Jython

Hello list,

We have just recently begun a large project using Java and Jython, and I
have found some serious shortcomings in the jythonc compiler.  The first
is the inability to allow jythonc to automatically package compiled code
based on the directory structure and relative location of the .py files
that it compiles.  Really, it is merely an inconvenience, but it is a
feature that I had expected to find.

More seriously, jythonc seems to be incapable of solving circular
references between Python and Java code.  All that I really need to fix
that is the ability to tell jythonc to not compile the .java files that
it creates, and I will let javac resolve the circular references.

I thought that perhaps someone on this list had already come up with
solutions to these problems.  If not, however, I suppose that I will
dive into the compiler myself and try to add these two features.  It
would be very helpful if someone with more knowledge of jythonc than I
have could direct me to the places in the code where I can easily
disable Java compilation and modify the packages of created Java files.

Thanks a lot in advance,
Kevin Nardi

At 13:29 06.11.2003 -0800, Kevin Nardi wrote:
>More seriously, jythonc seems to be incapable of solving circular
>references between Python and Java code.  All that I really need to fix
>that is the ability to tell jythonc to not compile the .java files that
>it creates, and I will let javac resolve the circular references.

-C NONE

does just that (you need to specify --deep if you also specify -p package)

But you should consider that jythonc will produce code for a Java proxy for 
B in

import A # A is implemented in A.java

class B(A)
  pass

only if A.class exists, A.java around is not enough.

regards.

So, basically, this will not fix my problem:

// ClassA.java

public class ClassA {
	public ClassB b = ClassB(this);
}

# ClassB.py

import ClassA

class ClassB(ClassA):
	def __init__(self, a):
		"""@sig ClassB(ClassA a)"""
		self.a = a

You are telling me that I have to compile ClassA.java first, but javac
won't do it without ClassB.class or at least ClassB.java.  What options
do I have then?  Any clues?  Up until now I have been commenting out all
references to the Jython classes in my Java classes in order to compile
them, and then compiling Jython secondly before reinserting the Jython
references in my Java code and recompiling.

This does not seem to be a good solution.

I am sure someone else has come upon this problem before me.  Any ideas?

-Kevin


-----Original Message-----
From: jython-users-admin@...
[mailto:jython-users-admin@...] On Behalf Of Samuele
Pedroni
Sent: Thursday, November 06, 2003 2:26 PM
To: Kevin Nardi; jython-users@...
Subject: Re: [Jython-users] jythonc

At 13:29 06.11.2003 -0800, Kevin Nardi wrote:
>More seriously, jythonc seems to be incapable of solving circular
>references between Python and Java code.  All that I really need to fix
>that is the ability to tell jythonc to not compile the .java files that
>it creates, and I will let javac resolve the circular references.

-C NONE

does just that (you need to specify --deep if you also specify -p
package)

But you should consider that jythonc will produce code for a Java proxy
for 
B in

import A # A is implemented in A.java

class B(A)
  pass

only if A.class exists, A.java around is not enough.

regards.







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I have this problem:

# A.py

import B

class A:
	b = B()

# B.py

class B:
	pass

When I try to compile (using the JythonCAntTask), I get this error:

	Creating .java files:
	  File "c:\jython-2.1\Tools\jythonc\main.py", line 301, in main
	  File "c:\jython-2.1\Tools\jythonc\main.py", line 221, in
doCompile
	  A module
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 389, in
dump
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 325, in
	preprocessModule
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 312, in
	makeJavaProxy
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 58, in
getsig
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 84, in
	insistJavaClass
	ValueError: can not find class: B

I've tried various compiler options, but I haven't been lucky enough to
find a solution that works.

Is Jythonc unable to recognize that it needs to compile B.py first?

I could manually compile B before A, but this is not a feasible solution
for anything much larger than this simple example.

Thanks for the help!

-Kevin

Kevin Nardi wrote:
> import B
> 
> class A:
> 	b = B()

This must be
	b = B.B()
B is the module 'B.py', B.B is the class 'B' inside module 'B.py'


- Willem

At 05:12 09.11.2003 -0800, Kevin Nardi wrote:
>I have this problem:
>
># A.py
>
>import B
>
>class A:
>         b = B()
>
># B.py
>
>class B:
>         pass
>
>When I try to compile (using the JythonCAntTask), I get this error:
>
>         Creating .java files:
>           File "c:\jython-2.1\Tools\jythonc\main.py", line 301, in main
>           File "c:\jython-2.1\Tools\jythonc\main.py", line 221, in
>doCompile
>           A module
>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 389, in
>dump
>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 325, in
>         preprocessModule
>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 312, in
>         makeJavaProxy
>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 58, in
>getsig
>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 84, in
>         insistJavaClass
>         ValueError: can not find class: B
>
>I've tried various compiler options, but I haven't been lucky enough to
>find a solution that works.

funny because A.py+B.py will never produce that traceback, it's more likely 
for something
like:

import java

class A(java.lang.Object):

    def meth(x):
      "@sig public void meth(B x)"
      pass

regards.

>>I have this problem:
>>
>># A.py
>>
>>import B
>>
>>class A:
>>         b = B()
>>
>># B.py
>>
>>class B:
>>         pass
>>
>>When I try to compile (using the JythonCAntTask), I get this error:
>>
>>         Creating .java files:
>>           File "c:\jython-2.1\Tools\jythonc\main.py", line 301, in
main
>>           File "c:\jython-2.1\Tools\jythonc\main.py", line 221, in
>>doCompile
>>           A module
>>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 389, in
>>dump
>>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 325, in
>>         preprocessModule
>>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 312, in
>>         makeJavaProxy
>>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 58, in
>>getsig
>>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 84, in
>>         insistJavaClass
>>         ValueError: can not find class: B
>>
>>I've tried various compiler options, but I haven't been lucky enough
to
>>find a solution that works.
>
>funny because A.py+B.py will never produce that traceback, it's more
likely 
>for something
>like:
>
>import java
>
>class A(java.lang.Object):
>
>    def meth(x):
>      "@sig public void meth(B x)"
>      pass
>
>regards.

I'm sorry, I was too hasty with my example.  I got off my lazy butt and
actually compiled my example this time.  You were right, and this is the
correct problem:

	# A.py
	
	import B
	
	class A:
		def setB(self, b):
			"""@sig public void setB(B b)"""
			self.b = b
	
	# B.py
	
	class B:
	         pass

Which produces this output:

	processing A
	processing B
	Required packages:
	Creating adapters:
	Creating .java files:
	  A module
	Traceback (innermost last):
	  File "c:\jython-2.1\Tools\jythonc\jythonc.py", line 5, in ?
	  File "c:\jython-2.1\Tools\jythonc\main.py", line 301, in main
	  File "c:\jython-2.1\Tools\jythonc\main.py", line 221, in
doCompile
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 389, in
dump
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 325, in
preprocessModule
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 312, in
makeJavaProxy
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 58, in
getsig
	  File "c:\jython-2.1\Tools\jythonc\compile.py", line 84, in
insistJavaClass
	ValueError: can not find class: B

Any clues?

Thanks.

-Kevin Nardi

At 16:37 09.11.2003 -0800, Kevin Nardi wrote:

>I'm sorry, I was too hasty with my example.  I got off my lazy butt and
>actually compiled my example this time.

well, submitting bogus reports with their potential time wastage for 
people, is never a good idea


>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 84, in
>insistJavaClass
>         ValueError: can not find class: B
>
>Any clues?

here's a one-time deal,
you submit a bug report on SF

http://sourceforge.net/tracker/?atid=112867&group_id=12867&func=browse

I attach an experimental not-much-tested patch,

you test it.

regards.

Alright, done.  

I am sorry for my ineptitude.  I did not realize that this was a bug
exactly, I thought I was just doing something incorrectly.


Thank you very much for the help.

-Kevin Nardi


-----Original Message-----
From: jython-users-admin@...
[mailto:jython-users-admin@...] On Behalf Of Samuele
Pedroni
Sent: Monday, November 10, 2003 11:51 AM
To: Kevin Nardi; jython-users@...
Subject: RE: [Jython-users] jythonc

At 16:37 09.11.2003 -0800, Kevin Nardi wrote:

>I'm sorry, I was too hasty with my example.  I got off my lazy butt and
>actually compiled my example this time.

well, submitting bogus reports with their potential time wastage for 
people, is never a good idea


>           File "c:\jython-2.1\Tools\jythonc\compile.py", line 84, in
>insistJavaClass
>         ValueError: can not find class: B
>
>Any clues?

here's a one-time deal,
you submit a bug report on SF

http://sourceforge.net/tracker/?atid=112867&group_id=12867&func=browse

I attach an experimental not-much-tested patch,

you test it.

regards. 



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At 17:23 10.11.2003 -0800, Kevin Nardi wrote:
>Alright, done.
>
>I am sorry for my ineptitude.  I did not realize that this was a bug
>exactly, I thought I was just doing something incorrectly.
>
>
>Thank you very much for the help.

I have attached a quick patch to try to the bug report.

http://sourceforge.net/tracker/index.php?func=detail&aid=839683&group_id=12867&atid=112867