Strange problem with Inheritance

Hi,
I have a Strange problem with Inheritance which I think should work, but doesn't.
I have 3 classes in 3 different packages.
Class A in package 1 is abstract
Class B extend class A is also Abstract and is in package 2
Class C extend Class B and is in package 3
When i do the following
C c = new C();
A a = (A)c;
I get a class cast exception
Any ideas?
Jag

That should work fine. Can you check the exact classes created (using: System.out.println(c.getClass().toString()). You may have accidentally created an instance of a class with the same name but from a different package.

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Strange Problem with a Vector wraped inside a Hashtable

Hi all ,
I'm having a strange problem with a Vector wraped within a Hashtable inherited Class.
My goal is to keep the order of the elements of the Hashtable so what I did was to extend Hashtable and wrap a Vector Inside of it.
Here is what it looks like :
package somepackage.util;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
public class OrderedHashTable extends Hashtable {
 private Vector index;
 /** Creates a new instance of OrderedHashTable */
 public OrderedHashTable() {
 this.index = new Vector();
//adds a key pair value to the HashTable and adds the key at the end of the index Vector
 public synchronized Object put(Object key,Object value){
 index.addElement(key);
 Object obj = super.put(key,value);
 System.out.println("inside OrderedHashTable Put method index size = " + index.size());
 return obj;
public synchronized Object remove(Object key){
 int indx = index.indexOf(key);
 index.removeElementAt(indx);
 Object obj = super.remove(key);
 return obj;
public synchronized Enumeration getOrderedEnumeration(){
 return index.elements();
public synchronized Object getByIndex(int indexValue){
 Object obj1 = index.elementAt(indexValue);
 Object obj2 = super.get(obj1);
 return obj2;
 public synchronized int indexOf(Object key){
 return index.indexOf(key);
 public synchronized int getIndexSize() {
 return index.size();
 }Everything seemed to work fine util I tried to add objects using a "for" loop such as this one :
private synchronized void testOrderedHashTable(){
 OrderedHashTable test = new OrderedHashTable();
 for (int i = 1 ; i<15; i++){
 System.out.println("adding Object No " + i);
 String s = new String("string number = "+i);
 test.put(new Integer(i),s);
 System.out.println("-----------------------------------");
 //try to list the objects
 Enumeration e = test.getOrderedEnumeration();
 while (e.hasMoreElements()){
 Integer intObj = (Integer) e.nextElement();
 System.out.println("nextObject Number = "+ intObj);
 }Here is the console output :
Generic/JSR179: adding Object No 1
Generic/JSR179: inside OrderedHashTable Put method index size = 1
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 2
Generic/JSR179: inside OrderedHashTable Put method index size = 2
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 3
Generic/JSR179: inside OrderedHashTable Put method index size = 3
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 4
Generic/JSR179: inside OrderedHashTable Put method index size = 4
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 5
Generic/JSR179: inside OrderedHashTable Put method index size = 5
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 6
Generic/JSR179: inside OrderedHashTable Put method index size = 6
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 7
Generic/JSR179: inside OrderedHashTable Put method index size = 7
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 8
Generic/JSR179: inside OrderedHashTable Put method index size = 8
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 9
Generic/JSR179: inside OrderedHashTable Put method index size = 10
Generic/JSR179: inside OrderedHashTable Put method index size = 10
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 10
Generic/JSR179: inside OrderedHashTable Put method index size = 11
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 11
Generic/JSR179: inside OrderedHashTable Put method index size = 12
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 12
Generic/JSR179: inside OrderedHashTable Put method index size = 13
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 13
Generic/JSR179: inside OrderedHashTable Put method index size = 14
Generic/JSR179: -----------------------------------
Generic/JSR179: adding Object No 14
Generic/JSR179: inside OrderedHashTable Put method index size = 15
Generic/JSR179: -----------------------------------
Generic/JSR179: nextObject Number = 1
Generic/JSR179: nextObject Number = 2
Generic/JSR179: nextObject Number = 3
Generic/JSR179: nextObject Number = 4
Generic/JSR179: nextObject Number = 5
Generic/JSR179: nextObject Number = 6
Generic/JSR179: nextObject Number = 7
Generic/JSR179: nextObject Number = 8
Generic/JSR179: nextObject Number = 9
Generic/JSR179: nextObject Number = 9
Generic/JSR179: nextObject Number = 10
Generic/JSR179: nextObject Number = 11
Generic/JSR179: nextObject Number = 12
Generic/JSR179: nextObject Number = 13
Generic/JSR179: nextObject Number = 14
You can notice that the output seems correct until the insertion of object 9.
At this point the vector size should be 9 and the output says it is 10 elements long ...
In the final check you can notice the 9 was inserted twice ...
I think the problem has something to do with the automatic resizing of the vector but I'm not really sure. Mybe the resizing is done in a separate thread and the new insertion occurs before the vector is resized ... this is my best guess ...
I also tested this in a pure J2SE evironment and I don't have the same strange behavior
Can anybody tell me what I am doing wrong or how I could avoid this problem ?
Thanks a lot !
Cheers Alex

Am i doing anything wrong?Uhm, yes. Read the API doc for addElement() and for addAll()

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The classes in actionscript seem plausable:
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Hey guys, i'm having a major problem with inheritances.
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http://www.4shared.com/file/ZleBitzP/Assign7.html
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Basshunter36 wrote:
Hey guys, i'm having a major problem with inheritances.
What i'm trying to do with my program is to create objects in my demo class. Values are passed to several other objects that each do their own calculations of grades and results and then outputs the result in my toString. I followed step by step the instructions in my book on how to setup the inheritance and such. I can only output everything that was created in my superclass, any other thing that was created in an object that belongs to a subclass does not display in the output at all.
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Because there's so much code to be splitting on the forums, I zipped my whole project in a RAR. I'll link it here
http://www.4shared.com/file/ZleBitzP/Assign7.html
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Here is a screen shot of my "About This Mac.
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Thanks
Jeff

you can pile it on this: http://discussions.apple.com/thread.jspa?threadID=1246649&tstart=0
btw - no solution yet.

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I have a strange problem with Adobe Acrobat. It happens totally randomly, it leaves no signs in system logs.
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try this
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I would try in order:
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     [wdgen]      at com.sap.ide.eclipse.component.provider.actions.dcproject.BuildAction.buildDCsForDevConfig(BuildAction.java:307)
     [wdgen]      at com.sap.ide.eclipse.component.provider.actions.dcproject.BuildAction.access$200(BuildAction.java:58)
     [wdgen]      at com.sap.ide.eclipse.component.provider.actions.dcproject.BuildAction$1.run(BuildAction.java:212)
     [wdgen]      at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
     [wdgen] ERROR: Unknown exception during generation null (com.sap.webdynpro.generation.ant.GenerationAntTaskError)
     [wdgen] ERROR: Generation failed due to errors (6 seconds)
Ant runtime 9.234 seconds
Ant build finished with ERRORS
[Error]   Generation failed!
Error: Build stopped due to an error: [Error]   Generation failed!
[/code]
Strange is that if I try to rebuild and deploy locally, no errors occurs and I can normally deploy and run application manually!
Does anyone have experience with this problem?
Thanks in advance!
Regards,
Ivan

Hi Ivan
I have faced this problem earlier BUT ultimately I have to create the DC from scratch.
But you can check these things:
1.Have you copy/pasted Dictionary type from other location (check the path of the dictionary types ) --> If yes then deleted that and create again(do not use copy/paste)
2.This also happens if your "Used DC" has some problems in the JDI --> Remove the used DC and add it again.
3.Make sure the NWDI infastructure is perfect- this may be a cause.
4. Check Context mappings --> delete all mappings > save metadata > Create again.
5. Delete the model and recreate it again.
6.If you have done reimporting model make sure to restart J2EE instance.
Hope this solves the problem - if not please post
Regards
Ananda

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