Re: [Ikvm-developers] NoClassDefFoundError occurred

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Hi,

You should contact the autor of the binary. I does not know the internal of this library. I am suspect to the JNI facts.
There should be also a second dll with the JNI part.

I think AppDomainAssemblyClassLoader is a good idea.

Volker

> -----Ursprungliche Nachricht-----
> Von: Frank Bergmann [mailto:fbergman@u.washington.edu] 
> Gesendet: Dienstag, 3. November 2009 22:30
> An: ikv...@li...
> Betreff: Re: [Ikvm-developers] NoClassDefFoundError occurred
> 
> I'm currently using ikvm: 0.38.0.4, but I could upgrade to: 
> 0.40.0.1 if you
> think that would make a difference. 
> 
> As for the class loaders I'm actually not sure. As said 
> before I was just
> reusing the from trolltech compiled qtjambi binaries. At 
> first glance I
> cannot find out whether they use custom classloaders in their 
> code. Also
> since I was using the binaries from the qt4dotnet I'm not 
> sure whether any
> classloader was specified through the command line. 
> 
> But I'd be fine with regenerating the library ... so if you 
> tell me which
> one to use that would be great. Since 1) I have a single jar 
> file which was
> translated into a single library, 2) I don't write any java 
> code, I should
> compile the library with:
> -classloader:ikvm.runtime.AppDomainAssemblyClassLoader?
> 
> Thanks
> Frank
> 
> > -----Original Message-----
> > From: Volker Berlin [mailto:vol...@go...]
> > Sent: Tuesday, November 03, 2009 12:23 PM
> > To: 'Frank Bergmann'; ikv...@li...
> > Subject: AW: [Ikvm-developers] NoClassDefFoundError occurred
> > 
> > Hi,
> > 
> > First the general questions:
> > Which IKVM version do you use?
> > Which classloader do you use? See also the wiki at
> > 
> http://sourceforge.net/apps/mediawiki/ikvm/index.php?title=ClassLoader
> > 
> > Volker
> > 
> > 
> > > -----Ursprungliche Nachricht-----
> > > Von: Frank Bergmann [mailto:fbergman@u.washington.edu]
> > > Gesendet: Dienstag, 3. November 2009 20:14
> > > An: ikv...@li...
> > > Betreff: [Ikvm-developers] NoClassDefFoundError occurred
> > >
> > > Hello,
> > >
> > > First of all let me say how much I appreciate all the hard
> > > work you do with
> > > ikvm it is simply amazing and has changed the way we will 
> deploy our
> > > software from now on. However, I am facing problems and it
> > > would be great if
> > > you could help me out.
> > >
> > > I'm using ikvmc generated assemblies that allow me to access
> > > the qtjambi
> > > framework:
> > >
> > > http://code.google.com/p/qt4dotnet/
> > >
> > > and mostly things work just fine, at least as long as I
> > > confine myself to
> > > never use .Net objects in a class used by qtjambi. However
> > > for my current
> > > project I'm stumped. I need to define my own object inherited from
> > > QGraphicsScene, which works great up to the point where
> > > qtjambi is using it
> > > (here in a custom QGraphicsItem::itemChange method). So I was
> > > hoping you
> > > could tell me what I could do to make it work. I think I saw
> > > on the IKVM
> > > website that it should be possible to refer to CLI objects.
> > > Here the error I
> > > get:
> > >
> > >
> > > public class MyItem: QGraphicsItemGroup
> > > {
> > > public override object
> > > itemChange(QGraphicsItem.GraphicsItemChange change,
> > > object value)
> > >         {
> > >             if (change ==
> > > QGraphicsItem.GraphicsItemChange.ItemPositionChange)
> > >             {
> > >                 UpdateTheItem();
> > >
> > >                 return value;
> > >             }
> > >
> > >             return base.itemChange(change, value); //<---- BOOOOM
> > >         }
> > >
> > > ....
> > > }
> > >
> > > The Exception:
> > >
> > > Java.lang.NoClassDefFoundError {"cli/MyGraphicsScene"}
> > >
> > >    at IKVM.Runtime.JNI.Frame.Leave()
> > >    at
> > > com.trolltech.qt.gui.QGraphicsItemGroup.__qt_itemChange_Graphi
> > > csItemChange_O
> > > bject(Int64 , Int32 , Object )
> > >    at
> > > 
> com.trolltech.qt.gui.QGraphicsItemGroup.itemChange(GraphicsItemChange
> > > change, Object value)
> > >    at
> > > 
> BenZaiTenQt.GraphicItems.QSpeciesItem.itemChange(GraphicsItemChange
> > > change, Object value) in MyItem.cs:line 167
> > >
> > >
> > > and here the definition of the scene:
> > >
> > > public class MyGraphicsScene : QGraphicsScene
> > >     {
> > >
> > >
> > >         public MyGraphicsScene(QObject parent)
> > >             : base(parent)
> > >         {
> > >             Initialize();
> > >         }
> > >         public MyGraphicsScene(QRectF sceneRect, QObject parent)
> > >             : base(sceneRect, parent)
> > >         {
> > >             Initialize();
> > >         }
> > >         public MyGraphicsScene(double x, double y, double
> > > width, double
> > > height, QObject parent)
> > >             : base(x, y, width, height, parent)
> > >         {
> > >             Initialize();
> > >         }
> > >         public MyGraphicsScene(QRectF sceneRect)
> > >             : base(sceneRect)
> > >         {
> > >             Initialize();
> > >         }
> > >         public MyGraphicsScene(double x, double y, double
> > > width, double
> > > height)
> > >             : base(x, y, width, height)
> > >         {
> > >             Initialize();
> > >         }
> > >         protected internal
> > > MyGraphicsScene(QtJambiObject.QPrivateConstructor
> > > p)
> > >             : base(p)
> > >         {
> > >             Initialize();
> > >         }
> > >
> > >         private void Initialize()
> > >         {
> > >
> > >         }
> > >
> > >     }
> > >
> > > Also things like the following seem to fail, I wonder why:
> > >
> > > public class MyVeryImportantClass { public
> > > MyVeryImportantClass () {} }
> > >
> > > public class MyDialog : QDialog { public
> > > MyDialog(MyVeryImportantClass var1)
> > > { _var1 = var1; }
> > > 		public MyVeryImportantClass Helper { get {
> > > return _var1; }
> > > set { _var1 = value;} } }
> > >
> > > where a CLI class is referenced will just fail with a
> > > NullReferenceException:
> > >
> > > *** exception in native code ***
> > > System.NullReferenceException: Object reference not set to an
> > > instance of an
> > > object.
> > >    at __<Getter>(Object )
> > >    at
> > > IKVM.NativeCode.sun.reflect.ReflectionFactory.FieldAccessorImp
> > > lBase.FastObje
> > > ctFieldAccessor.get(Object obj)
> > >    at IKVM.Runtime.JNIEnv.GetObjectField(JNIEnv* pEnv, IntPtr
> > > obj, IntPtr
> > > fieldID)
> > >    at
> > > 
> com.trolltech.qt.gui.QDialog.__qt_QDialog_QWidget_WindowFlags(Int64 ,
> > > Int32 )
> > > *** exception in native code ***
> > > System.NullReferenceException: Object reference not set to an
> > > instance of an
> > > object.
> > >    at __<Getter>(Object )
> > >    at
> > > IKVM.NativeCode.sun.reflect.ReflectionFactory.FieldAccessorImp
> > > lBase.FastObje
> > > ctFieldAccessor.get(Object obj)
> > >    at IKVM.Runtime.JNIEnv.GetObjectField(JNIEnv* pEnv, IntPtr
> > > obj, IntPtr
> > > fieldID)
> > >    at com.trolltech.qt.core.QObject.__qt_toString(Int64 )
> > >
> > >
> > > Thank you so much
> > > Best
> > > frank
> > >
> > >
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> > > Ikv...@li...
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> > >
> 
> 
> 
> --------------------------------------------------------------
> ----------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. 
> Jumpstart your
> developing skills, take BlackBerry mobile applications to 
> market and stay 
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
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