Cast from Class A to Class A B should be allowed?

https://bugs.eclipse.org/bugs/show_bug.cgi?id=99107
public final class A {
void doit() {
 Class<A> clazz1 = (Class<A>) this.getClass();
 Class<A> clazz2 = (Class<A>) clazz1;
 clazz2.getName();
}Sun's javac (1.5.0_03) gives an error:
A.java:5: inconvertible types
found : java.lang.Class<A>
required: java.lang.Class<A>
 Class<A> clazz2 = (Class<A>) clazz1;
 ^------- Additional Comment #1 From Philippe Mulet 2005-06-09 06:11 [reply] -------
According to the spec, cast conversion is allowed since the types are not
probably distinct.
I thus believe this is a bug in javac.

You can get around this with a double cast.
Class<A> clazz2 = (Class<A>) (Class) clazz1
Ugly, but it compiles. :(Or simply:
Class<A> clazz2 = (Class) clazz1However, I suspect that the OP wasn't really looking
for a work around ;-) I have noted the problem and
will file a javac bug if it isn't a dupe.

Similar Messages

How can I casting from parent class to children class

Dear,
Could someone help me to casting from parent class to children class.
I have class like this
class parent{
String name;
String id;
public String getId() {
return id;
public void setId(String id) {
this.id = id;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
class children extends parent{
String address;
public String getAddress() {
return address;
public void setAddress(String address) {
this.address = address;
public children() {
public children(parent p) {
//Do init super class here
In the constructor
public children(parent p) {
//Do init super class here
I like to init super class by object p (this is instance of parent class). The way to do is using:
public children(parent p) {
super.setId(p.getId());
super.setName(p.getName());
But I don't like this, because, for example I have parent class with over 30 proberties, it take time to do like that.
There are any way to use super operation to init parent class, for example super = p;
Could you show me the way.
Thanks alot

If I understand your question correctly, you are in need of a copy constructor for you class Parent. A copy constructor behaves like this:
   Parent one = new Parent();
   one.setName("...");
   //... and all other properties of interest
   Parent two = new Parent(one);
   //Now two != one, but one.getName().equals(two.getName) for property name and all othersThe copy constructor is programmed in the Parent class, more later. Then for your child class you can use it as follows
   public class Children extends Parent {
       public Children(Parent p) {
          super(p);
   }There are at least 3 ways of programming a copy constructor:
1. Just bite the bullet: type the assignment for each field this.name = p.getName()
2. Use reflection to find all common setters/getters dynamically and assign using them
3. Use a code generator that uses 2 to give you the code for solution 1 for you to paste in.
If you find doing this a lot, there are frameworks that can do these mappings, like Dozer
(PS be carefull with Date fields, don't copy the reference but create a new and equals instance, the dirty way would be this.birthdate = new Date(p.getBirthdate.getTime()); )

Passing a parameter from one class to another class in the same package

Hi.
I am trying to pass a parameter from one class to another class with in a package.And i am Getting the variable as null every time.In the code there is two classes.
i. BugWatcherAction.java
ii.BugWatcherRefreshAction.Java.
We have implemented caching in the front-end level.But according to the business logic we need to clear the cache and again have to access the database after some actions are happened.There are another class file called BugwatcherPortletContent.java.
So, we are dealing with three java files.The database interaction is taken care by the portletContent.java file.Below I am giving the code for the perticular function in the bugwatcherPortletContent.java:
==============================================================
public Object loadContent() throws Exception {
Hashtable htStore = new Hashtable();
JetspeedRunData rundata = this.getInputData();
String pId = this.getPorletId();
PortalLogger.logDebug(" in the portlet content: "+pId);
pId1=pId;//done by sraha
htStore.put("PortletId", pId);
htStore.put("BW_HOME_URL",CommonUtil.getMessage("BW.Home.Url"));
htStore.put("BW_BUGVIEW_URL",CommonUtil.getMessage("BW.BugView.Url"));
HttpServletRequest request = rundata.getRequest();
PortalLogger.logDebug(
"BugWatcherPortletContent:: build normal context");
HttpSession session = null;
int bugProfileId = 0;
Hashtable bugProfiles = null;
Hashtable bugData = null;
boolean fetchProfiles = false;
try {
session = request.getSession(true);
// Attempting to get the profiles from the session.
//If the profiles are not present in the session, then they would have to be
// obtained from the database.
bugProfiles = (Hashtable) session.getAttribute("Profiles");
//Getting the selected bug profile id.
String bugProfileIdObj = request.getParameter("bugProfile" + pId);
// Getting the logged in user
String userId = request.getRemoteUser();
if (bugProfiles == null) {
fetchProfiles = true;
if (bugProfileIdObj == null) {
// setting the bugprofile id as -1 indicates "all profiles" is selected
bugProfileIdObj =(String) session.getAttribute("bugProfileId" + pId);
if (bugProfileIdObj == null) {
bugProfileId = -1;
else {
bugProfileId = Integer.parseInt(bugProfileIdObj);
else {
bugProfileId = Integer.parseInt(bugProfileIdObj);
session.setAttribute(
("bugProfileId" + pId),
Integer.toString(bugProfileId));
//fetching the bug list
bugData =BugWatcherAPI.getbugList(userId, bugProfileId, fetchProfiles);
PortalLogger.logDebug("BugWatcherPortletContent:: got bug data");
if (bugData != null) {
Hashtable htProfiles = (Hashtable) bugData.get("Profiles");
} else {
htStore.put("NoProfiles", "Y");
} catch (CodedPortalException e) {
htStore.put("Error", CommonUtil.getErrMessage(e.getMessage()));
PortalLogger.logException
("BugWatcherPortletContent:: CodedPortalException!!",e);
} catch (Exception e) {
PortalLogger.logException(
"BugWatcherPortletContent::Generic Exception!!",e);
htStore.put(     "Error",CommonUtil.getErrMessage(ErrorConstantsI.GET_BUGLIST_FAILED));
if (fetchProfiles) {
bugProfiles = (Hashtable) bugData.get("Profiles");
session.setAttribute("Profiles", bugProfiles);
// putting the stuff in the context
htStore.put("Profiles", bugProfiles);
htStore.put("SelectedProfile", new Integer(bugProfileId));
htStore.put("bugs", (ArrayList) bugData.get("Bugs"));
return htStore;
=============================================================
And I am trying to call this function as it can capable of fetching the data from the database by "getbugProfiles".
In the new class bugWatcherRefreshAction.java I have coded a part of code which actually clears the caching.Below I am giving the required part of the code:
=============================================================
public void doPerform(RunData rundata, Context context,String str) throws Exception {
JetspeedRunData data = (JetspeedRunData) rundata;
HttpServletRequest request = null;
//PortletConfig pc = portlet.getPortletConfig();
//String userId = request.getRemoteUser();
/*String userId = ((JetspeedUser)rundata.getUser()).getUserName();//sraha on 1/4/05
String pId = request.getParameter("PortletId");
PortalLogger.logDebug("just after pId " +pId); */
//Calling the variable holding the value of portlet id from BugWatcherAction.java
//We are getting the portlet id here , through a variable from BugWatcherAction.java
/*BugWatcherPortletContent bgAct = new BugWatcherPortletContent();
String portletID = bgAct.pId1;
PortalLogger.logDebug("got the portlet ID in bugwatcherRefreshAction:---sraha"+portletID);*/
// updating the bug groups
Hashtable result = new Hashtable();
try {
request = data.getRequest();
String userId = ((JetspeedUser)data.getUser()).getUserName();//sraha on 1/4/05
//String pId = (String)request.getParameter("portletId");
//String pId = pc.getPorletId();
PortalLogger.logDebug("just after pId " +pId);
PortalLogger.logDebug("after getting the pId-----sraha");
result =BugWatcherAPI.getbugList(profileId, userId);
PortalLogger.logDebug("select the new bug groups:: select is done ");
context.put("SelectedbugGroups", profileId);
//start clearing the cache
ContentCacheContext cacheContext = getCacheContext(rundata);
PortalLogger.logDebug("listBugWatcher Caching - removing markup content - before removecontent");
// remove the markup content from cache.
PortletContentCache.removeContent(cacheContext);
PortalLogger.logDebug("listBugWatcher Caching-removing markup content - after removecontent");
//remove the backend content from cache
CacheablePortletData pdata =(CacheablePortletData) PortletCache.getCacheable(PortletCacheHelper.getUserHandle(((JetspeedUser)data.getUser()).getUserName()));
PortalLogger.logDebug("listBugWatcher Caching User: " +((JetspeedUser)data.getUser()).getUserName());
PortalLogger.logDebug("listBugWatcher Caching pId: " +pId);
if (pdata != null)
// User's data found in cache!
PortalLogger.logDebug("listBugWatcher Caching -inside pdata!=null");
pdata.removeObject(PortletCacheHelper.getUserPortletHandle(((JetspeedUser)data.getUser()).getUserName(),pId));
PortalLogger.logDebug("listBugWatcher Caching -inside pdata!=null- after removeObject");
PortalLogger.logDebug("listBugWatcher Caching -finish calling the remove content code");
//end clearing the cache
// after clearing the caching calling the data from the database taking a fn from the portletContent.java
PortalLogger.logDebug("after clearing cache---sraha");
BugWatcherPortletContent bugwatchportcont = new BugWatcherPortletContent();
Hashtable httable= new Hashtable();
httable=(Hashtable)bugwatchportcont.loadContent();
PortalLogger.logDebug("after making the type casting-----sraha");
Set storeKeySet = httable.keySet();
Iterator itr = storeKeySet.iterator();
while (itr.hasNext()) {
String paramName = (String) itr.next();
context.put(paramName, httable.get(paramName));
PortalLogger.logDebug("after calling the databs data from hashtable---sraha");
} catch (CodedPortalException e) {
PortalLogger.logException("bugwatcherRefreshAction:: Exception- ",e);
context.put("Error", CommonUtil.getErrMessage(e.getMessage()));
catch (Exception e) {
PortalLogger.logException("bugwatcherRefreshAction:: Exception- ",e);
context.put(     "Error",CommonUtil.getErrMessage(ErrorConstantsI.EXCEPTION_CODE));
try {
((JetspeedRunData) data).setCustomized(null);
if (((JetspeedRunData) data).getCustomized() == null)
ActionLoader.getInstance().exec(data,"controls.EndCustomize");
catch (Exception e)
PortalLogger.logException("bugwatcherRefreshAction", e);
===============================================================
In the bugwatcher Action there is another function called PostLoadContent.java
here though i have found the portlet Id but unable to fetch that in the bugWatcherRefreshAction.java . I am also giving the code of that function under the bugWatcherAction.Java
================================================
// Get the PortletData object from intermediate store.
CacheablePortletData pdata =(CacheablePortletData) PortletCache.getCacheable(PortletCacheHelper.getUserHandle(
//rundata.getRequest().getRemoteUser()));
((JetspeedUser)rundata.getUser()).getUserName()));
pId1 = (String)portlet.getID();
PortalLogger.logDebug("in the bugwatcher action:"+pId1);
try {
Hashtable htStore = null;
// if PortletData is available in store, get current portlet's data from it.
if (pdata != null) {
htStore =(Hashtable) pdata.getObject(     PortletCacheHelper.getUserPortletHandle(
((JetspeedUser)rundata.getUser()).getUserName(),portlet.getID()));
//Loop through the hashtable and put its elements in context
Set storeKeySet = htStore.keySet();
Iterator itr = storeKeySet.iterator();
while (itr.hasNext()) {
String paramName = (String) itr.next();
context.put(paramName, htStore.get(paramName));
bugwatcherRefreshAction bRefAc = new bugwatcherRefreshAction();
bRefAc.doPerform(pdata,context,pId1);
=============================================================
So this is the total scenario for the fetching the data , after clearing the cache and display that in the portal.I am unable to do that.Presently it is still fetching the data from the cache and it is not going to the database.Even the portlet Id is returning as null.
I am unable to implement that thing.
If you have any insight about this thing, that would be great .As it is very urgent a promt response will highly appreciated.Please send me any pointers or any issues for this I am unable to do that.
Please let me know as early as possible.
Thanks and regards,
Santanu Raha.

Have you run it in a debugger? That will show you exactly what is happening and why.

ClassCastException: You must use ResultSet from this driver!class webl

Hi,
I have configured the Connection pool and DataSources for SQLServer using inet-OPTA
drivers.
I am using the CachedRowSet implementation from inet and it seems to bomb out
with the following error stack trace:
STACK TRACE:
java.lang.ClassCastException: You must use ResultSet from this driver!class webl
ogic.jdbc.rmi.SerialResultSet
at com.inet.tds.CachedRowSet.a(Unknown Source)
at com.inet.tds.CachedRowSet.populate(Unknown Source)
Any ideas of what is causing this problem ?
Is it that i cannot use the CachedRowSet implementation from inet.
If that is the case we have lot of code that uses this and i will have to change
a lot.
Any help is appreciated
Thanks
Venu

The code is in one of the utility classes that is in the classpath and this utility
class is used by the Stateless session EJB that i deployed in the WebLogic AppServer.
As i understand, Weblogic 8.1 is out and i will try running on it.
Thanks
Venu
Joseph Weinstein <[email protected]_this> wrote:
>
>
venu wrote:
Hi,
I am running WebLogic version 7.0.2
Do you have any idea when the 8.1 will be available (i believe it isstill in
beta)
I'll find out. Do answer my other question: Where is this code running
that gets the exception?
Joe
- Srini
Joseph Weinstein <[email protected]_this> wrote:
venu wrote:
Hi,
I have configured the Connection pool and DataSources for SQLServerusing inet-OPTA
drivers.
I am using the CachedRowSet implementation from inet and it seems
to
bomb out
with the following error stack trace:
STACK TRACE:
java.lang.ClassCastException: You must use ResultSet from this driver!classwebl
ogic.jdbc.rmi.SerialResultSet
at com.inet.tds.CachedRowSet.a(Unknown Source)
at com.inet.tds.CachedRowSet.populate(Unknown Source)
Any ideas of what is causing this problem ?
Is it that i cannot use the CachedRowSet implementation from inet.
If that is the case we have lot of code that uses this and i will
have
to change
a lot.
Any help is appreciated
Thanks
VenuHi. What version of the server are you using. This problem will goaway
for 8.1.
We currently wrap all JDBC objects from pooled drivers, to maintaincontrol
over
the pooled connection. Where is this code running that gets the exception.
It seems that Inet's rowset implementation needs to cast the resultset
it gets
to be inet's result set object, in order to make some non-standardmethod
calls.
Joe

How to pass a HTTP request from a simple java class

Is it possible to pass an HTTP request from a simple java class.if yes how?

Is it possible to pass an HTTP request from a simple
java class.if yes how?If you're talking about creating a HttpRequest object and passing it to a servlet, that would be a red flag to me that your design is flawed. You shouldn't have to do that - the application server (Tomcat, Weblogic, etc) should be the only thing that has to worry about creating that kind of object and passing it to you.

J2ME error to get value from variable in another class

hi,,
i write code for a mobile application like a tour guide..
i had create 5 class for this application, KutaBeachDictionary MIDlet class, ListMainMenu List class, ListMenuHotel List class, HotelDes01 Form class and the last Hotel class that store all information.
the problem is, i have [choose] variable in ListMenuHotel that contain getSelectedIndex() value, i want to take [choose] value from ListMenuHotel class to [index] variable in HotelDes01, so it determine the name of hotel that will display in form.but the index always 0 although i had choosen different menu from ListMenuHotel..
here is all code
in MIDlet class
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
public class KutaBeachDictionary extends MIDlet {
 public KutaBeachDictionary() {
 lstMenuUtama = new ListMenuUtama(this);
 lstMenuHotel = new ListMenuHotel(this);
 htlDes1 = new HotelDes01(this);
 frmLoading = new FormLoading(this);
 public Display getDisplay() {
 return Display.getDisplay(this);
 public void exitMIDlet() {
 switchDisplayable(null, null);
 destroyApp(true);
 notifyDestroyed();
 public void startApp() {
 if (midletPaused) {
 resumeMIDlet();
 } else {
 initialize();
 startMIDlet();
 midletPaused = false;
 getDisplay().setCurrent(frmLoading);
 new Thread(frmLoading).start();
 frmLoading.done = false;
 frmLoading.gLoading.setValue(0);
 public void pauseApp() {
 midletPaused = true;
 public void destroyApp(boolean unconditional) {
 private boolean midletPaused = false;
 public ListMenuHotel lstMenuHotel;
 public ListMenuRestaurant lstMenuRestaurant;
 ListMenuUtama lstMenuUtama;
 FormAbout frmAbout;
 public HotelDes01 htlDes1;
 FormLoading frmLoading;
}the code in ListMenuHotel
import java.io.IOException;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.Ticker;
public class ListMenuHotel extends List implements CommandListener {
 Hotel objHotel = new Hotel();
 ListMenuHotel(KutaBeachDictionary run) {
 super("List Hotel", List.IMPLICIT);
 this.run = run;
 try {
 btnImage = Image.createImage("/btnImage.png");
 } catch (IOException e) {
 tickerMenu = new Ticker("Daftar Hotel di Pantai Kuta Bali");
 setTicker(tickerMenu);
 for (int i = 0; i < objHotel.namaHotels.length; i++) {
 append(objHotel.namaHotels, btnImage);
addCommand(new Command("Select", Command.OK, 0));
addCommand(new Command("Back", Command.BACK, 0));
setCommandListener(this);
public void commandAction(Command cmd, Displayable dsp) {
if (cmd == SELECT_COMMAND) {
choose = getSelectedIndex();
Display.getDisplay(run).setCurrent(run.htlDes1);
switch (cmd.getCommandType()) {
case Command.BACK:
Display.getDisplay(run).setCurrent(run.lstMenuUtama);
break;
public int getChoose() {return choose;}
private KutaBeachDictionary run;
private Image btnImage;
private Ticker tickerMenu;
private int choose;
the code in HotelDes01 Form classimport java.io.IOException;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
public class HotelDes01 extends Form implements CommandListener {
private KutaBeachDictionary run;
private int index;
private Hotel isiHotel = new Hotel();
public HotelDes01(KutaBeachDictionary run) {
super("Inna Kuta Hotel");
index = run.lstMenuHotel.getChoose(); //here is the problem..the value remain 0 althought i choose another??!!
this.run = run;
Image imgHotel = null;
String namaHotel = "\n" + isiHotel.namaHotels[index] + "\n";
try {
imgHotel = Image.createImage("/HotelImage/interface/htlDes1.png");
} catch (IOException e) {
append(new ImageItem(null, imgHotel, ImageItem.LAYOUT_CENTER, null));
append(namaHotel);
addCommand(new Command("Back", Command.BACK, 0));
setCommandListener(this);
public void commandAction(Command cmd, Displayable dsp) {
switch (cmd.getCommandType()) {
case Command.BACK:
Display.getDisplay(run).setCurrent(run.lstMenuHotel);
break;
can someone fix the code,, i had tried so many ways,,but completely failure.. T_T
Edited by: diaca on Mar 22, 2010 7:55 AM
Edited by: diaca on Mar 22, 2010 8:01 AM

hei bro,i had solved the problem :)
the problem is , i had constructed the form of hotelDes01 each time the program starting with this code
public class KutaBeachDictionary extends MIDlet {
 public KutaBeachDictionary() {
 //.. declaring several new object
 htlDes1 = new HotelDes01(this);
 //..another procedure like startApp, pauseApp, etc
public HotelDes01 htlDes1;
}i think if i declare this class in the beginning it never updated the index value
so i delete the code above, and i declare the htlDes1 in the listMenuHotel like this:
public class ListMenuHotel extends List implements CommandListener {
 //..several code just like before
public void commandAction(Command cmd, Displayable dsp) {
 if (cmd == cmdSelect) {
 objHotel.setChoose(getSelectedIndex()); //i change the code like this
 showInformation();
 if (cmd == cmdBack) {
 Display.getDisplay(run).setCurrent(run.lstMenuUtama);
 public void showInformation() {
 HotelDescription htlDes1 = new HotelDescription(run); //reconstruct the object in the class ListMenuHotel
 Display.getDisplay(run).setCurrent(htlDes1); //display the object
 }so the form of hotelDes01 now always reconstruct whenever user change the election in ListMenuHotel class and now index value get updated.. :D
thanks for trying to fix the code qnat..
this is my coursework, so i get to finish it ASAP..

Running a "heavy" program from within a java class

Dear Java programmers,
I 'm trying to run a software called surflex from within a java class, using the following java command:
Runtime.getRuntime().exec( new String[ { "/bin/bash", "docking_script_2.bash"} );
For convenience I've created the following simple bash script but for some strange reason surflex is not executed:
#!/bin/bash
surflex-dock-v211-linux.exe proto drug.mol2 receptor_hydro.mol2 p1;
surflex-dock-v211-linux.exe dock drug.mol2 p1-protomol.mol2 receptor_hydro.mol2 >& 1OHR_A_output.txt;
Can anybody help me on that (ignore the arguments, they are correctly set)? I'll try to find another, more generic example, but so far I've noticed that the same thing happens with unix grep command.
thanks,
Tom

I think if you want to invoke a bash shell and give it a command to execute, you need to do
/bin/bash -c commandrather than
/bin/bash commandAccordingly, your call to exec should look like
exec( new String[ { "/bin/bash", "-c" "docking_script_2.bash"} );Beyond, that, I'd suggest the following as general debugging tips and best practices:
* As the first line of the bash script, include a line that does something simple, like touch a file, so you can see if the script is executing at all.
* In Java, call Process.waitFor(). Its return value is the process' exit value.
* Make sure you're gobbling stdout and stderr from the process, and giving stdin any input it needs. You'll have to do this for the process to run correctly, and you can also use what you read from stdout and stderr to debug the execution of the process. [http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html]
* You may wan to look into ProcessBuilder, rather than Runtime.exec. I haven't used it myself yet, but apparently it's supposed to be the preferred way to execute external processes.

How can i change the class in the Class Library project to be static or public so i can use it from the windows application project ?

First i know that when i make any changes to the class library project i need to rebuild the project then to remove the Capture.dll from the TestScreenshot project and then to add again the updated Capture.dll
The problem for example in this case i'm trying to use a public static variable i add in the DXHookD3D9.
In the DXHookD3D9 i added this public static variable:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//using SlimDX.Direct3D9;
using EasyHook;
using System.Runtime.InteropServices;
using System.IO;
using System.Threading;
using System.Drawing;
using Capture.Interface;
using SharpDX.Direct3D9;
namespace Capture.Hook
internal class DXHookD3D9: BaseDXHook
public DXHookD3D9(CaptureInterface ssInterface)
: base(ssInterface)
LocalHook Direct3DDevice_EndSceneHook = null;
LocalHook Direct3DDevice_ResetHook = null;
LocalHook Direct3DDevice_PresentHook = null;
LocalHook Direct3DDeviceEx_PresentExHook = null;
object _lockRenderTarget = new object();
Surface _renderTarget;
public static decimal framesperhourtodisplay = 0;
protected override string HookName
get
return "DXHookD3D9";
List<IntPtr> id3dDeviceFunctionAddresses = new List<IntPtr>(
framesperhourtodisplay
The problem is i can't even get to the Capture.Hook namespace and not to the DXHookD3D9 from the TestScreenshot application window project.
This is a screenshot:
For example fro the FramesPerSecond class i can use it get to it from the windows forms application.
namespace Capture.Hook
/// <summary>
/// Used to determine the FPS
/// </summary>
public class FramesPerSecond
int _frames = 0;
int _lastTickCount = 0;
float _lastFrameRate = 0;
Since it's public i guess.
But if i will change the DXHookD3D9 class from internal to public:
public class DXHookD3D9: BaseDXHook
I will get error on the DXHookD3D9:
Error 1
Inconsistent accessibility: base class 'Capture.Hook.BaseDXHook' is less accessible than class 'Capture.Hook.DXHookD3D9'
And the BaseDXHook class:
namespace Capture.Hook
internal abstract class BaseDXHook: IDXHook
protected readonly ClientCaptureInterfaceEventProxy InterfaceEventProxy = new ClientCaptureInterfaceEventProxy();
public BaseDXHook(CaptureInterface ssInterface)
this.Interface = ssInterface;
this.Timer = new Stopwatch();
this.Timer.Start();
this.FPS = new FramesPerSecond();
Interface.ScreenshotRequested += InterfaceEventProxy.ScreenshotRequestedProxyHandler;
Interface.DisplayText += InterfaceEventProxy.DisplayTextProxyHandler;
InterfaceEventProxy.ScreenshotRequested += new ScreenshotRequestedEvent(InterfaceEventProxy_ScreenshotRequested);
InterfaceEventProxy.DisplayText += new DisplayTextEvent(InterfaceEventProxy_DisplayText);
~BaseDXHook()
Dispose(false);
How can i solve it so i can use the variable framesperhourtodisplay in the DXHookD3D9 class with the TestScreenshot windows forms application ?

Hi,
I dont know if it will work here, since I dont know the complete structure, but the base call must be public, if the derived class is public, so the base class is at least as accessible as the derived class.
Try make the base class public. (And maybe the base-class IDXHook of the base also...)
Or use a different approach and make only the properties public that are needed to be public by adding an extra class...
A structure could look like:(you need to create a class thats public in your dll and expose a property, and set this property in the internal class...)
In the Accessing class (here Form1)
public partial class Form1 : Form
public Form1()
InitializeComponent();
private void Form1_Load(object sender, EventArgs e)
C c = new C();
MessageBox.Show(B.F.ToString());
and in the class Lib:
internal class A
public A()
B.F = DateTime.Now.Millisecond;
public class B
public static int F { get; set; }
public class C
public C()
A a = new A();
(add a referenc to the class lib from the accessing project)
Regards,
Thorsten

Flex/AS3 Best way to construct a derived class instance from an existing base class instance?

What is the best way to handle the instantiation of a derived class from an existing base class.
I have a base class which is being created via remote_object [RemoteClass alias] from the server. I have other specialized classes that are derived from this baseclass, but serialization with the server always happens with the base class. The base class has meta data that defines what the derived class is, for example
[RemoteClass (alias="com.myco...')]
public Class Base
 public var derivedType:String;
 public function Base()
public Class Derived extends Base
 public "some other data"
 public function Derived()
In my Cairgorm command which retrieves this object from ther server I want to do this:
public function result (event: Object):void
 var baseInstance:Base = event.result;
 if (baseInstance.derivedType = "derived")
 var derivedInstance:Derived = new Derived( baseInstance );
What is the most efficient way of doing this? It appears to me that doing a deep-copy/clone and instantiation of the derived class is pretty inefficient as far as memory allocation and data movement via the copy.

Thanks for the assistance. Let me try to clarify.
MY UI requires a number of composite classes. The individual components of the composite classes are being transfered to/from the server at different times depending upone which component has changed state. The construction of the composite classes from the base class happens in my clients business logic.
Composition happens in a derived class; but server syncronization happens using the base class. When I recieve the object from Blazeds through the remote object event, it is in the form of the base class. I then need to instantiate the derived class and copy the elements of the base class into it (for later composite construction). And likewise when sending the base class back to the server, I need to upcast the derived class to its base class. But in this case just a mere upcast does not work. I actually need to create a new base class and copy the attrbutes into it. I believe this is limitation of how remoting works on Flex/AS3.
My question is, what is the best way to turn my base class into it's derived class so further composite construction can take place. The way I am currently doing it is to create a load method on the base class, that takes the base class as on argument. The load function, copies all of the instance attribute references from the base class to the target class.
public Class Base
 public function Base()
 public function load(fromClass:Base)
 { // copy the references for all of the instance attributes from the fromClass to this class }
Then, after I recieve the base class from the server. I create a new derived class and pass the base class into the load function like this:
 for (var i:int=0; i < event.result.length; i++) {
 var derived:Derived = new Derived();
 derived.load(event.result[i]);
The drawbacks of this approach is that it now requires 2 extra instance creations per object serialization. One on recieving the object from the server and one sending it to the server. I assume copying references are pretty efficient. But, there is probably some GC issues. The worst of it is in code maintenance. The load function now has to be manually maintained and kept in sync with the server class.
It would be interesting to hear how others have solved this problem. The server side is an existing application with around 2M LOC, so changing the code on the server is a non-starter.
Thanks for your help.

From which table I can find the "Class type" and "Class" of the material?

From which table I can find the "Class type" and "Class" of the material?
Thanks in advance for the answers....

Hi,
try following table
KSSK     Material number to class
KLAS     Class description
KSML     Characteristic name
CABN/CABNT     Characteristic name description
CAWN/CAWNT     Characteristic name
[http://www.sap-img.com/materials/classification-view-of-material-master.htm]
[http://wiki.sdn.sap.com/wiki/display/ERPLO/FrequentlyUsedTables]
Regards
kailas Ugale

Access parent class from instance of nested class

Hi,
I have the following class hierarchy:
public class BaseClass
public class ParentClass
private NestedClass    mNestedClass;
public ParentClass()
    mNestedClass = new NestedClass();
protected NestedClass getNestedClass()
    return mNestedClass;
public static BaseClass createParentClass()
    parentClass = new ParentClass();
    // some code...
    return parentClass.getNestedClass();
protected class NestedClass extends BaseClass
    NestedClass( int i )
      // some other code...
}I cannot modify the classes above, as they are third-party and they are subject to changes...
In my code, I may only use the static method to create an instance of ParentClass, because there is some important code (not accessible outside of the package) instead of the comments. The problem is that the static method only returns me an instance of the NestedClass, but not the ParentClass. For some reasons, I would need to access the instance of ParentClass.
Is there a way (Java syntax, I mean) that would allow me to access from an instance of NestedClass the corresponding ParentClass instance?
I know that inside a NestedClass method I may use ParentClass.this, but, as I wrote above, that class cannot be modified. Worse, I am not able to extend it neither, because the constructor is not public (or at least protected)...
Please, does anybody have the correct answer?
Thanks,
Adrian

There are at least 3 funny things in the code you posted:
1) an instance of NestedClass cannot be created with "new NestedClass()", because the only constructor is NestedClass(int)
2) I can't see why a method called "createParentClass" should return an instance of NestedClass
3) The funniest: I really can't understand why you "may only use the static method to create an instance of ParentClass": if the ParentClass developer didn't want you to instantiate it directly, why did he made the constructor public?
But the fact is there's no way to access the enclosing object of a nested object if the sw architect didn't want this (maybe including in the interface a method like this:
class EnclosingClass {
class NestedClass {
   EnclosingClass getEnclosingObject() {
    return EnclosingClass.this;
This simply should break encapsulation and object hyerarchy security... really a bad thing I guess!!
Bye

Access a mc or textfeild from a non document class.

Hey all.
This use to be simple in as2, but seems to allude me from as3. It used to be simple to access an object you put on the stage like a mc or dynamic text field by simply using _root.instanceName ect. Now I see references to making references to the Stage and such like:
private var stage:Stage;
stage = stageRef;
and I am still confused.
What I have going on is, I have placed a movieclip on the stage in Flash and gave it an instance name of Cell_mc.
I have a cusom class that extends MovieClip with the following imports
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.MouseEvent;
import flash.events.TimerEvent;
import flash.utils.Timer;
This Class is tied to a set of MovieClips in my Library.
I have a listener: this.addEventListener(MouseEvent.MOUSE_DOWN,pickUp);
And a function:
private function pickUp(event:MouseEvent):void
                  this.startDrag();
                  _interval = new Timer(100);
                  _interval.addEventListener(TimerEvent.TIMER,onInterval);
                  _interval.start();
And
private function onInterval(event:TimerEvent):void
                  //Set up hit test
                  this.hitArea(Cell_mc)
                        trace("hit");
I get the following error whenever I try to access an object I placed on the stage from anywhere other than the document class:
1120: Access of undefined property Cell_mc.
How do I access the cell_mc that is already on the stage from this non-document class?
Thanks guys.

try:
private var stage:Stage;
stage = stageRef;
and I am still confused.
What I have going on is, I have placed a movieclip on the stage in Flash and gave it an instance name of Cell_mc.
I have a cusom class that extends MovieClip with the following imports
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.MouseEvent;
import flash.events.TimerEvent;
import flash.utils.Timer;
This Class is tied to a set of MovieClips in my Library.
I have a listener: this.addEventListener(MouseEvent.MOUSE_DOWN,pickUp);
And a function:
private function pickUp(event:MouseEvent):void
                  this.startDrag();
                  _interval = new Timer(100);
                  _interval.addEventListener(TimerEvent.TIMER,onInterval);
                  _interval.start();
And
private function onInterval(event:TimerEvent):void
                  //Set up hit test
                  this.hitArea(MovieClip(root).Cell_mc)
                        trace("hit");
I get the following error whenever I try to access an object I placed on the stage from anywhere other than the document class:
1120: Access of undefined property Cell_mc.
How do I access the cell_mc that is already on the stage from this non-document class?
Thanks guys.

How to refer to enclosing instance from within the member class?

Hi
How to refer to the enclosing instance from within the member class?
I have the following code :
import java.awt.*;
import java.awt.event.*;
public class MyDialog extends Dialog
     public MyDialog(Frame fr,boolean modal)
          super(fr,modal);
          addWindowListener(new MyWindowAdapter());
     public void paint(Graphics g)
          g.drawString("Modal Dialogs are sometimes needed...",10,10);
     class MyWindowAdapter extends WindowAdapter
          public void windowClosing(WindowEvent evt)
               //MyDialog.close(); // is this right?
In the above code, how can I call the "close()" method of the "Dialog" class (which is the enclosing class) from the inner class?
Thanks in advance.
Senthil.

Hi Senthil,
You can directly call the outer class method. Otherwise use the following way MyDialog.this.close(); (But there is no close() method in Dialog!!)
If this is not you expected, give me more details about problem.
(Siva E.)

JPA Toplink, class cast exception when casting class A to class A

I get a really strange exception from Toplink JPA. I used netbeans to create a persistence.xml and I generated a class (entity) from the table in a DB. Everything works fine, when I create a select query, I get the list of objects and the list is correctly typed. I can the objects in the list in debug mode with every field correctly set. But then I need to start working with the list, so I iterate through the list. And then I get ClassCastException from class A to class A (when A is the canonical name of the entity class).
I was working with JPA for some time but never seen that. I am using glassfish v2, mysql, netbeans 6.1. I could post the classes and persistence xml, but persistence.xml is really simple (no class definitions) and the class is annotated by netbeans. Every field is annotated like this:
@Column(name = "name", nullable = false)
And Date columns have
@Temporal(TemporalType.TIMESTAMP)
The whole class is annotated with @Table.
Does anyone has any idea, what can be wrong?

DrClap wrote:
Make sure your URLClassLoader cannot load the IAdapter class.
That is not exactly correct. He needs to make sure his URLClassloader has access to the IAdapter class. Sure, it should not load it on its own, but if requested the URLClassloader should be able to ask a parent to load IAdapter. Which in the end looks the same. But is not the same.
So set the parent classloader of your URLClassloader to a classloader capable of loading IAdapter.

Transfer Asset from Non Depreciating Asset Class to Depreciating Asset Clas

We use the fixed asset subledger to maintain patents and patent applications. The patent applications do not amortize. How do I transfer from the patent application class to the patent class which will begin to amortize?

Hi, it can be done in accordance with your bs requirements, it's the same like transfer from auc to asset

Cast from Class A to Class A B should be allowed?

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