problem with jython and threads

[ag356]

Hi. Can anyone tell me why the following does not work?

== Begin

import org.python.util.PythonInterpreter;

public class test {

  public static void main(String[] args) throws Exception {
    for (int i = 0; i < 10; i++) {
      new Thread () {
        public void run () {
          String code = "s = \"Hello " +
            Thread.currentThread().getName() +
            "\"\nb = unicode(s,\"utf-8\")\nprint b\n";
          System.out.println("code:\n"+code);
          PythonInterpreter interp = new PythonInterpreter();
          interp.exec(code);
        }
      }.start();
    }
  }

}

== End

I get "LookupError: no codec search functions registered: can't find encoding" for usually all but one of the threads. Sometimes two or three of them work.

If I add "import encodings" to the beginning of the script then it works.

Any help would be greatly appreciated!

[Charlie Groves]

On Thu, Nov 6, 2008 at 2:39 PM, ag356 <gertner@...> wrote:

>
> Hi. Can anyone tell me why the following does not work?
>
> == Begin
>
> import org.python.util.PythonInterpreter;
>
> public class test {
>
>  public static void main(String[] args) throws Exception {
>    for (int i = 0; i < 10; i++) {
>      new Thread () {
>        public void run () {
>          String code = "s = \"Hello " +
>            Thread.currentThread().getName() +
>            "\"\nb = unicode(s,\"utf-8\")\nprint b\n";
>          System.out.println("code:\n"+code);
>          PythonInterpreter interp = new PythonInterpreter();
>          interp.exec(code);
>        }
>      }.start();
>    }
>  }
>
> }
>
> == End
>
> I get "LookupError: no codec search functions registered: can't find
> encoding" for usually all but one of the threads. Sometimes two or three of
> them work.
>
> If I add "import encodings" to the beginning of the script then it works.

Looks like we're not synchronizing properly when initializing the
codec lookup in org.python.core.codecs.  I've opened
http://bugs.jython.org/issue1169 to track hunting this down.  I
imagine this is something we'll take care of before releasing 2.5, but
I'm not sure how long it will be before someone really takes a look at
it.

Charlie

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[Philip Jenvey-3]

On Nov 6, 2008, at 2:39 PM, ag356 wrote:

>
> Hi. Can anyone tell me why the following does not work?

<snip>

> I get "LookupError: no codec search functions registered: can't find
> encoding" for usually all but one of the threads. Sometimes two or  
> three of
> them work.
>
> If I add "import encodings" to the beginning of the script then it  
> works.
>
> Any help would be greatly appreciated!

Is this on Jython 2.2? I can't reproduce this on trunk.

--
Philip Jenvey

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[ag356]

Yes, this was with jython 2.2.1.

I just tried it with 2.5b0 and it did not have the problem. So this does seem to be fixed in the newer versions.

-ag

Philip Jenvey-3 wrote:

Is this on Jython 2.2? I can't reproduce this on trunk.

--
Philip Jenvey

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