ER: Java class diagrams do show inheritance from no-sourcecode classes

Hi!
We just noticed that when we extend some classes for which the source code is not available, such inheritance is not visible on diagrams.
I would like to propose ER to show these inheritances (as the no-source classes signatures are enough to display the class on diagram). It is very inconvenient to have diagrams without possibility to depict the inheritance from many Oracle classes, as this inheritance is more and more important for building ADF applications.
Thanks for consideration.
PaKo

Pako,
I filed the ER
Frank

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Inheriting from an abstract class

Hi all,
I'm using a certain graphics package and I need to modify a functionality of one of its classes called, say, PlainAxis. For this purpose I define a class MyAxis that derives from the class Axis which is the base class for PlainAxis as well. The Axis class is abstract; it has two abstract methods - draw() and copy(). I provide these two methods in MyAxis, so, it can be instantiated. Still I get the following error message during the compilation:
MyAxis should be declared abstract; it does not define draw() in Axis
Here is the command I'm executing (sgt.jar contains classes of the graphics package I'm using):
javac -g -classpath .:./sgt.jar *.java -d .
What am I doing wrong? Why does this error occure for the draw() method only?
Thank you for the help!

You probably didn't define draw() with the exactsame
method signatureBelieve me I did :) This was the first thing I
checked when I saw this error for the first time...
Any other suggestions? :)The possibilities that I can think of are (most of these have already been suggested):
1. you didn't define draw with the correct signature
2. you're not extending the class you think you're extending
3. you're not compiling the class you think you're compiling
4. there's a bug in your compiler
I'd say 3 is extremely unlikely. So without seeing your code, we can only guess, but I would guess #1.

Inheritance from interface ans class

Hi All
Say I have interface A and class B.
Now I creating class C extands B implements A
who is C's super class? the class or the interface?
Can I write somthing like this?
A name = new C() or B name = new C()?
Thank u in advance
Eyal

Hi All
Say I have interface A and class B.
Now I creating class C extands B implements A
who is C's super class? the class or the interface?The class, because you said superclass.
Can I write somthing like this?
A name = new C() or B name = new C()?
Thank u in advance
EyalDo you have access to a compiler? You could try it and see faster than you
would get an answer from the forum.

VS2013.4 Class Diagram inheriting from a base type (how do I)

Hi Folks,
I am creating a VS2013.4 class diagram and one of my classes inherits from a base class System.Configuration.ProviderBase.
In VS2010 there is a way to do this and the class new class would show (Abstract Class -> ProviderBase) in its description. Is there a way to
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If the User-Agent contains "Fennec/" then it is Firefox for mobile. If it contains "Android" then it is running on an Android device.
We have an open request to add more device info to the User-Agent header. For details, see:
https://bugzilla.mozilla.org/show_bug.cgi?id=625238
We'll consider this request, but we must balance it against user privacy, and attacks like browser fingerprinting. For now, in cases where you don't detect a known device from the User-Agent header, you can ask the user instead (for example, have them choose from a list of devices). This will also benefit Android users who have changed their browsers' User-Agent headers for various reasons.

I can not drag java class onto uml class diagram - why??

Hi
1. I created a new java web project
2. I created a new uml project.
3. I created new classes in the java web project.
4. I created a new "class diagram" in the uml project.
PROBLEM:
1. When I drag one of the classes onto the class diagram screen, nothing happens. That is, when I perform the "drop"...nothing happens.
(NOTE: when I drag a "package" to the class diagram, a box representing the java package appears... I just cant get this to work for a class(s) )
QUESTION:
Should I be able to drag a class (or classes) from my web project src folder onto the UML project's class diagram and have UML representations of the classes appear?

Hi Shay
Unfortunately, I cannot view the suggested youtube stuff at work. (I'll try to view it when I get home)
But, in the meantime, I did kind of get things working...
After creating the java project and uml project (and initial class diagram), I had to
1. drag the java packages (containing the classes I wanted diagrammed) onto the root node of the UML project (i.e., located on the left side "navigation" bar). Afterward, the package appeared under the UML project....Then,
2. One by one I had to drag the individual java classes from the java project onto the root node of the UML project (i.e,. the classes then appeared under their respective packages under the UML project) . Then,
3. Then, finally, I could drag the java classes (listed under their respective packages under the UML project) onto the class diagram panel, where the rendered properly.
I dont know if this is supposed to be the way to "reverse engineer" java classes to be part of a UML class diagram... But, it was the only way I found that worked... thus far, anyway.
Thanks again for reading my post and answering so promptly.... That was much appreciated!
s

Drop6: Java/Class Diagrams - associations + thumbnail isssue

Hi JDev team
I'm having a play with the Java/Class Diagrams in 11g Drop6 and importing existing class structures to display.
Under an ADF BC project I've created both a Java Diagram and a Class Diagram, and added the "oracle.jbo.server.AppModuleImpl" class. I then right click on the imported class in the diagram, then Show -> Related Items, and it imports a large array of classes as expected.
2 problems I see:
1) Minor issue: If you layout the components using the Diagram Hierarchical Top to Bottom layout option, the thumbnail view doesn't zoom out far enough to allow you to move around the whole diagram.
2) In the diagram, the imported elements only seem to show Generalizations (extend) and Dependencies (interfaces), yet not associations (ie. one class includes a by ref-variable handle to another class). I'm sorely missing this 3rd feature. Am I missing something to enable this? It used to do this in 10.1.3, but with the old 10.1.3 diagrammer tool. Has this feature been dropped?
Cheers,
CM.

Boing.

UML modeling for class diagrams, could not generate code for modified diagr

Hi,
I'm using Java studio Enterprise for creating class diagrams and generating code from the UML using round trip engineering. I'm able to create class diagrams and generate code from the diagram. I tried modifying java code for classes and saved it. Now if I try and modify the diagram its not updating the java code associated with it.
Please suggest the workaround or so.
Thanks
Sunita

Maybe the linkage between the source and model class element is broken. Try to expand the class element from the project tree to see if a source file artifact node (under the class that displays the pathname as the name of the node). If not, that's why. Then, the workaround is to manually add the pathname to the java source file. Here are the steps:
- expand the class in question
- select the source file artifact node
- from the properties window on the right side of the ide, enter the exact pathname to the java source file and press the Enter
It should work now.

Prob with inheriting a user defined class

Hi,
Hi,
I have a servlet class(FortuneBrat) which is inheriing
from CoreServlet:
CoreServlet class:
[C]
import javax.servlet.*;
import java.io.*;
abstract public class CoreServlet extends GenericServlet{
private static final int UNINITIALIZED = 0;
private static final int INITIALIZED = 1;
private static final int DESTROYED = 2;
private int m_state = UNINITIALIZED;
public final void init(ServletConfig cfg) throws ServletException {
if(m_state==UNINITIALIZED) {
super.init(cfg);
init();
m_state=INITIALIZED;
public void init () throws ServletException { }
public final void destroy ( ) {
if(m_state != DESTROYED) {
m_state= DESTROYED;
try {
cleanup();
catch(ServletException se) {
CharArrayWriter cw = new CharArrayWriter ();
PrintWriter pw = new PrintWriter (cw);
se.printStackTrace(pw);
log (cw.toString());
protected void cleanup () throws ServletException{}
public final boolean isUnitialized() {
return (m_state== UNINITIALIZED);
public final boolean isInitialzaed ( ){
return (m_state== INITIALIZED);
public final boolean isDestroyed ( ) {
return (m_state == DESTROYED);
& the FortuneBrat class which is inheriting CoreServlet
import javax.servlet.*;
import java.io.*;
import java.util.*;
public class FortuneBrat extends CoreServlet{
private Vector fortunes;
private int current;
protected void init ( ) throws ServletException {
fortunes = new Vector ( );
fortunes.addElement("Learn Java Now");
current = 0;
public void Service (ServletRequest req, ServletResponse res) throws ServletException, IOException{
PrintWriter pw= res.getWriter();
pw.println(getFortune());
pw.close();
public String getFortune() {
if (current >= fortunes.size ( )) {
current=0;
return (String) fortunes.elementAt(current++);
public void addFortune(String fortune) {
fortunes.addElement(fortune);
}The error which I am getting is that its not recognizing CoreServlet class.
I hope I would get a quick response in this regard.
Zulfi.

Here's a quick response:
Quit cross-posting this all over the place
http://forum.java.sun.com/thread.jsp?thread=425373&forum=7&message=1891714

Navigation amongst class diagrams

Does JDeveloper support the navigation amongst class diagrams? For example, I have many class diagrams and I am looking for a class diagram that contains a class. Most of the UML designers provide features to get a list of diagrams where a specific class appears on and you can select which diagram you want to work on. It seems that this feature is missing from JDeveloper. Am I right?

I'm sorry to say that, but currently it is not possible. The UML support has been dropped by NetBeans a few years ago (after 6.7 release)Al. Since than it has been taken over by community (led by Javier Ortiz <[email protected]>) about 2-3 years back and it is been developed as community plug-in. This group is very focused on Java support. Meanwhile Javier asked me about C++ APIs couple of years ago. You may try to sync up with him to figure out there they are with C++ support.
In Studio you may try the Call Graph feature which is not a substitution to UML by any means, however it may serve you well depending on your needs.
Also please note that Visual-Paradigm provides a commercial UML plug-in for NetBeans: http://www.visual-paradigm.com/support/documents/vpumluserguide/2381/2384/66569_overviewandi.html
while the IDE integration is mentioned as a feature of free community edition as well. I know for sure that VP supports C++ UML, but I do not know if that support is enabled for NetBeans and Solaris Studio.
BR,
Leonid.

Creating java code from a class diagram in JDeveloper

I have created a class diagram in JDeveloper 11.1.1.3.0. When I generated java code from the class diagram by right clicking on the class diagram->transform->same diagram->UML to Java, a .java file is generated with attributes and getters/setters, and also a .uml_cla file is generated. What is this .uml_cla file exactly and what is it used for? Also I have a package.uml_pck file that was created 3 times. I have a package of com.xxx.xxxx, and it put this package.uml_pck file in "com", in "xxx", and in "xxxx". Do I need to retain all 3 of these files in my project?
One more question related to this. When I change something in the java representation of the class diagram (i.e. a datatype), it updates the .java file that was generated from the class diagram, and it also works the other way...change the .java file and the java representation of the class diagram changes. However, the class diagram that the code was generated from does not change, nor does the mysterious .uml_cla file I asked about in the above paragraph.

This did work for me, with an exception. I have put the .java files generated from the class diagram in a different package from the .class_diagram file, the package.uml_pck file, and the .uml_cla file to keep the actual source code separate. When I modified the .java file and transformed the class diagram from java to UML, it created the package.uml_pck file and the .uml_cla files again in the same package as the .java file, and they show the update. The package.uml_pck file, and the .uml_cla file that were originally created and are in the separate package from the .java files were untouched, thus the class diagram displayed does not reflect the change either. Does this mean I should not, or cannot, separate these files, and that they all must be left in the same package? (the purpose of separating it in the first place was for ease of deployment since we don't want to deploy any of the class diagram files) Thanks!

Enhancement request: Java Class Diagram show option

Hi JDev team
Can you log the following enhancement request for the Java Class Diagram editor please? When right clicking an existing class in the diagram, then the Show option, it would be useful to have a Dependent Elements option that will add any subclasses to the selected parent class.
For example, say I had oracle.jbo.server.RowImpl selected, if I selected this new option it would automatically add EntityImpl and ViewRowImpl, saving me having to look at the JDoc for RowImpl to determine the subclasses then manually add the classes to the diagram.
Thanks & regards,
CM.

Chris,
This is an interesting feature. The ER tracking number for this potential feature is 6279169.
--Ric

Enhancement request: Java Class Diagram new facilities

Hi JDev team
Can you log the following enhancement request for the Java Class Diagram editor please? Firstly it would be useful when selecting a class in the diagram that the Hierarchy window was synchronized and updated the class stack to show the selected item.
Secondly it would be nice to be able to drag and drop items from the Hierarchy window into the Java Class Diagram to be included in the diagram.
Thanks & regards,
CM.

Chris,
I submitted an ER for your request. The tracking number is 6279159.
--RiC

Java Source Code to UML Class Diagram

Can anyone tell me exactly which kinds of relationships may be identified for a UML CLass diagram, directly from 'static' source code..
Note that I am developing my own case tool which will convert from java to uml..
At the moment, I have only managed to get Inheritance and Association relationships..
Where Association is identified by looking at the types of all variables belonging to a class (excluding method variables etc) and if the type of the variable is non-primitive, than I have deduced it is an association relationship with that class.
Would this be the right approach?
Secondly I have noticed in JBuilder, it models dependency relationships by getting all the Imports at the top of the java source file, is this right?? also I have read that a dependency can be modelled by the variable types in operation arguments (paremeterS ?)..
I would also appreciate if someone could clarify the difference betweeen Composition and Aggregation for me and explain if it is possible to identify the two relationships directly from java source code..
Last but not least, what about multiplicity ? am I right in thinking that an instance variable is 0-1, an array declaration is seen as 0-n (fixed number) and a Vector/ data collection.. is seen as 0 - * (any number)..
Thanks for any help,
Regards
Tony.

although this post is way old it could do with a decent answer.
some guidance can be taken from JSR26: UML Mapping for EJB
find it a www.jcp.org
also this research paper on consistency of reverse engineering between uml tools
http://citeseer.nj.nec.com/545406.html
Where Association is identified by looking at the types of all variables belonging >to a class (excluding method variables etc) and if the type of the variable is >non-primitive, than I have deduced it is an association relationship with that >class.
Would this be the right approach?Yes. You could also say that if it is a java.* type then it would also be an attribute.
Secondly I have noticed in JBuilder, it models dependency relationships by getting >all the Imports at the top of the java source file, is this right?? also I have >read that a dependency can be modelled by the variable types in operation >arguments (paremeterS ?)..JBuilder would be consistent with JSR26, and that's how i intend to implement in ArgoUml.
I would also appreciate if someone could clarify the difference betweeen >Composition and Aggregation for me and explain if it is possible to identify the >two relationships directly from java source code..Composition is a stronger form of ownership. the composed class is owned only by 1 class. Its lifetime is strongly linked to its owner - ie. it is not created before its owner and it is destroyed before its owner is.
eg. leg of a table.
Agregation is weak ownership. the owned class may be owned by several classes.
eg. a company is owned by many shareholders.
Last but not least, what about multiplicity ? am I right in thinking that an >instance variable is 0-1, an array declaration is seen as 0-n (fixed number) and a >Vector/ data collection.. is seen as 0 - * (any number)..sound right.
Alex

Can't generate code from class diagram

I have installed Studio Enterprise 8. I tried to create a class, but when I right-clicked on a class, there was no "Generate Code" on the contextual menu.
I've tried the Help guide as pasted below. Would appreciate anybody's help. Thanks.
To generate code:
In the Projects window or in a diagram, right-click the element or elements for which you want to generate code.
In the Projects window, this code generation function is supported for entire UML projects and for individual diagram elements.
On the contextual menu, choose Generate Code. The IDE generates source code for all of the target items and displays the code in the Source Editor.

Thanks, but I still have problem.
File / New Project
UML / Java Platform Model
Name: UMLTest Location: D:\UML Unchecked Generate Code
The UMLTest Project appears in the Project Window
--- So far so good
File / New Project
General / Java Application
--- There is no General category
Under Category: Samples, Standard, UML, Web
Under Samples, there is general, but project = Anagram Game.
I still can't create a Java application from scratch.
Using Web and Standard, I must provide ANT

JavaDoc HTML link of classes in Java class diagram not correct

Hi,
I created a Java class diagram in a certain package (e.g. com.mycompany.p1) and placed some classes on this diagram from the same package and from other packages. Then I created JavaDocs. When I click on the classes in the created JavaDoc diagram, only the links of the classes in the same package as the diagram (com.mycompany.p1) wor correctly. When I click on a class outside this package I get an error message that the file is not found. It looks for the class documentation in the package of the diagram and this is obviousely wrong!
Is there a property I missed to set or is it a bug?
Thanks for help
Thomas

Hi Thomas,
I don't use the diagrammers much, so I cannot comment on this directly; however, based on your description, it does sound like a defect. Do you have access to Oracle Support to file an SR?
John

ER: Java class diagrams do show inheritance from no-sourcecode classes

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