jython-users

[Jython-users] Automatic type coercion for python dictionaries?

[Waclawczyk J. <Jan...@ic...>]

Hello,

I try to call in my jython script a java method, which expects Hashtable as argument. But it fails:

	Jython 2.0 on java1.1.8 (JIT: )
	>>> import Test1 # it is my java test class
	>>> Test1.testPyToJavaHash({"key":"value"})
	TypeError: testPyToJavaHash(): 1st arg can't be coerced to java.util.Hashtable

Why is it not possible? (due to primitive types ? )
It would be a nice feature ! (e.g. int -> Integer, ...)

Regards,
Janusz Waclawczyk	

Re: [Jython-users] Automatic type coercion for python dictionaries?

[D-Man <ds...@ri...>]

On Tue, Jun 05, 2001 at 03:29:08PM +0200, Waclawczyk Janusch wrote:
| Hello,
| 
| I try to call in my jython script a java method, which expects
| Hashtable as argument. But it fails:
| 
| 	Jython 2.0 on java1.1.8 (JIT: )
| 	>>> import Test1 # it is my java test class
| 	>>> Test1.testPyToJavaHash({"key":"value"})
| 	TypeError: testPyToJavaHash(): 1st arg can't be coerced to java.util.Hashtable
| 
| Why is it not possible? (due to primitive types ? )
| It would be a nice feature ! (e.g. int -> Integer, ...)

There is a lot of automatic type coercion done by Jython.  See the
section "Calling Java Methods and Functions" at
http://jython.sourceforge.net/docs/usejava.html.  I don't think jython
does any Java<->Java coercion but it does Python<->Java coercion.

I haven't tried passing Python dictionaries or lists to a Java method
that wants an instance of a Java class yet.

-D