Extended a class, getting a class cast error

Hi all,
I'm writing a program that uses a closed-source jar in its library (with permission, of course).
One of the classes in that jar wasn't working as I wanted it to, so I extended the class and overwrote one of its methods. So, when using the class, instead of callingThirdPartyClass obj = new ThirdPartyClass();I could useMyThirdPartyClass obj = new MyThirdPartyClass();This seems to work, until a certain line of their code throws a class cast exception:
java.lang.ClassCastException: org.thirdparty.ThirdPartyClass$2
     at org.thirdparty.Event.findTop(Event.java:279)
     at org.thirdparty.ThreadUtils$4.run(ThreadUtils.java:86
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
    ....Why does this occur? Surely, since MyThirdPartyClass is a child of ThirdPartyClass, anything that expects a ThirdPartyClass shouldn't have any problem, right? Or do I have that backwards? And if so, is there anything I can do to fix the problem?
Thanks!
Sam

paulcw wrote:
Specifically, the ThirdPartyClass itself was an extension of a JApplet. Since I wanted to use it directly in my code, I couldn't set the applet's parameters, so I overwrote the getParameters(String) method to return strings of my choosing.Your approach makes little sense to me. Applets follow a well-defined lifecycle. If you wanted to embed the applet into your own application, all you have to do is use the applet following its lifecycle (that is, instantiate it, set the context, invoke init and start and stop and destroy). Overriding anything should not be necessary.That's exactly what I want to do. However, the applet requires one parameter to be set (DefaultModel = some url) -- if this isn't set I can't run the applet. As far as I can tell (and I have an as-yet unanswered question in the Applets forum asking about this), there is no way to set the parameters in an Applet in any way besides putting in in the 'param' tag in the Applet code in the HTML.
If I'm wrong about that, please let me know.
On the assumption that I was right, I decided to extend the getParameters(String) method, so that it would return the desired String when asked. Naturally, to do this, I had to extend the entire class.
This solved the problem of the program failing when it asked for the parameter, but then it failed when it checked the codebase. I overrode the getCodeBase() method, and the applet no longer had a problem there.
Then I got the exceptions I got above.
I'm fairly certain (but, naturally, not 100% certain of anything) that neither of my methods should have affected the inner-workings of LiteApplet -- I was overriding methods that were from Applet (and not overridden in LiteApplet, I checked) that are just supposed to pass back strings -- the same Strings that would be passed back if it were embedded in a web page -- and not affect the applet in any way.
Naturally, I'm wrong about one or more of my assumptions above, but I just can't work out how overriding those two methods could have created the error that I'm getting.
Sam
PS: Here is the entire exception, if you think it could help. I was scrubbing it merely so as not to confuse matters and make my posts overly long. The last exception below gets repeated indefinitely.
AutoConverter.runVisitor() failed: CREATE-SUN expected 2 inputs, a number and a command block (optional).
java.lang.NullPointerException
     at org.nlogo.swing.OptionDialog.show(OptionDialog.java:36)
     at org.nlogo.window.GUIWorkspace$11.handleError(GUIWorkspace.java:1125)
     at org.nlogo.compiler.AutoConverter.convert(AutoConverter.java:161)
     at org.nlogo.window.ProceduresLite.handleLoadSectionEvent(ProceduresLite.java:44)
     at org.nlogo.event.LoadSectionEvent.beHandledBy(LoadSectionEvent.java:38)
     at org.nlogo.event.Event.doRaise(Event.java:215)
     at org.nlogo.event.Event.raise(Event.java:116)
     at org.nlogo.window.ModelLoader.loadHelper(ModelLoader.java:76)
     at org.nlogo.window.ModelLoader.load(ModelLoader.java:45)
     at org.nlogo.window.LiteApplet.go(LiteApplet.java:128)
     at org.nlogo.window.LiteApplet$1.run(LiteApplet.java:26)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
java.lang.ClassCastException: org.nlogo.window.CompilerManager
     at org.nlogo.event.Event.findTop(Event.java:279)
     at org.nlogo.event.Event.doRaise(Event.java:190)
     at org.nlogo.event.Event.raise(Event.java:116)
     at org.nlogo.window.CompilerManager.compileAll(CompilerManager.java:68)
     at org.nlogo.window.CompilerManager.handleLoadEndEvent(CompilerManager.java:61)
     at org.nlogo.event.LoadEndEvent.beHandledBy(LoadEndEvent.java:11)
     at org.nlogo.event.Event.doRaise(Event.java:215)
     at org.nlogo.event.Event.raise(Event.java:116)
     at org.nlogo.window.ModelLoader.loadHelper(ModelLoader.java:115)
     at org.nlogo.window.ModelLoader.load(ModelLoader.java:45)
     at org.nlogo.window.LiteApplet.go(LiteApplet.java:128)
     at org.nlogo.window.LiteApplet$1.run(LiteApplet.java:26)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
java.lang.ClassCastException: org.nlogo.window.LiteApplet$2
     at org.nlogo.event.Event.findTop(Event.java:279)
     at org.nlogo.event.Event.doRaise(Event.java:190)
     at org.nlogo.event.Event.raise(Event.java:116)
     at org.nlogo.window.GUIWorkspace$6.run(GUIWorkspace.java:660)
     at org.nlogo.window.ThreadUtils$2.run(ThreadUtils.java:37)
     at org.nlogo.window.ThreadUtils$4.run(ThreadUtils.java:86)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Similar Messages

Having problems linking two java classes getting a "deprecated API" error??

Hi,
I am tryin to link one page to another in my program, however i get the followin msg:-
Project\alphaSound.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.
Process completed.
this only happens when i add the bold piece of code to the class; even though the italic piece of code does take you to a new page?:-
public class alphaSound extends JPanel implements ActionListener
{static JFrame f = new JFrame("AlphaSound");
public alphaSound() {
public void actionPerformed(ActionEvent event) {
             Object source = event.getSource();
else if(source == vowel)
{ Vowelm vm = new Vowelm();
vm.setSize(Toolkit.getDefaultToolkit().getScreenSize());
vm.show();
f.dispose();
else if(source == back)
{ MainPage main = new MainPage();
main.setSize(400,300);
main.show();
f.dispose();}
public static void main(String s[]) {
        WindowListener l = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        //JFrame f = new JFrame("AlphaSound");
        f.addWindowListener(l);
        f.getContentPane().add(new alphaSound());
        f.setSize(Toolkit.getDefaultToolkit().getScreenSize());
        f.show();
}here is the class its tryin to call
public class Vowelm extends JPanel implements ActionListener
{static JFrame v = new JFrame("VowelSound");
   public Vowelm() {
                                               ..etc...
public static void main(String s[]) {
        WindowListener l = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        //JFrame f = new JFrame("VowelSound");
        v.addWindowListener(l);
        v.getContentPane().add(new VowelmSound());
        v.setSize(Toolkit.getDefaultToolkit().getScreenSize());
        v.show();
}Im pretty sure ther is some conflict between the two classes due to the way they are called and designed?
Hope you can help!
Kind Regards
Raj

You may want to check your show() calls and see if
they can be replaced with setVisible(). Forexample,
in your Vowelm code, you have a static JFrame v.
At
the end of your main function, you use v.show().As
of JDK1.1, this has been deprecated in favour of
setVisible(boolean).hey show() in JFrame is from Window and in windowits
not deprecated ..
show is not decrecated thats for sure ... i dontknow
y you said that ...
you can look in docs as well..
True - but this in turn overrides show() from
java.awt.Component, which has been deprecated. My
guess is that's where the problem comes from.
Thanks for the Dukes!
FlicAnd then again - perhaps not. After looking into this a bit more, I take back my last comment about the Component override. However, as I said in my original reply, compiling with -deprecation should tell you which show() call is flagging the error. There is definitely one somewhere that the JVM doesn't like - without seeing your complete code, it's hard to say exactly where. Based on what you've posted, my guess is that it is within the Vowelm class.
Next time, I'll try to avoid 'shooting from the hip'.
Again, thanks for the Dukes,
Flic

Class with interface, extends Sprite, but get compile error accessing "visible"

Here is the situation:
- Class MyLoader extends Sprite implements ILoader
The class extends Sprite and works perfectly.
var _loader:DisplayObject = new MyLoader();
_loader.visible = true;
Works perfectly.
var _loader:ILoader = new MyLoader();
_loader.visible = true;
Casts a compiler error. Cannot access static property "visible" to a ILoader etc. etc.
Doesn't make much sense to me, since the class extends a Sprite anyway...
Am I missing something?
thanks
Filippo

cast _loader as a Sprite (or DisplayObject);
the flash compiler needs help remembering what's what.
var _loader:ILoader=...
Sprite(_loader).visible=true;

Class cast Errors....

Here are two classes
- AnimalStrutsForm.java
- AnimalStrutsAction.java
package AnimalStruts;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
public class AnimalStrutsForm extends ActionForm {
     private String textbox1 = null;
     public String getextbox1() {
          return textbox1;
     public void setTextbox1(String text) {
          this.textbox1 = text;
     @Override
     public void reset(ActionMapping arg0, HttpServletRequest arg1) {
     @Override
     public ActionErrors validate(ActionMapping arg0, HttpServletRequest arg1) {
          System.out.println("I am in validate--AnimalStrutsForm");
          return super.validate(arg0, arg1);
package AnimalStruts;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import AnimalStruts.*;
public class AnimalStrutsAction extends Action {
     @Override
     public ActionForward execute(ActionMapping mapping,
               ActionForm Form, HttpServletRequest request,
               HttpServletResponse response) throws Exception {
          System.out.println("In Animal Action forward.execute");
          AnimalStrutsForm form=new AnimalStrutsForm();
          form.setTextbox1("cat");
          String str=form.getextbox1();
          System.out.println("-----> "+str);
          return mapping.findForward("success");
First I compile AnimalStrutsForm.java.. I get no errors or warning
But when I compile AnimalStrutsAction.java I get following erros
AnimalStrutsAction.java:22: cannot find symbol
symbol : class AnimalStrutsForm
location: class AnimalStruts.AnimalStrutsAction
                AnimalStrutsForm form=new AnimalStrutsForm();
                ^
AnimalStrutsAction.java:22: cannot find symbol
symbol : class AnimalStrutsForm
location: class AnimalStruts.AnimalStrutsAction
                AnimalStrutsForm form=new AnimalStrutsForm();
                                          ^Any help will be highly appreciated.

It tried to add the AnimalStrutsForm.class in classpath.. but it didn't work as well..
The code I specified was a lill bit wrong.. the right code chunk is as under.
public class AnimalStrutsAction extends Action {
     @Override
     public ActionForward execute(ActionMapping mapping,
               ActionForm Form, HttpServletRequest request,
               HttpServletResponse response) throws Exception {
          System.out.println("In Animal Action forward.execute");
          AnimalStrutsForm form=(AnimalStrutsForm) Form;
          //String animalName=form.getAnimalName();
          return mapping.findForward("category");
     }

Opening Build Specification - Error 7 occurred at Get LV Class Default Value.vi

I recently ported my project to a new PC. Everything seems to run fine uncompiled, and I am able to build an executable without issue. However, my build specification shows up in the project explorer with question mark next to it. When I try to build again or edit the properties I get a popup with the information below:
Error 7 occurred at Get LV Class Default Value.vi
Possible reason(s):
LabVIEW: File not found. The file might be in a different location or deleted. Use the command prompt or the file explorer to verify that the path is correct.
=========================
NI-488: Nonexistent GPIB interface.
Complete call chain:
Get LV Class Default Value.vi
AB_UI_Initialize_Framework.vi
AB_UI_FRAMEWORK.vi
AB_Item_OnDoProperties.vi
AB_Item_OnDoProperties.vi.ProxyCaller
LabVIEW attempted to load the class at this path:
<Empty Path>
I've seen messages from people getting the same error when trying to run a compiled executable, but mine actually runs fine. I am just unable to open the build specification to rebuild or edit its properties.

This application is for a Windows machine, and I am not using the Report Generation Toolkit. However, I shut down my computer last night and when I booted it up this morning my Build Specification now opens fine and I am able to edit it. My only thought as to why it occured in the first place is that I had added several files to user.lib and instr.lib and restarted LabVIEW, but it appears that it required my computer to be restarted as well.

Error 7 occurred at Get LV Class Default Value.vi only in my executable for Print Report - LV 2010 SP1

I have a program written which uses the print report function. Everything works fine in the uncompiled code, my report prints just fine. I can compile my project all the way to a full installer. When I run the executable I get the error:
Error 7 occurred at Get LV Class Default Value.vi
With the following text:
Possible reason(s):
LabVIEW: File not found. The file might have been moved or deleted, or the file path might be incorrectly formatted for the operating system. For example, use \ as path separators on Windows, : on Mac OS X, and / on Linux. Verify that the path is correct using the command prompt or file explorer.
=========================
NI-488: Non-existent board.
Complete call chain:
     Get LV Class Default Value.vi
     NI_report.lvclass:New Report.vi
     print report.vi
     EMS V3.0 streamline.vi
LabVIEW attempted to load the class at this path:
H:\InMotion\EMS\builds\EMS_01\Emissions Analyzer\EMS.exe\1abvi3w\vi.lib\Utility\NIReport.llb\Standard Report\NI_Standard Report.lvclass
"EMS V3.0 streamline.vi" is my main vi, "print report.vi" is the subvi that creates and prints the report based on all the information sent to it. I get no warning when I compile this to an executable. I already tried repairing both LV SP1 and the report generator toolkit. No change after I compile to an exe.
Any help would be appreciated. Thanks.
Garrett Herning

Ok, I tried that... and now I get an error when I try to compile to an executable... This is right at the end of the build and will not let me build an executable.
Error:
An error has occurred. Expand the Details section for more information.
Details:
Visit the Request Support page at ni.com/ask to learn more about resolving this problem. Use the following information as a reference:
Error 7 occurred at Invoke Node in AB_Build.lvclass:Copy_Files.vi->AB_Application.lvclass:Copy_Files.vi->AB_EXE.lvclass:Copy_Files.vi->AB_Build.lvclass:Build.vi->AB_Application.lvclass:Build.vi->AB_EXE.lvclass:Build.vi->AB_Engine_Build.vi->AB_Build_Invoke.vi->AB_Build_Invoke.vi.ProxyCaller
Possible reason(s):
LabVIEW: File not found. The file might have been moved or deleted, or the file path might be incorrectly formatted for the operating system. For example, use \ as path separators on Windows, : on Mac OS X, and / on Linux. Verify that the path is correct using the command prompt or file explorer.
=========================
NI-488: Non-existent board.
Method Name: Linker:Write Info To File

When I click on firefox I get a java script error that says "TypeError: Components.classes[TvtPwmComponent_CID] is undefined", what does that mean?

Whenever I click on firefox, or when a pop-up occurs, I get a java script error that says, "TypeError: Components.classes[TvtPwmComponent_CID] is undefined". I don't know why. It first occurred while I was on ESPN while trying to watch college games live.

This issue can be caused by an extension that isn't working properly.
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode

How to get the .class file for the extended Controller .java file

Hi,
I did the below steps.
1. Created New OAWorkspace
2. Created New project
3. Imported the page .xml file
4. Added new .java file by extending the controller class
5. Added code in the .java file.
6. Ran the .xml file
As I copied all the folders from Unix box, the page was opened.
But My question was where can I see the .class file the extended controller. It's a .java file. How to compile and get the .class file for this .java file. If I get this .class file, I can go to the page and click the personlize page. and change the Controller name to the new path by ftp ing the new class to the cust.oracle.apps.pos.changeorder.webiui.
Please let me know how to create the .class file.
Thanks,
HP

All are Java files are stored in JDEV_INSTALL_DIR:\jdevhome\jdev\myprojects\
In your case the path java would be
JDEV_INSTALL_DIR:\jdevhome\jdev\ myprojects \cust\oracle\apps\pos\changeorder\webui\
AND
Once you compile the java file in Jdeveloper, Class files get generated @ below path
In your case the path of class would be
JDEV_INSTALL_DIR:\jdevhome\jdev\ myclasses \cust\oracle\apps\pos\changeorder\webui\
Duplicate Thread-
Thanks
--Anil
http://oracleanil.blogspot.com/

Please help how to set/get a class object in hashtable or hashmap?

Hi, everybody.
I'd like to generate a class-object list in hashtable.
However, compilation is error. Here is my code:
Hashtable ht = new Hashtable();
Class tmp_obj;
tmp_obj = Class.forName("my_class_name_1");
ht.put("my_class_name_1", tmp_obj);
tmp_obj = Class.forName("my_class_name_2");
ht.put("my_class_name_2", tmp_obj);
Class selected_object = ht.get("my_class_name");
^here compilation error: incompitable types
Could anybody tell me where is wrong in my code and how to
correct it?
Thank you in advance.
Jeff

Look at the javadoc for Hashtable. The get method returns an Object. You will need to cast it to a Class object.
Class selected_object = (Class)ht.get( "my_class_name" );If you are using JDK5.0, then you should look up generics.

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.

Help me get my class to add to PriorityQueue

Hi, I have a class called Edge:
class Edge <AnyType extends Comparable<? super AnyType>>
 int node1;
 int node2;
 int weight;
 public Edge(int a, int b, int w)
 node1 = a;
 node2 = b;
 weight = w;
 int getWeight()
 return weight;
 int compareTo(Edge b)
 if (this.weight < b.weight)
 return -1;
 else if (this.weight == b.weight)
 return 0;
 else if (this.weight > b.weight)
 return 1;
 return 0;
}I want to add a LinkedList of Edges to a PriorityQueue using
PriorityQueue<Edge> pq = new PriorityQueue<Edge>( getEdges( ) );The getEdges() method returns a LinkedList of Edges. The error I get is ClassCastException: Edge (in java.util.PriorityQueue).
Any Ideas? Thanks for any help!

Not me :(
I think the problem may be with my class' header:class Edge <AnyType extends Comparable><? super AnyType>>Are you sure that something with that header should be able to be added to a PiorityQueue?

Why can't I use Get LV Class Default Value in a dynamic VI?

I am attempting to override a VI that uses "Get LV Class Default Value" and getting an error that I don't understand. My parent class, "ANT Message Class", has two children - "ANT Command Class" and "ANT Response Class". The children share a lot of data and functionality, including the factory pattern that the parent class' "Load Message Class" VI implements (see image). I would like to override this VI with a Command version and a Response version, which would simply call the Message version with their respective classes overriding the dynamic input and output terminals. However, I am getting the error "Front Panel Terminal 'ANT Message Class Out': Run-time type not propagated from dynamic input to dynamic output."
Not sure how to get around this one. Any ideas?
Thanks,
-Jamie
Solved!
Go to Solution.
Attachments:
Get LV Class Default Value in dynamic VI.png ‏179 KB

The To More Specific node is dealing with compile-type inference. In this case, you are loading a default instance from disk and then attempting to cast to the base Message class. However the type you are casting to is going to a dynamic output - this gives the compiler no assurances that the input class at run-time on the dynamic input will be the same as the output type; only that it will be a type at the top of the hierarchy. Dyanmic dispatch inputs/outputs must be the same type to guarantee some form of type safety.
You need the Preserve node there so that you can guarantee the class at both dynamic dispatch terminals will be the same type.
However this is probably not the best mechanism for a factory method. Factory methods should ideally be static; their job is to provide an instance of the right type (e.g loaded by path as per your example) and you don't need an instance of a class to do that. The only reason I can think of to over-ride said functionailty in a dynamic dispatch method is to provide some form of custom construction for the creation of the type. If all you are creating is an instance with nothing but the default private data then there is no reason to over-ride in the child classes.
EDIT: Another post collision. nathand is on the money with this one.

Class Inside MovieClip Giving Runtime Error

Hey guys.
I'm trying to place an instance of a movieclip (instance
name: tehMovieClip) from the library within another movieclip
(instance name: parentMovieClip) on the stage. tehMovieClip, the
movieclip going inside another movieclip, belongs to a class called
CollisonDetection (linkage properties, class:CollisonDetection,
Base Class: flash.display.MovieClip). When I put tehMovieClip
inside parentMovieClip, I get this runtime error:
TypeError: Error #1009: Cannot access a property or method of
a null object reference.
If I just place tehMovieClip on the stage by itself, it works
fine but I need it to be inside parentMovieClip. So what should I
do?
Just for your information, CollisonDetection extends the
project's DocumentClass which extends MovieClip.
Thanks in advanced!

Thanks for that buddy.
quote:
Originally posted by:
SwapnilVJ
Is the movie clip your are placing linked from library to a
class?
The movieclip in question (the one I am placing inside
another movieclip) is linked to a class.
quote:
Originally posted by:
SwapnilVJ
If yes. Is the Class linked to the movieclip have a
Constructor method with parameters?
Well this is my current constructor:
public function CollisonDetection() {
playerRefFromCollisonDetection.x = 600;
Now that you've said that, I deleted that middle line and it
seemed to work
quote:
Originally posted by:
SwapnilVJ
If Yes. you found the problem.
And solution will be to update the class' constructor to have
no parameters.
Thanks buddy, but what if I need to have statements inside
the constructor such as triggering methods/functions inside the
class?

Error: could not be converted to [class java.lang.Class].

I am newbie to JDeveloper (10.1.2) on winxp and i was trying to setup the example from the following url http://radio.weblogs.com/0129487/2003/09/19.html
It is a how to on "Executing Toplink Queries using JavaBean DataControl "
Any help would be greatly appreciated.
Near the bottom on step "In StrutsPageFlow diagram, select allEmpsDA Data Action, right mouse and chooe Run" i get a the following runtime errors:
Validation Error
You must correct the following error(s) before proceeding:
JBO-29000: Unexpected exception caught: oracle.jbo.JboException, msg=JBO-29000: Unexpected exception caught: oracle.toplink.exceptions.ConversionException, msg= Exception Description: The object [mypackage.Employees], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Please ensure that the class [class java.lang.Class] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager Internal Exception: java.lang.ClassNotFoundException: mypackage.Employees
JBO-29000: Unexpected exception caught: oracle.toplink.exceptions.ConversionException, msg= Exception Description: The object [mypackage.Employees], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Please ensure that the class [class java.lang.Class] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager Internal Exception: java.lang.ClassNotFoundException: mypackage.Employees
Exception Description: The object [mypackage.Employees], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Please ensure that the class [class java.lang.Class] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager Internal Exception: java.lang.ClassNotFoundException: mypackage.Employees

This error is happening on a read.
Here is the mapping descriptor:
<database-mapping>
<attribute-name>SuppItemCollection</attribute-name>
<read-only>false</read-only>
<reference-class>package.SuppItem</reference-class>
<is-private-owned>false</is-private-owned>
<uses-batch-reading>false</uses-batch-reading>
<indirection-policy>
<mapping-indirection-policy>
<type>oracle.toplink.internal.indirection.NoIndirectionPolicy</type>
</mapping-indirection-policy>
</indirection-policy>
<container-policy>
<mapping-container-policy>
<container-class>java.util.Vector</container-class>
<type>oracle.toplink.internal.queryframework.ListContainerPolicy</type>
</mapping-container-policy>
</container-policy>
<source-key-fields>
<field>SUPP.REQ_NUM</field>
</source-key-fields>
<target-foreign-key-fields>
<field>SUPP_ITEM.REQ_NUM</field>
</target-foreign-key-fields>
<type>oracle.toplink.mappings.OneToManyMapping</type>
</database-mapping>
Object model has a Supp class that has a collection of SuppItem(s). I was allowing the Mapping Workbench to create the Java Source. I'm not to fond of that, but I thought it would be easiest to get things going.
The datamodel is similiar to the class model.
Thanks for the help,
Mike

Java Mapping - Class versions are incompatible (linkage error)

Hi Friends,
While testing java mapping in Integration Repository i am getting an error - "Class versions are incompatible (linkage error)". Can anyone plz tell what might be the reason.
Regards,
Gowtham Kuchipudi.

hello
I have this message but my trace look like this:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
- 
- <SAP:Trace xmlns:SAP="http://sap.com/xi/XI/Message/30">
- <Trace level="1" type="B" name="interface activity determination">
<Trace level="1" type="T">Version 000</Trace>
<Trace level="1" type="T">Message status 000</Trace>
<Trace level="1" type="T">Interface action INIT</Trace>
<Trace level="1" type="T">(must be INIT for a new determination)</Trace>
<Trace level="1" type="T">Message type BEST EFFORT. -> No determination</Trace>
<Trace level="1" type="T">Set interface action INIT into *MAST*</Trace>
</Trace>
<Trace level="1" type="E">CL_XMS_MAIN-WRITE_MESSAGE_LOG_TO_PERSIST</Trace>
- <Trace level="1" type="B" name="PLSRV_RECEIVER_DETERMINATION">
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV">
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV_LOCAL">
- <Trace level="1" type="B" name="CL_RD_PLSRV-ENTER_PLSRV">
<Trace level="1" type="T">R E C E I V E R - D E T E R M I N A T I O N</Trace>
<Trace level="1" type="T">Cache Content is up to date</Trace>
</Trace>
</Trace>
</Trace>
</Trace>
<Trace level="1" type="B" name="CL_XMS_MAIN-WRITE_MESSAGE_LOG_TO_PERSIST" />
- <Trace level="1" type="B" name="PLSRV_INTERFACE_DETERMINATION">
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV">
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV_LOCAL">
- <Trace level="1" type="B" name="CL_ID_PLSRV-ENTER_PLSRV">
<Trace level="1" type="T">I N T E R F A C E - D E T E R M I N A T I O N</Trace>
<Trace level="1" type="T">Cache Content is up to date</Trace>
</Trace>
</Trace>
</Trace>
</Trace>
<Trace level="1" type="B" name="CL_XMS_MAIN-WRITE_MESSAGE_LOG_TO_PERSIST" />
- <Trace level="1" type="B" name="PLSRV_RECEIVER_MESSAGE_SPLIT">
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV">
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV_LOCAL">
- <Trace level="1" type="B" name="CL_XMS_PLSRV_RECEIVER_SPLIT-ENTER_PLSRV">
<Trace level="1" type="T">number of receivers: 1</Trace>
<Trace level="1" type="T">Single-receiver split case</Trace>
</Trace>
</Trace>
</Trace>
</Trace>
<Trace level="1" type="B" name="CL_XMS_MAIN-WRITE_MESSAGE_LOG_TO_PERSIST" />
<Trace level="1" type="B" name="PLSRV_MAPPING_REQUEST" />
- 
- <Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV">
<Trace level="1" type="B" name="CL_XMS_MAIN-CALL_PLSRV_LOCAL" />
- 
<Trace level="1" type="B" name="CL_MAPPING_XMS_PLSRV3-ENTER_PLSRV" />
- 
<Trace level="1" type="T">Interface Mapping http://Migdal.co.il/CRM/SAP-CRM/ProposalDeatailsService ProposalDeatailsService_WS2RFC_IM</Trace>
<Trace level="1" type="T">LinkageError at JavaMapping.load(): Could not load class: xmlpayload</Trace>
<Trace level="1" type="T">java.lang.UnsupportedClassVersionError: xmlpayload (Unsupported major.minor version 49.0) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:539) at java.lang.ClassLoader.defineClass(ClassLoader.java:448) at com.sap.aii.ibrun.server.mapping.MappingLoader.findClass(MappingLoader.java:158) at java.lang.ClassLoader.loadClass(ClassLoader.java:289) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at com.sap.aii.ibrun.server.mapping.JavaMapping.load(JavaMapping.java:95) at com.sap.aii.ibrun.server.mapping.JavaMapping.executeStep(JavaMapping.java:45) at com.sap.aii.ibrun.server.mapping.Mapping.execute(Mapping.java:92) at com.sap.aii.ibrun.server.mapping.MappingHandler.run(MappingHandler.java:90) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleMappingRequest(MappingRequestHandler.java:95) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleRequest(MappingRequestHandler.java:68) at com.sap.aii.ibrun.sbeans.mapping.MappingServiceImpl.processFunction(MappingServiceImpl.java:79) at com.sap.aii.ibrun.sbeans.mapping.MappingServiceObjectImpl0_0.processFunction(MappingServiceObjectImpl0_0.java:131) at sun.reflect.GeneratedMethodAccessor296.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.sap.engine.services.ejb.session.stateless_sp5.ObjectStubProxyImpl.invoke(ObjectStubProxyImpl.java:187) at $Proxy158.processFunction(Unknown Source) at sun.reflect.GeneratedMethodAccessor428.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.sap.engine.services.rfcengine.RFCDefaultRequestHandler.handleRequest(RFCDefaultRequestHandler.java:107) at com.sap.engine.services.rfcengine.RFCJCOServer.handleRequestInternal(RFCJCOServer.java:113) at com.sap.engine.services.rfcengine.RFCJCOServer$ApplicationRunnable.run(RFCJCOServer.java:157) at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37) at java.security.AccessController.doPrivileged(Native Method) at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102) at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)</Trace>
<Trace level="1" type="T">Linkage error occurred when loading class xmlpayload (http://Migdal.co.il/CRM/SAP-CRM/ProposalDeatailsService, d7e31f30-53be-11dc-8fbd-ee09c0a8664d, -1)</Trace>
<Trace level="1" type="T">com.sap.aii.ibrun.server.mapping.MappingRuntimeException: Linkage error occurred when loading class xmlpayload (http://Migdal.co.il/CRM/SAP-CRM/ProposalDeatailsService, d7e31f30-53be-11dc-8fbd-ee09c0a8664d, -1) at com.sap.aii.ibrun.server.mapping.JavaMapping.load(JavaMapping.java:115) at com.sap.aii.ibrun.server.mapping.JavaMapping.executeStep(JavaMapping.java:45) at com.sap.aii.ibrun.server.mapping.Mapping.execute(Mapping.java:92) at com.sap.aii.ibrun.server.mapping.MappingHandler.run(MappingHandler.java:90) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleMappingRequest(MappingRequestHandler.java:95) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleRequest(MappingRequestHandler.java:68) at com.sap.aii.ibrun.sbeans.mapping.MappingServiceImpl.processFunction(MappingServiceImpl.java:79) at com.sap.aii.ibrun.sbeans.mapping.MappingServiceObjectImpl0_0.processFunction(MappingServiceObjectImpl0_0.java:131) at sun.reflect.GeneratedMethodAccessor296.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.sap.engine.services.ejb.session.stateless_sp5.ObjectStubProxyImpl.invoke(ObjectStubProxyImpl.java:187) at $Proxy158.processFunction(Unknown Source) at sun.reflect.GeneratedMethodAccessor428.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.sap.engine.services.rfcengine.RFCDefaultRequestHandler.handleRequest(RFCDefaultRequestHandler.java:107) at com.sap.engine.services.rfcengine.RFCJCOServer.handleRequestInternal(RFCJCOServer.java:113) at com.sap.engine.services.rfcengine.RFCJCOServer$ApplicationRunnable.run(RFCJCOServer.java:157) at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37) at java.security.AccessController.doPrivileged(Native Method) at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102) at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172) Root Cause: java.lang.UnsupportedClassVersionError: xmlpayload (Unsupported major.minor version 49.0) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:539) at java.lang.ClassLoader.defineClass(ClassLoader.java:448) at com.sap.aii.ibrun.server.mapping.MappingLoader.findClass(MappingLoader.java:158) at java.lang.ClassLoader.loadClass(ClassLoader.java:289) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at com.sap.aii.ibrun.server.mapping.JavaMapping.load(JavaMapping.java:95) at com.sap.aii.ibrun.server.mapping.JavaMapping.executeStep(JavaMapping.java:45) at com.sap.aii.ibrun.server.mapping.Mapping.execute(Mapping.java:92) at com.sap.aii.ibrun.server.mapping.MappingHandler.run(MappingHandler.java:90) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleMappingRequest(MappingRequestHandler.java:95) at com.sap.aii.ibrun.sbeans.mapping.MappingRequestHandler.handleRequest(MappingRequestHandler.java:68) at com.sap.aii.ibrun.sbeans.mapping.MappingServiceImpl.processFunction(MappingServiceImpl.java:79) at com.sap.aii.ibrun.sbeans.mapping.MappingServiceObjectImpl0_0.processFunction(MappingServiceObjectImpl0_0.java:131) at sun.reflect.GeneratedMethodAccessor296.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.sap.engine.services.ejb.session.stateless_sp5.ObjectStubProxyImpl.invoke(ObjectStubProxyImpl.java:187) at $Proxy158.processFunction(Unknown Source) at sun.reflect.GeneratedMethodAccessor428.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.sap.engine.services.rfcengine.RFCDefaultRequestHandler.handleRequest(RFCDefaultRequestHandler.java:107) at com.sap.engine.services.rfcengine.RFCJCOServer.handleRequestInternal(RFCJCOServer.java:113) at com.sap.engine.services.rfcengine.RFCJCOServer$ApplicationRunnable.run(RFCJCOServer.java:157) at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37) at java.security.AccessController.doPrivileged(Native Method) at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102) at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)</Trace>
<Trace level="1" type="E">CL_XMS_PLSRV_MAPPING~ENTER_PLSRV</Trace>
</Trace>
<Trace level="1" type="B" name="CL_XMS_MAIN-WRITE_MESSAGE_TO_PERSIST" />
- 
</SAP:Trace>
the error that I recieve in the SXMB is:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
- 
- <SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">
<SAP:Category>Application</SAP:Category>
<SAP:Code area="MAPPING">LINKAGE_ERROR</SAP:Code>
<SAP:P1>xmlpayload</SAP:P1>
<SAP:P2>http://Migdal.co.il/CRM/SAP-CRM/ProposalDeatailsS~</SAP:P2>
<SAP:P3>d7e31f30-53be-11dc-8fbd-ee09c0a8664d</SAP:P3>
<SAP:P4>-1</SAP:P4>
<SAP:AdditionalText />
<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack>Class versions are incompatible (linkage error)</SAP:Stack>
<SAP:Retry>N</SAP:Retry>
</SAP:Error>
this is my XI information
Runtime Environment
Java version:1.4.2_12
Java vendor:Sun Microsystems Inc.
Version
Service pack:21
Release:30_VAL_REL
Latest change:409678
Sync time:200709211024
since I already have the SP required by the note, any other suggestions?
Thanks
Kfir

Extended a class, getting a class cast error

Similar Messages

Maybe you are looking for