Reminder -- Jython Monthly Interview of Jim Baker

Reminder -- Time is running out for the Jython Monthly question and
answer session
with Jim Baker.

He has agreed to answer questions from the community for our
newsletter. Gather your best questions and post them to the wiki at
the URL below. If you have issues posting the questions on the wiki
page, then please email them to me so that they can be included. The
deadline for posting questions is September 19th. After that time, Jim Baker
will choose which ones he wishes to answer and we will
include them in the next distribution.

Please post your questions for Jim at:
http://wiki.python.org/jython/JythonMonthly/Interviews/August2008/JimBaker
and feel free to include your name/email address if you'd like.

Thanks in advance for your participation...this is a great opportunity
for the Jython community.

Special thanks to Jim Baker for his time!

--

-- 
Josh Juneau
juneau001 <at> gmail.com
http://jj-blogger.blogspot.com
http://www.gathereventplanning.com
Twitter ID: javajuneau

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Re: Please explain how to get imports to work for embedded Jython in a .jar

> From: Greg Scott <gregory.scott99 <at> imperial.ac.uk>
> To: Dave Kuhlman <dkuhlman <at> rexx.com>
> Sent: Sunday, August 31, 2008 1:22:54 PM
> Subject: RE: Please help with embedded Jython with .JAR question
>
> Hi Dave
>
> Thank you so much for this. But remember, my completed project is not of
> this form because the jython.jar is included in the classpath. The program
> remember is executed from a normal .class file and the Jython embedded via
> JS223. So there are 2 or more jars involved. I have tried putting a Lib
> directory in my My.jar but this is nothing to do with the library/jar of
> jython.jar which is included. Are you saying I have to alter the actual
> jython.jar to get this to work? Surely not?
>

Greg -

I believe that I've given you about as much help as I am capable
of.  I'm someone who has been able to come up with a few recipes
that, I hope, handle a reasonable number of common cases, but who
does not really understand the underlying theory well enough to go
much further.

I'm not saying that you *have to* modify the jython.jar.  But,
creating a replacement for it (which is what the stand-alone jar
is) might be one approach to filling your need.

And, if not, here are several questions that might suggest a
solution:

Re: TypeError question

Hi Heshan,

just a guess: I assume that the getDictionary() method of Processor
wants a String as argument.

Then you could use:
  String stt = "Processor.getDictionary(\"" + filePath +"\")";
or:
  String stt = "Processor.getDictionary('" + filePath +"')";
instead of:
  String stt = "Processor.getDictionary(" + filePath +")";

(basically surround the filePath with single or double quotes.

Hope this helps,
Oti.

On Mon, Aug 25, 2008 at 10:45 AM, Heshan Suriyaarachchi
<heshan.suri <at> gmail.com> wrote:
> Hi,
>     I need to analyse a python script(annotationScript.py) from another
> python script(Processor) within java.
> 1). I did like below and it gave an error. It is  confusing for me because
> when I called the method using python it worked without errors. Can anyone
> help me to overcome this error.
>
> //java code
>         interp.exec("import annotationScript");
>         interp.exec("import Processor");
>         String stt = "Processor.getDictionary(annotationScript)";

Re: Trapping errors in scripts at runtime.

[David]
> Can anyone suggest a way of trapping exceptions in runtime script execution ?

Is this what you mean?

//============== CatchExceptions.java =====================
import org.python.core.*;
import org.python.util.PythonInterpreter;

public class CatchExceptions
{

  public static void runDodgyCode ( PythonInterpreter interp, String
codeString )
  {
    try
    {
      interp.exec(codeString);
    }
    catch (PyException pyx)
    {
      if (pyx.type == Py.IndexError)
        System.err.println("This code >>>"+codeString+"<<< gave an
index error");
      if (pyx.type == Py.KeyError)
        System.err.println("This code >>>"+codeString+"<<< gave a key error");
      if (pyx.type == Py.SyntaxError)
        System.err.println("This code >>>"+codeString+"<<< gave a
syntax error");
      if (pyx.type == Py.ZeroDivisionError)

Re: Trapping errors in scripts at runtime.

No, he means something like this:

  // codeString defines a Jython class implementating of a Java interface
  // and creates an instance of the class.
  interp.exec(codeString);
  AnInterface obj = 
(AnInterface)interp.get("obj").__tojava__(AnInterface.class);

  // Later.
  try {
    obj.someMethodWithBadJythonImplementation();
  } catch (PyException pyEx) {
    // Does catching PyException here work?
  }

Alan Kennedy wrote:
> [David]
>   
>> Can anyone suggest a way of trapping exceptions in runtime script execution ?
>>     
>
> Is this what you mean?
>
> //============== CatchExceptions.java =====================
> import org.python.core.*;
> import org.python.util.PythonInterpreter;
>
> public class CatchExceptions
> {
>

Re: Trapping errors in scripts at runtime.

[Jeff]
> No, he means something like this:
>
>  // codeString defines a Jython class implementating of a Java interface
>  // and creates an instance of the class.

OK, then here is the code that he needs.

//============================================================
import org.python.core.*;
import org.python.util.PythonInterpreter;

public class CatchExceptions
{

  public static Object compileCodeAndGetClass (
      PythonInterpreter interp,
      String            codeString,
      String            targetClassName,
      String            name)
    throws Exception
  {
    interp.exec(codeString);
    PyObject pyObj = (PyObject)interp.get(name).__call__();
    if (pyObj == null)
      throw new Exception("Cannot find definition of '"+
        name+"' class");
    Class targetClass = Class.forName(targetClassName);
    Object jObj = pyObj.__tojava__(targetClass);
    if (jObj == Py.NoConversion)

Re: Packaging and deployment

On Sun, Aug 24, 2008 at 8:51 PM, JLIST <jlist9 <at> gmail.com> wrote:
> Hello Leo,
>> I'm pretty sure it will work without the $py.class files. I think that
>> it is the "Lib/" directory though, with a capital 'L'.
>
> I see. Thanks. In this case, I suppose Jython will compile them
> on the fly in a temp directory?
>
> Jack

Hi Jack,

it will compile into memory only, AFAICT.

best wishes,
Oti.

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UnsatisfiedLinkError Issue

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Jython developer build 'UnsatisfiedLinkError' issue

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