Issue1169

From
http://www.nabble.com/problem-with-jython-and-threads-to20371245.html#a20371245:

== 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.

Charlie, Isn't this same problem as I reported earlier?

http://www.nabble.com/thread-safety-of-codecs.java%3Aregistry_init%28%29-to14847747.html#a14847747

I remember that you fixed it at that time. The following is the relevant
check-in comment I found for codecs.java

-----
r4059 | cgroves | 2008-01-19 17:52:16 -0500 (Sat, 19 Jan 2008) | 1 line

synchronize around registry_init so if two threads start up and use
codecs immediately, they both get a valid list of encodings
-----

It's something like that, but it looks like we didn't manage to
synchronize everything that needed to be synchronized.  I haven't had a
chance to look at what's getting out of whack.

This must be a 2.2 bug -- can't reproduce it on 2.5 with even 30 threads. 
I sent the originator an email, asking if it was

No response from the originator: this must have just been a 2.2 bug, 
resolved in 2.5