[vtkusers] Compilation problem with java

David D. Marshall gte552m at prism.gatech.edu
Tue Jun 13 09:37:33 EDT 2000 

But a fresh install has no java classes compiled :(.  Once you have the compiled classes then you can
use the Makefile and javac will find them using the CLASSPATH environment variable, but its the
chicken and egg thing, the Makefile cannot compile vtkActor2D because it can't find vtkProp (not
compiled yet), but it can't compile vtkProp because the Makefile failed on vtkActor2D.  The reason
that this doesn't receive more attention is probably that once you have the classes compiled, you'll
never hit this problem again.

I agree that compiling them by hand is a pain in the ass, but if you tell it to compile
{vtk_home}/java/vtk/*.java once all of the java sources have been generated, it will compile all of
the java sources and javac will resolve the dependencies between all of the source files passed and
any compiled classes in the CLASSPATH.

"Daniel J. Blezek, Ph.D." wrote:

> David,
>
>   Actually, you do not have to manually compile anything!  javac, unlike
> CC resolves dependancies by itself, IF javac knows where you have already
> compiled the classes.  Setting CLASSPATH or adding a -classpath flag to
> javac tells javac how to resolve dependancies.
>
>   If you try to compile things by hand as they crop up as errors, you'll
> be at it a _long_ time (I know, I've tried).
>
> -dan
>
> On Tue, 13 Jun 2000, David D. Marshall wrote:
>
> > I don't think this is the problem.  The problem is that the java classes are not compiled in the
> > correct order.  The vtkProp.java file has not been compiled yet the Makefile is trying to
> > compile the vtkActor2D class which inherits from vtkProp.  So until the Makefiles are fixed to
> > compile in the correct order, a new person has to manually compile the classes by hand.  What
> > worked for me was: javac -d {class_path} {vtk_home}/java/vtk/*.java.  Once you have the java
> > classes compiled in the {class_path} directory, then you can use the Makefiles.
> >
> > Slightly off topic but equally annoying is the fact the there are no dependencies in the
> > Makefiles for the java compilation, so everytime you need to make the java libraries it will
> > re-make all of the the java classes.  But since I'm not doing anything about it, I guess I
> > should just shut up :).
> >
> > Hope this helps.
> >
> > "Daniel J. Blezek, Ph.D." wrote:
> >
> > > Hi all,
> > >
> > >   This should be a FAQ...
> > >
> > >   javac will do the right thing if you tell it where to look for already
> > > compiled classes.  The easiest way (and a bit of a hack) is to make your
> > > user.make have a line like this:
> > >
> > > JAVA_CLASS_HOME= <path to java classes> -classpath <path to java classes>
> > >
> > > This tells javac to look in the same place for already compiled classes.
> > > In the same way you can set the CLASSPATH environment variable to include
> > > the place where you are putting the compiled classes:
> > > (/scratch0/NOT_BACKED_UP/ucacdxa/TCLTk/VTKJavaClasses in the example
> > > below).
> > >
> > > -dan
> > >
> > > On Tue, 13 Jun 2000, Suman Datta wrote:
> > >
> > > > hi all,
> > > >       my problem is exactly the same ... not able to
> > > > compile vtk on solaris ... somebody please advise how
> > > > to solve this problem ...
> > > >
> > > > regards,
> > > > suman datta.
> > > >
> > > >
> > > > --- Olivier Coulon <o.coulon at cs.ucl.ac.uk> wrote:
> > > > > Dear vtk users,
> > > > >
> > > > > I'm trying to compile vtk3.1 on Solaris2.7 using the
> > > > > --with-java option
> > > > > and I get an error as soon as the compilation of the
> > > > > java classes
> > > > > starts.  it seems that the compiler cannot find the
> > > > > vtkProp class while
> > > > > compiling vtkActor2D, which is weird because the two
> > > > > files are in the
> > > > > same directory.
> > > > > Somebody has an idea what goes wrong ?
> > > > >
> > > > > - Olivier
> > > > >
> > > > >
> > > > > Here is the messages I get:
> > > > >
> > > > > rm -f ../java/vtk/vtkObjectFactoryCollection.java;
> > > > >
> > > > /scratch0/NOT_BACKED_UP/ucacdxa/TCLTk/vtk31/wrap/vtkParseJava
> > > > > ../vtkObjectFactoryCollection.h ./../wrap/hints 1 >
> > > > > .../java/vtk/vtkObjectFactoryCollection.java
> > > > >    Parsed func New
> > > > >    Parsed func AddItem
> > > > >    Parsed func GetNextItem
> > > > >    Parsed func vtkObjectFactoryCollection
> > > > >    Parsed func vtkObjectFactoryCollection
> > > > >    Parsed func vtkObjectFactoryCollection
> > > > >    Converted operator
> > > > >    Parsed func AddItem
> > > > > /opt/ucl/bin/javac -sourcepath
> > > > > /scratch0/NOT_BACKED_UP/ucacdxa/TCLTk/vtk31/java/vtk
> > > > > -d
> > > > > /scratch0/NOT_BACKED_UP/ucacdxa/TCLTk/VTKJavaClasses
> > > > > .../java/vtk/vtkActor2D.java
> > > > > .../java/vtk/vtkActor2D.java:7: Superclass
> > > > > vtk.vtkProp of class
> > > > > vtk.vtkActor2D not found.
> > > > > public class vtkActor2D extends vtkProp
> > > > >                                 ^
> > > > > 1 error
> > > > > make[1]: *** [../java/vtk/vtkActor2D.class] Error 1
> > > > > make[1]: Leaving directory
> > > > > `/scratch0/NOT_BACKED_UP/ucacdxa/TCLTk/vtk31/common'
> > > > > make: *** [build_common] Error 2
> > > > >
> > > > >
> > > > > > begin:vcard
> > > > > n:Coulon;Olivier
> > > > > tel;fax:+44 (0)20 7387 1387
> > > > > tel;work:+44 (0)20 7679 3702
> > > > > x-mozilla-html:TRUE
> > > > > url:http://www.cs.ucl.ac.uk/staff/O.Coulon
> > > > > org:University College London;Computer Sciences
> > > > > adr:;;Gower Street;London;;WC1E 6BT;United-Kingdom
> > > > > version:2.1
> > > > > email;internet:O.Coulon at cs.ucl.ac.uk
> > > > > title:PhD
> > > > > x-mozilla-cpt:;27200
> > > > > fn:Olivier Coulon
> > > > > end:vcard
> > > > >
> > > >
> > > >
> > > > __________________________________________________
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> > > >
> > > > _______________________________________________
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> > > >
> > >
> > > --
> > > Daniel Blezek, Ph.D.
> > > blezek at crd.ge.com
> > > Computer Graphics and Systems Program
> > > Electronic Systems Lab
> > > GE Corporate Research & Development
> > >
> > > _______________________________________________
> > > This is the private VTK discussion list.
> > > Please keep messages on-topic. Check the FAQ at: <http://public.kitware.com/cgi-bin/vtkfaq>
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> >
> > --
> > David D. Marshall
> > ARTLab System Administrator/GRA
> > Georgia Institute of Technology, Atlanta Georgia, 30332
> > http://www.ae.gatech.edu/research/artlab/artl/artlab.html
> > mailto:gte552m at prism.gatech.edu
> > think: Why anonymity is good http://www.cato.org/pubs/briefs/bp-054es.html
> >
> >
>
> --
> Daniel Blezek, Ph.D.
> blezek at crd.ge.com
> Computer Graphics and Systems Program
> Electronic Systems Lab
> GE Corporate Research & Development
>
> _______________________________________________
> This is the private VTK discussion list.
> Please keep messages on-topic. Check the FAQ at: <http://public.kitware.com/cgi-bin/vtkfaq>
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--
David D. Marshall
ARTLab System Administrator/GRA
Georgia Institute of Technology, Atlanta Georgia, 30332
http://www.ae.gatech.edu/research/artlab/artl/artlab.html
mailto:gte552m at prism.gatech.edu
think: Why anonymity is good http://www.cato.org/pubs/briefs/bp-054es.html

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