[Ikvm-developers] [solved] RE: NoClassDefFoundError occurred

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I just wanted to follow up on this one. I of course meant there was only one
jar file which was converted into one managed library, of course there are
many native libraries to go along with that one. Anyway ... I regenerated
the managed library using the -classloader argument and everything works
great now. 

Thank you again for your help,

Cheers
Frank

> -----Original Message-----
> From: Volker Berlin [mailto:vol...@go...]
> Sent: Tuesday, November 03, 2009 2:19 PM
> To: 'Frank Bergmann'; ikv...@li...
> Subject: AW: [Ikvm-developers] NoClassDefFoundError occurred
> 
> 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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> > > >
> >
> >
> >
> > --------------------------------------------------------------
> > ----------------
> > 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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