQL I want to create a car in the java realm
- from PL/SQL I need to give it license plates
- I need to start the engine of a scpecific car
However if I want more then 1 car then I need to be able to refrence them. How is this done?
Somehow I need to be able to execute the following in PL/SQL:
DECLARE
vMyCar_Porsche CAR;
vMyCar_Fiat CAR;
BEGIN
vMyCar_Porsche = new CAR();
vMyCar_Fiat = new CAR();
vMyCar_Porsche.setLicensePlates('FAST');
vMyCar_Porsche.startEngine();
vMyCar_Fiat.killEngine();
END;
Thanks in advance.
Best Regards,
Ruben
My current example code is the following:
JAVA:
===
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED CODAROUL."RMG/BO/RMG_OBJECT" as package RMG.BO;
public class RMG_OBJECT {
private static RMG_OBJECT instance = new RMGOBJECT();
private String rmgObjectNaam;
private RMG_OBJECT(){
this.rmgObjectNaam = "NonDetermined";
public static String GET_RMGOBJECT_NAAM () {
String toestand = null;
if (_instance == null) {toestand = "DOES NOT EXIST";} else { toestand = "EXISTS";};
System.out.println("instance : " + toestand);
System.out.println("object name is : " + _instance.rmgObjectNaam);
return _instance.rmgObjectNaam;
public static Integer SET_RMGOBJECT_NAAM (String IN)
try
_instance.rmgObjectNaam = IN;
return 1;
catch (Exception e)//catch
System.out.println("Other Exception: " + e.toString());
e.printStackTrace();
return 5;
} //catch
PL/SQL Wrapper:
==========
CREATE OR REPLACE FUNCTION CODAROUL.SET_RMGOBJECT_NAAM(NAAM IN VARCHAR2) return NUMBER AS
LANGUAGE JAVA NAME 'RMG.BO.RMG_OBJECT.SET_RMGOBJECT_NAAM (java.lang.String) return java.lang.Integer';
Calling from SQL:
==========
CALL dbms_java.set_output(2000);
select CODAROUL.GET_RMGOBJECT_NAAM() from dual;
Edited by: RubenS_BE on Apr 6, 2012 5:35 AM
Edited by: 925945 on Apr 6, 2012 5:41 AM

You can do this by manually creating a new iterator binding in your binding tab.
So instead of dragging the VO directly to the page, go to the binding tab, add a new executable iterator binding, and point to that one from your ELs in the page itself.

Dropping java object from Oracle 8i

We areaable to load java methods and publish them to SQL in Oracle 8i using Jdev Deploy wizard, but we can not drop them thru
Open View As->Database Browser of the connection object, they drop menu is greyed out/disable. What kind privilege we need to drop java object from Oracle 8i? Or there is something wrong with the database setup.
Thank you very much

There are three options:
Normal
SysDBA
SysOper
I have tried the three of them, none of them works, is there third option SYS?
Thank you very much.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Amit:
Log in as SYS.<HR></BLOCKQUOTE>
null

How can I drop the java objects from a schema

hi..good afternoon all...
How can I drop the java objects from a database schema???
suppose the credentials are scott/tiger@db1
Another thing is that...I have to do this from cmd(command prompt) as there is no plsql developer or sqldeveloper installed in the machine.
plss help...thanks in advance...

hi...i have already tried all the options..but it is showing the error..
ora:01435 - user does not exist
but when i have given the command...
select object type, object_name, status from user_objects where object_type like'%JAVA%';
then it is showing that the java_object is present....
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
SQL>
SQL>
SQL> set linesize 200
SQL>
SQL>
SQL>
SQL> select object_type, object_name, status from user_objects where object_type
like '%JAVA%';
OBJECT_TYPE OBJECT_NAME
STATUS
JAVA CLASS javaclass1
VALID
JAVA SOURCE javaclass1
VALID
SQL> drop java source javaclass1.java;
drop java source javaclass1.java
ERROR at line 1:
ORA-01435: user does not exist
SQL>

Accessing java objects from within javascript

Hello,
Anyone with an idea of a useful toolkit for accessing java objects from within javascript will be much appreciated.
Thanks in advance,
Antana.

What do you mean by accessing Java objects? Do you mean interacting with an applet via JavaScript? Something else?

How can i return an object isn't java object from webservice????

Hi !
I have a problem in my Project. When i call method return a java object from webservice , it 's too easy. But when i create my own object (ex:ClientRequest.class) , it doesn't work exactly T_T . When i return that object (on client, doesn't have ClientRequest.class) , i cann't access its static variables.
How can i do it ??
Please help me !
Thanks a lot !!!!!
class ClientRequest {
public static int i;
public static String s;
public ClientRequest() {
}

You can use REFCURSOR type for this. In java SQL TYPES this is available too. In your PLSQL use REFCURSOR for that array and then take the same from java code. Look in the servelet programming book for this SQLTYPE and see PLSQL for handling refcursors. We have done this way and it works.

Access Java object from Javascript

Hi
I'm trying to invoke a Java object from Javascript (scriptengine and all that).
I want to add scripting features to a GeneXus Java generated app... and I have very basic skills on java too. Sorry for that ;o).
This is the java code to pass "params" to the scriptengine:
engine.put("remoteHandle",remoteHandle);
engine.put("context", context); The remoteHandle (int) and context (com.genexus.ModelContext) pass trough all the gx-java generated programs.
This javascript works fine:
importClass(Packages.uftestjs);
new uftestjs(remoteHandle).execute( ) ;The remoteHandle conversion is ok (javascript-number to int). The context is optional.
But if I want to pass context:
importClass(Packages.uftestjs);
new uftestjs(remoteHandle, context).execute( ) ;Fails with this:
"javax.script.ScriptException: sun.org.mozilla.javascript.internal.EvaluatorException: Java constructor for 'uftestjs' with arguments 'number,javax.script.SimpleScriptContext' not found."
Obviously, no conversion is possible with context (javax.script.SimpleScriptContext to com.genexus.ModelContext).
There is some way to reference de original context, by the object Id??? or something like that???
Thanks in advance for any replies!!!
Greetings from Chile. (I hope you can understand my english!)

Hi
Well, since this topic is about java programming I think the place is right here.
(I use some tricks to embed java statements in genexus objects...)
I will try to get some help at Artech (GX) on how to build something... to get the conversion needed.
But they are not focussed on support this kind of questions.
Anyway, I want to know: do I can to reference an object by the objId?
I want to code something like this:
com.genexus.ModelContext context =
(com.genexus.ModelContex)getTheObjectFromTheJVM(theObjectId);(powered by google translator, ha!)

32-bit JVM receiving Java objects from 64-bit JVM

Hi folks,
Question is: will there be problems for 32-bit JVM receiving Java objects from 64-bit JVM? and vice versa.
Our application client is running on 32-bit JVM, our server is running on 64-bit JVM. Client will send Java objects to server, and vice versa.
My past experience suggested when sending Java objects between client and server, both client and server needs to be compiled under the same JVM version. Any advice?
Christy

My past experience suggested when sending Java
objects between client and server, both client and
server needs to be compiled under the same JVM
version. Any advice?This is only a case if you omit explicit serialVersionUID. My advice is to ALWAYS specify it for classes you want to serialize over the wire or put into persistent storage. It is way too tricky to rely on default one to fail half a year later when some new programmer adds one new public method to a class.
Unless you need to deserialize already existing resources, there is no need to put any magic number in serialVersionUID - just put 1 for every class you create and possibly increase it by 1 every time you want to make incompatible version (which is not happening so often, as in real world you often try to stay as compatible as possible)

How can I call a java object from Web dynpro ABAP application?

I made Web dynpro ABAP application and posted it to SAP EP.
For certain business purpose, we need to call external 3rd party java object using 3rd party's java api in Web dynpro application.
Is there anybody who experienced this kind of java interface issue?
I know Web dynpro Java environment can fully support this kind of requirement. but regarding Web dynpro ABAP, I couldn't find any clue for this.
Any comment or suggestion would be greatly appreciated.
Thanks,
Raymond, ABAP Consultant

if you have jco configured, then you can make calls to java api from ABAP .
check out this weblog.
/people/gregor.wolf3/blog/2004/08/26/setup-and-test-sap-java-connector-outbound-connection
Raja

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.

Create java objects from xml

I want to create a tree structure for java object. These java objects are populated after the parsing the xml. But what could be the logic for adding child to parent when there are
many sub nodes? I wanted to use one recursive function which iterate through all the elements of the xml file. But I have not got the idea how to add one child object to parent object.
following are my classes. Any help on this highly appreciated.
public class TreeObject {
          private String name;
          private TreeParent parent;
          public TreeObject(String name) {
               this.name = name;
          public String getName() {
               return name;
          public void setParent(TreeParent parent) {
               this.parent = parent;
          public TreeParent getParent() {
               return parent;
          public String toString() {
               return getName();
import java.util.ArrayList;
public class TreeParent extends TreeObject {
     private TreeObject treeObject ;
          private ArrayList children;
          public TreeParent(String name) {
               super(name);
               children = new ArrayList();
          public void addChild(TreeObject child) {
               children.add(child);
               child.setParent(this);
               treeObject = child ;
          public void removeChild(TreeObject child) {
               children.remove(child);
               child.setParent(null);
          public TreeObject [] getChildren() {
               return (TreeObject [])children.toArray(new TreeObject[children.size()]);
          public boolean hasChildren() {
               return children.size()>0;
          public TreeObject getChild(){
               return treeObject;
private TreeParent getChilderen(Element rootNode){
     List list = rootNode.getChildren();
     String rootNodeName = rootNode.getName();
     TreeParent root = new TreeParent(rootNodeName);
     for (int i=0; i< list.size(); i++)
Element node = (Element) list.get(i);
if(node.getChildren().size() > 0){
     // TreeParent treeParent = new TreeParent(node.getText());
     TreeParent treesub = new TreeParent(node.getText());
     treesub.addChild(treesub);
     //TreeParent p = treeParent.getParent();
     // rootParent.addChild(treeParent);
}else{
     TreeObject object = new TreeObject(node.getText());
     root.addChild(object);
getChilderen(node);
     return root ;
public TreeParent buildTree(String filePath) {
SAXBuilder builder = new SAXBuilder();
File xmlFile = new File(filePath);
try{
Document document = (Document) builder.build(xmlFile);
Element rootNode = document.getRootElement();
// List list = rootNode.getChildren("staff");
TreeParent rootParent = getChilderen(rootNode);
return rootParent ;
}catch(IOException io){
System.out.println(io.getMessage());
}catch(JDOMException jdomex){
System.out.println(jdomex.getMessage());
return null;
Edited by: 870611 on Jul 6, 2011 6:27 AM

Hi
I recommend you use the API JAXB. Is much simpler.
here a link: http://www.oracle.com/technetwork/articles/javase/index-140168.html
here a example: http://download.oracle.com/javaee/5/tutorial/doc/bnbay.html#bnbbc

Newbie question on how to return java objects from java stored procedures

Hi,
As you may guess, i'm new to this.
I have a stored procedure that does some calculations and creates a list of java objects as the result of the query.
How would I return the list from the database to the client application?
Would I have to create an Oracle type that maps to the java object?
Please help.
Jag

Hi Jag,
Your question is very vague (to me). Perhaps you could post what you have done so far? Have you tried looking through the Sample Code page of the Technet Web site, or tried searching the Ask tom Web site, or MetaLink?
Good Luck,
Avi.

SRDemo tutorial- Reverse engineer TopLink Java Objects from existing DB tab

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