Re: [Jython-users] newbee - howto specify path to java classes

[Helmut Jarausch <jarausch@sk...>]

On 21 Jul, Tobias Ivarsson wrote:
> In order to be able to load the jar the JVM has to be able to find it. Jars
> are located using the classpath configuration variable, you can specify your
> classpath when you start java like this:
> java -classpath
> /usr/share/hsqldb/lib/something.jar:/usr/share/hsqldb/lib/another.jar
> org.pyton.util.jython
> 
> I don't know how the jdbc service registration system works but it might be
> possible to do it all in pure python code in jython as well:
> import sys
> sys.path.append('/usr/share/hsqldb/lib/something.jar')
> import org.hsqldb.jdbcDriver


Unfortunately this didn't work, but it put me on the right track.

This works:
CLASSPATH=/usr/share/hsqldb/lib/hsqldb.jar:/usr/share/hsqldb/lib/hsqldbjdbc.jar /usr/local/jython2.5a1/jython

Many thanks,
Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

Re: [Jython-users] Discover java classpath

[Tobias Ivarsson <thobes@gm...>]

The same way as in a regular Java program:
from java.lang import System
System.getProperty('java.class.path')

/Tobias

On Mon, Jul 21, 2008 at 5:41 PM, Allan Davis <alley@...>
wrote:

> Is there any way to what was the java classpath that the jython script is
> running under?
>
> Thanks,
> Alley
>
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>

[Jython-users] Fwd: newbee - howto specify path to java classes

[Tobias Ivarsson <thobes@gm...>]

And this list does not specify a reply-to header... so here is my response
to Helmut for public knowledge.

---------- Forwarded message ----------
From: Tobias Ivarsson <thobes@...>
Date: Mon, Jul 21, 2008 at 5:54 PM
Subject: Re: [Jython-users] newbee - howto specify path to java classes
To: Helmut Jarausch <jarausch@...>


In order to be able to load the jar the JVM has to be able to find it. Jars
are located using the classpath configuration variable, you can specify your
classpath when you start java like this:
java -classpath
/usr/share/hsqldb/lib/something.jar:/usr/share/hsqldb/lib/another.jar
org.pyton.util.jython

I don't know how the jdbc service registration system works but it might be
possible to do it all in pure python code in jython as well:
import sys
sys.path.append('/usr/share/hsqldb/lib/something.jar')
import org.hsqldb.jdbcDriver
from java.sql import DriverManager
con = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost";, "sa", "")

There are a few options for embedding Java in CPython:
 * JPype, uses JNI to access the Java reflection api from Python and adds
some layer of Python code on top of it to make Java objects feel more like
Python objects.
 * JCC, generates C-code for a CPython extension that provides access to a
specified set of Java classes through JNI. Used by the PyLucene project.

I have used JPype quite sucessfully. JCC gets better performance, but is
much harder to work with.
Neither JPype nor JCC have good support for sharing one Java process in
between several CPython processes, making Jython the best option for
concurrent applications.

/Tobias


On Mon, Jul 21, 2008 at 5:31 PM, Helmut Jarausch <jarausch@...> wrote:

> Hi,
>
> being a complete newbee I wonder how I can
> tell jython to load e.g.
> /usr/share/hsqldb/lib/*.jar
>
> I'm trying to run the hsqldb
> by
>
> import java
> from java.sql import *
> from java.io  import *
>
> # but the following statement fails
> java.lang.Class.forName("org.hsqldb.jdbcDriver")
>
> con = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost";, "sa", "")
>
> Many thanks for a hint!
>
> If there is a possibility to use hsqldb from CPython I would
> prefer that very much.
>
> Helmut.
>
> --
> Helmut Jarausch
>
> Lehrstuhl fuer Numerische Mathematik
> RWTH - Aachen University
> D 52056 Aachen, Germany
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Jython-users mailing list
> Jython-users@...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>

[Jython-users] Discover java classpath

[Allan Davis <alley@dr...>]

Is there any way to what was the java classpath that the jython script is
running under?

Thanks,
Alley

[Jython-users] newbee - howto specify path to java classes

[Helmut Jarausch <jarausch@sk...>]

Hi,

being a complete newbee I wonder how I can
tell jython to load e.g.
/usr/share/hsqldb/lib/*.jar

I'm trying to run the hsqldb
by

import java
from java.sql import *
from java.io  import *

# but the following statement fails
java.lang.Class.forName("org.hsqldb.jdbcDriver")

con = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost";, "sa", "")

Many thanks for a hint!

If there is a possibility to use hsqldb from CPython I would
prefer that very much.

Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

Re: [Jython-users] [Jython-dev] Jython help ?

[Baroudi Malek <baroudi.malek@gm...>]

Hello,

Thank you Tobias and I applogize for posting my mail to the dev mailing
list.

Regards M Baroudi.




2008/7/21 Tobias Ivarsson <thobes@...>:

> Hi,
>
> This type of question should really be directed to jython-users, jython-dev
> is for discussion regarding development of Jython. I am cc'ing the
> jython-users list.
>
> jythonc is heavily deprecated. It is no longer a supported but still
> available as is. Another tool with similar functionality might be made
> available in the future, but the exact details have not been mapped out yet.
>
> The preferred way of including python code in your Java application using
> Jython is to embed Jython using org.python.core.PythonInterpreter in your
> Java application.
>
> Something like this:
>
> PythonInterpreter python = ...
> python.exec("import mylibrary");
> python.exec("entry_object = mylibrary.EntryClass()");
> PyObject entryObject = python.get("entry_object");
>
> /Tobias
>
> On Mon, Jul 21, 2008 at 12:22 PM, Baroudi Malek <baroudi.malek@...>
> wrote:
>
>> Hello Jython Dev list,
>>
>> I'm newbie in jython and I would to know if I can I use some python GIS
>> library in my java project with Jython ?
>>
>> My problem is how to use some ".py" file in my java application,I tried
>> jythonc --core --deep --jar appletdemo.jar *.py
>> in console but I have this error :
>>
>> ./jpywork/socket.java:737: as of release 1.4, 'assert' is a keyword, and
>> may not be used as an identifier
>> (use -source 1.3 or lower to use 'assert' as an identifier)
>>             if (frame.getglobal("__debug__").__nonzero__())
>> Py.assert(frame.getlocal(0).__getattr__("sock"));
>>                                                                ^
>>
>> my python library is here :
>> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Formats/KML.py
>>
>> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Formats/OSM.py
>>
>> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Formats/WFS.py
>>
>> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Feature.py
>>
>>
>> Thank you in advance.
>>
>> -------------------------------------------------------------------------
>> This SF.Net email is sponsored by the Moblin Your Move Developer's
>> challenge
>> Build the coolest Linux based applications with Moblin SDK & win great
>> prizes
>> Grand prize is a trip for two to an Open Source event anywhere in the
>> world
>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> _______________________________________________
>> Jython-dev mailing list
>> Jython-dev@...
>> https://lists.sourceforge.net/lists/listinfo/jython-dev
>>
>>
>


-- 
"Qui allume sa bougie à la mienne reçoit de la lumière sans me plonger dans
l'obscurité…"
' Thomas Jefferson'

Re: [Jython-users] [Jython-dev] Jython help ?

[Tobias Ivarsson <thobes@gm...>]

Hi,

This type of question should really be directed to jython-users, jython-dev
is for discussion regarding development of Jython. I am cc'ing the
jython-users list.

jythonc is heavily deprecated. It is no longer a supported but still
available as is. Another tool with similar functionality might be made
available in the future, but the exact details have not been mapped out yet.

The preferred way of including python code in your Java application using
Jython is to embed Jython using org.python.core.PythonInterpreter in your
Java application.

Something like this:

PythonInterpreter python = ...
python.exec("import mylibrary");
python.exec("entry_object = mylibrary.EntryClass()");
PyObject entryObject = python.get("entry_object");

/Tobias

On Mon, Jul 21, 2008 at 12:22 PM, Baroudi Malek <baroudi.malek@...>
wrote:

> Hello Jython Dev list,
>
> I'm newbie in jython and I would to know if I can I use some python GIS
> library in my java project with Jython ?
>
> My problem is how to use some ".py" file in my java application,I tried
> jythonc --core --deep --jar appletdemo.jar *.py
> in console but I have this error :
>
> ./jpywork/socket.java:737: as of release 1.4, 'assert' is a keyword, and
> may not be used as an identifier
> (use -source 1.3 or lower to use 'assert' as an identifier)
>             if (frame.getglobal("__debug__").__nonzero__())
> Py.assert(frame.getlocal(0).__getattr__("sock"));
>                                                                ^
>
> my python library is here :
> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Formats/KML.py
>
> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Formats/OSM.py
>
> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Formats/WFS.py
>
> http://svn.featureserver.org/trunk/vectorformats/vectorformats/Feature.py
>
>
> Thank you in advance.
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Jython-dev mailing list
> Jython-dev@...
> https://lists.sourceforge.net/lists/listinfo/jython-dev
>
>