jython-dev — Discussion of developing and enhancing Jython itself(!) (not how to use Jython)

RE: [Jython-dev] applet problems

[Coleman, D. <don...@em...>]

Classes compiled with Java2 will work on IE if you don't use 1.2 specific
features.

You can tell javac which VM version to generate class files for with the
-target option

javac -target 1.1 Foo.java

BTW, target 1.1 is the default

For more info see
http://java.sun.com/j2se/1.3/docs/tooldocs/win32/javac.html

> -----Original Message-----
> From: Samuele Pedroni [mailto:pe...@in...]
> Sent: Friday, February 02, 2001 7:00 PM
> To: jyt...@so...; jyt...@li...
> Subject: [Jython-dev] applet problems
> 
> 
> Hi.
> 
> If I remember well if an applet is compiled under a java2 
> javac it won't work
> under MS Explorer. It should be
> compiled with a java 1.1 javac.
> Finn can say more on that.
> 
> regards, Samuele Pedroni
> 
> PS: something about that issue must go in the doc and in the faq.
> 
> 
> _______________________________________________
> Jython-dev mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-dev
> 

[Jython-dev] applet problems

[Samuele P. <pe...@in...>]

Hi.

If I remember well if an applet is compiled under a java2 javac it won't work
under MS Explorer. It should be
compiled with a java 1.1 javac.
Finn can say more on that.

regards, Samuele Pedroni

PS: something about that issue must go in the doc and in the faq.

[Jython-dev] jython 2 java class - help?????

[Kieran B. <Kie...@ci...>]

Can anyone tell me if they have had much success with this?

I can follow the Graph.py demo and I get this to work. With this demo you
get a PythonGraph.java file to javac.

When I attempt this for MyEg.py, I get the MyEg.class files, but I don't get
the PythonMyEg.java file to compile.

I also want to be able to create a jar that I can deply on another VM that
does not have jython-2.0 installed.

My exmaple does derive from java.lang.Object, it does work from jythjon.bat
and has a if __main...... thingy.

Any help appreciated.
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Re: [Jython-dev] servlet problem self.getInitParameterNames() und er PyServlet wrapper

[<bc...@wo...>]

[Dave]

>>             servlet.init(getServletConfig());
>
>This call was added to the version of PyServlet that I posted to
>jpython-interest back in May last year.  Chris Gokey and I had a discussion
>around that time, and upgraded the then currently available PyServlet.
>Maybe we should try and merge that version with whatever people are using
>these days?

Yes please. 

Could we avoid such problems by including some version of PyServlet in
org.python.util? With the author's (who?) permission ofcourse.

regards,
finn

Re: [Jython-dev] Jython console under Tru64 Unix

[<bc...@wo...>]

[Adam Burke]

>Odd problem.  Jython console started with no parameters fails with an
>"IOError - File not found -".  However the problem goes away when the
>interpreter is started with a script param or started with the -v =
>option.
>
>Compaq Tru64 Unix
>uname -a
>OSF1 supanova V4.0 1229 alpha=20
>
>Trace / config
>
>prompt>jython
>Traceback (innermost last):
>  (no code object) at line 0
>IOError: File not found -  (No such file or directory)
>supanova /usr/users/supastar/gway/bin =3D> jython -v
>import: 'exceptions' as org.python.core.exceptions in builtin modules
>Jython 2.0 on java1.2.2-1 (JIT: jit_122)
>import: 'site' as /usr/local/jython-20/Lib/site.py
>import: 'sys' as sys in builtin modules
>import: 'os' as org.python.modules.os in builtin modules
>import: 'javaos' as /usr/local/jython-20/Lib/javaos.py
>import: 'java' as java package
>import: 'File' as java class
>import: 'javapath' as /usr/local/jython-20/Lib/javapath.py
>import: 'System' as java class
>import: 'sitecustomize' not found (ImportError)
>Type "copyright", "credits" or "license" for more information.
>>>> ^D
>supanova /usr/users/supastar/gway/bin =3D> java -fullversion
>java full version "J2SDK.v.1.2.2:09/30/1999-19:00"
>supanova /usr/users/supastar/gway/bin =3D> whence java
>/usr/opt/java122/bin/java
>supanova /usr/users/supastar/gway/bin =3D> java -version
>java version "1.2.2-1"
>Classic VM (build J2SDK.v.1.2.2:09/30/1999-19:00, native threads, =
>jit_122) =20
>
>I've also tried it with jdk118 on this platform.  I only see the =
>problem on
>this platform.  It looks like the "-" convention for stdin is not being
>recognised.

No, I don't think so:

i:\java\jython.cvs\org\python\core>jython xxx
Traceback (innermost last):
  (no code object) at line 0
IOError: File not found - xxx (The system cannot find the file
specified)

So the '-' in the error text is part of the exception text. Instead it
seems as if an empty string is passed to java as an argument.

>I should be able test patches / configuration changes /
>suggestions if you don't have access to this env, though I haven't got =
>a lot
>of time to give to it.  Any suggested starting points?

The generated script use "$@" to pass the script arguments to java. If
no arguments are supplied, perhaps Tru64 will pass it as "". Try to
change the "jython" script to use some other way of passing the args:

  java .... org.python.util.jython $1 $2 $3 $4 $5

This is too naive for production use, but I think it can help illustrate
where the problem is. Changing the shell in the first line of the script
might also help.

If none of that helps, try to enter the full java command from the
script on the command line, but with any args:

  java -Dpython.home=.. -classpath ".." org.python.util.jython

Only if that also fails will I believe there is a problem with the java
VM you are using.

regards,
finn

RE: [Jython-dev] servlet problem self.getInitParameterNames() und er PyServlet wrapper

[David S. <ds...@al...>]

>             servlet.init(getServletConfig());

This call was added to the version of PyServlet that I posted to
jpython-interest back in May last year.  Chris Gokey and I had a discussion
around that time, and upgraded the then currently available PyServlet.
Maybe we should try and merge that version with whatever people are using
these days?

Dave.

Re: [Jython-dev] servlet problem self.getInitParameterNames() under PyServlet wrapper

[<bc...@wo...>]

[Brian Zhou]

>Hello list,
>
>Following http://groups.yahoo.com/group/jpython/message/3714 I succeeded
>making servlet running under PyServlet wrapper/handler on win2k tomcat3.2.1.
>So far so good, I can run simple script like:
>
>import sys, java, javax
>
>class hello(javax.servlet.http.HttpServlet):
>   def doGet(self, req, res):
>      res.setContentType("text/html");
>      out = res.getOutputStream()
>      out.println("""\
><html>
><head><title>Hello World</title></head>
><body>Hello World!
><P>
>current server time is: %s
></P>
></body>
></html>
>""" % (java.util.Date()))
>      out.close()
>      return
>
>Or even dynamicly generate PNG graph thanks to the new javax.imagio package
>from Sun. I don't expect any difficulty hooking up with database using JDBC.
>
>However, when trying to port SnoopServlet from java to jython, I found that
>PyServlet really doesn't handover any instant variables to the jython
>HttpServlet subclass except (request, response). So
>
>    enum = self.getInitParameterNames()
>
>will got a NullPointerException. Any operation involve self.attribute like
>self.getServletContext() will also fail. I don't think jythonc compiled
>classes will have this problem because the jython servlet handle service()
>directly bypassing PyServlet.
>
>So my questions are:
>
>1. Am I missing anything? Any misunderstanding of the API?

I'm no expert on servlets, but I think the servlet must be initialized
somehow. By adding 

            servlet.init(getServletConfig());

to PyServlet.loadServlet(), I managed to avoid the NPE in
getInitParameterNames(). 


regards,
finn

Re: [Jython-dev] 'ababab'.count() bug

[<bc...@wo...>]

[Ype Kingma]

>Dear developers,
>
>Tried to report this via soureforge but the bugid bug
>is still there.
>In jython 2.0 a3 I have this:
>
>'aaa'.count('a',0,2) == 2, ok, and
>
>'ababab'.count('ab',0,5) == 3, should be 2 (CPython also gives 2).
>
>'defdefdef.count('def',0,8) == 3, should also be 2.
>
>Using blackdown java 1.3, powerpc, no jit.
>
>You might want to add sth like this to test_string.py,
>count() is untested there:
>
>  test('count', 'aaa', 3, 'a')
>  test('count', 'aaa', 2, 'a', 0, 2)
>  test('count', 'ababab', 3, 'ab', 0)
>  test('count', 'ababab', 2, 'ab', 0, 5)
>  test('count', 'ababab', 2, 'ab', 1)
>  test('count', 'ababab', 2, 'ab', 1, 6)
>  test('count', 'ababab', 0, 'abc')
>  test('count', 'ababab', 0, '')

Thanks, I have added this (except for the last test which should return
7 according to CPython).

regards,
finn

Re: [Jython-dev] stringbuffer.py

[<bc...@wo...>]

[Ype Kingma]

>"""
>stringbuffer.py: mutable string built on java.lang.StringBuffer.
>
>The idea is to save as many string object creations as possible
>while still be about as fast as string's, when implemented
>in Java.  This python module is intended as a prototype.
>
>
>The itch:
>
>I needed java.lang.StringBuffer functionality in jython
>on the receiving side of a socket.
>I grew tired of writing:
>     buf += sock.recv(maxSize)
>which creates a new buf everytime
>sock.recv(maxSize) is called. Note that sock.recv()
>may return as little as it likes, depending on
>network traffic conditions.
>The alternative of keeping a list of received
>strings did not really appeal to me.
>
>
>The questions:
>
>- This may have been done umpteen times before, when so
>   could someone please tell me?

There is a UserString.MutableString class, but it have a diffrent
purpose. A module that wraps a StringBuffer could be usefull as a
standard module.

>- I added the standard string methods.
>   Only when these originally return a string I have them put
>   the result back into the stringbuffer.
>   Methods that return something else work as if they
>   were used on a string.
>   Is this the right approach? Esp. for split() and friends?

Hard to say. If you haven't already, you can take a look at which
methods in UserString.UserString that returns strings and which that
return UserStrings.

>- I don't know whether I handled python default arguments
>   correctly, eg:
>
>     def count(self, sub, start = None, end = None):
>	if start == None:
>	    if end == None:
>		return str(self).count(sub)
>	    else:
>		return str(self).count(sub, 0, end)
>	elif end == None:
>	    return str(self).count(sub, start)
>	else:
>	    return str(self).count(sub, start, end)
>
>   (str(self) should disappear in the java version ...)

That is too much work. UserString simply does:

    def count(self, sub, start=0, end=sys.maxint):
        return self.data.count(sub, start, end)

Another way to deduce the default values are by looking at the PyString
sources for count(..):

    public int count(String sub) {
        return count(sub, 0, string.length());
    }
    public int count(String sub, int start) {
        return count(sub, start, string.length());
    }
    public int count(String sub, int start, int end) {
        ...
    }

The last count method will validate the start/end indexes so the
sys.maxint trick also works.

>- Is an extend() method needed? It is marked as experimental
>   in my python 2.0 documentation.

Hard to say. The [].extend() is now used by standard python library so I
think it is safe to say that it will remain. I see no problem with
adding it to stringbuffer and marking it non-experimental.

>- Should slicing be allowed with other steps than 1?

No. I don't see much use for it. After all, strings are not meant as
general sequence. We have real lists for that.

>- pop() also works for slices, is that ok.?

I don't see much use for that either. It's a minor thing.

>Aside: in the sort() method this line gives an internal compiler error:
>    l = [self[i] for i in range(len(self))] # internal compiler error: 
>name i (jython2.0a3)
>Why?

Because there was an internal compiler error in 2.0alpha3 <wink>. It was
a bug where fast locals in listcomps was not correctly detected.

OTOH, sorting a stringbuffer is bogus. Cute but mostly useless. I'd
rather avoid adding a sort method.


I modified a copy if CPython's test_userstring.py. You should try it, it
caught some typos. It must be run from CPython's ./Lib/test directory.


#!/usr/bin/env python
import sys, string
from test_support import verbose
import string_tests
# UserString is a wrapper around the native builtin string type.
# UserString instances should behave similar to builtin string objects.
# The test cases were in part derived from 'test_string.py'.
from stringbuffer import stringbuffer

if __name__ == "__main__":
    verbose = 0

tested_methods = {}

def test(methodname, input, *args):
    global tested_methods
    tested_methods[methodname] = 1
    if verbose:
        print '%s.%s(%s) ' % (input, methodname, args),
    u = stringbuffer(input)
    objects = [input, u, stringbuffer(u)]
    res = [""] * 3
    for i in range(3):
        object = objects[i]
        try:
            f = getattr(object, methodname)
            res[i] = apply(f, args)
        except:
            res[i] = sys.exc_type
    if res[0] != res[1]:
        if verbose:
            print 'no'
        print `input`, f, `res[0]`, "<>", `res[1]`
    else:
        if verbose:
            print 'yes'
    if res[1] != res[2]:
        if verbose:
            print 'no'
        print `input`, f, `res[1]`, "<>", `res[2]`
    else:
        if verbose:
            print 'yes'

string_tests.run_method_tests(test)


regards,
finn

Re: [Jython-dev] How to copy the whole python tutorial at one go?

[<bc...@wo...>]

[Vallish M.N]

>sir,
>         I want to know  that how should i copy the whole python tutorial at
>one go,(i.e without doing cut and paste everytime)?
>And i also want to know that is this tutorials are available in Pdf
>format.If yes then from where shall I get that.

  http://www.python.org/doc/current/download.html

>Also  are Python and Jpython
>are different or same(i.e  the tutorials for python and Jpython are same or
>different)?

There are some difference:

  http://www.jython.org/docs/differences.html

but the Python tutorial covers both implementations.

regards,
finn

[Jython-dev] How to copy the whole python tutorial at one go?

[Vallish M.N <va...@ka...>]

sir,
         I want to know  that how should i copy the whole python tutorial at
one go,(i.e without doing cut and paste everytime)?
And i also want to know that is this tutorials are available in Pdf
format.If yes then from where shall I get that.Also  are Python and Jpython
are different or same(i.e  the tutorials for python and Jpython are same or
different)?
             Please send the reply of these questions as soon as possible?
                                        My Email Id
                                        va...@ka...

Thankyou,

vallish

[Jython-dev] servlet self.getInitParameterNames() problem solved

[Brian Z. <bri...@ya...>]

With the changes I made, it works great now. Here are the two classes I
changed:
    pyservlet.PyHandler    in the place of the old PyServlet
    pyservlet.HandlerAwareHttpServlet

The same handler can deal with both 1) jython servlet derived from
HttpServlet and 2) jython servlet derived from HandlerAwareHttpServlet.
Fortunately most info is from request, so only when you need to port
SnoopServlet do you need to use 2.

I also send this to the jython-dev list in hoping that in future
release, we can have servlet support built-in. I view this as one of the
big strength of using jython, if JSP is mod_php to apache, we have the
equivalent of mod_python now. JDBC, XMLC, imageio, the possiblilities
are endless.

Following are the two java files and some sample jython servlet scripts. I
love it! Thank you
jython developers.

/Brian

// pyservlet/HandlerAwareHttpServlet.java

package pyservlet;

import javax.servlet.http.*;

/**
 *
 * @author <a href="mailto:bri...@ya...">Brian Zhou</a>
 */

public abstract class HandlerAwareHttpServlet extends HttpServlet {
    protected HttpServlet theHandler = null;
    public void setHandler(HttpServlet aHandler) {
        this.theHandler = aHandler;
    }
    public HttpServlet getHandler() {
        return this.theHandler;
    }
}

// pyservlet/PyHandler.java

package pyservlet;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.python.util.PythonInterpreter;
import org.python.core.*;

/**
 * This servlet is used to tell the if the Apache JServ installation was
 * successful.
 *
 * @author <a href="mailto:stefano@a...">Stefano Mazzocchi</a>
 */
public class PyHandler extends HttpServlet {

    static Hashtable servlets = new Hashtable(); // Cache for HttpServlet
    static Hashtable dates = new Hashtable();   // Timestamps for Cache
entries

    PythonInterpreter interp = new PythonInterpreter();

    public void service (ServletRequest req, ServletResponse res)
        throws ServletException, IOException
    {
        HttpServlet servlet =
            getServlet(getServletContext().getRealPath(
                ((HttpServletRequest)req).getServletPath()) );
        if (servlet != null) {
            if (servlet instanceof HandlerAwareHttpServlet) {
                ((HandlerAwareHttpServlet) servlet).setHandler(this);
            }
            servlet.service(req, res);
        }
    }

    HttpServlet getServlet(String path)
        throws ServletException, IOException
    {
        Long date = (Long) dates.get(path);
        if (date != null) {                     // Check for cache validity
            File file = new File(path);
            if (date.longValue() < file.lastModified())   // Cache invalid
                return (loadServlet(path));               // Reload servlet
            else
                return ((HttpServlet) servlets.get(path));
        } else {
            return (loadServlet(path));        // Not in cache, load servlet
        }
    }

    HttpServlet loadServlet(String path)
        throws ServletException, IOException
    {
        HttpServlet servlet = null;
        File file = new File(path);

        // Extract servlet name from path (strip ".../" and ".py")
        int start = path.lastIndexOf(System.getProperty("file.separator"));
        if (start < 0)
            start = 0;
        else
            start++;
        int end = path.lastIndexOf(".py");
        if (end < 0 || end <= start)
            end = path.length();

        try {                                             // Create servlet
            interp.execfile(path);
            PyObject pyServlet = interp.eval(path.substring(start,
end)+"()");
            servlet =
                (HttpServlet) pyServlet.__tojava__(
                    Class.forName("javax.servlet.http.HttpServlet"));
        }
        catch (PyException e) {
            System.err.println(e);
                throw new ServletException("Could not create Jython
servlet");
        }
        catch (ClassNotFoundException e) {
            System.err.println(e);
                throw new ServletException("Could not create Jython
servlet");
        }
        servlets.put(path, servlet);                  // Add servlet to
cache
        dates.put(path, new Long(file.lastModified()));   // Add timestamp
        return (servlet);
    }

}

# hello.py
import sys, java, javax

class hello(javax.servlet.http.HttpServlet):
   def doGet(self, req, res):
      res.setContentType("text/html");
      out = res.getOutputStream()
      out.println("""\
<html>
<head><title>Hello World</title></head>
<body>Hello World!
<P>
current server time is: %s
</P>
</body>
</html>
""" % (java.util.Date()))
      out.close()
      return

# titles.py
import java, javax

class titles(javax.servlet.http.HttpServlet):

  def doGet(self, request, response):
    response.setContentType("text/plain")
    out = response.getOutputStream()
    self.dbTitles(out)
    out.close()
    return

  def dbTitles(self, out):
    server, db = "ncv-dev2", "pubs"
    usr, passwd = "sa", ""
    driver = "com.inet.tds.TdsDriver"
    port = 1433
    url = "jdbc:inetdae:" + server + ":" + `port` + "?database=" + db
    java.lang.Class.forName(driver).newInstance()
    conn = java.sql.DriverManager.getConnection(url, usr, passwd)
    query = "select title, price, ytd_sales, pubdate from titles"
    stmt = conn.createStatement()
    if stmt.execute(query):
        rs = stmt.getResultSet()
        while rs and rs.next():
            out.println(rs.getString("title"))
            if rs.getObject("price"):
                out.println("%2.2f" % rs.getFloat("price"))
            else:
                out.println("null")
            if rs.getObject("ytd_sales"):
                out.println(rs.getInt("ytd_sales"))
            else:
                out.println("null")
            out.println(rs.getTimestamp("pubdate").toString())
            out.println()
    stmt.close()
    conn.close()

# snoop.py
from pyservlet import HandlerAwareHttpServlet

class snoop(HandlerAwareHttpServlet):

    def doGet(self, request, response):
        out = response.getOutputStream()
        response.setContentType("text/plain");

        out.print("""\
Snoop Servlet
""")

        out.print("""\

Servlet init parameters:
""")
        enum = self.getHandler().getInitParameterNames()
        while enum.hasMoreElements():
            key = enum.nextElement()
            value = self.getInitParameter(key)
            out.print("""\
    %s = %s
""" % (key, value))

        out.print("""\

Context init parameters:
""")
        context = self.getHandler().getServletContext()
        enum = context.getInitParameterNames()
        while enum.hasMoreElements():
            key = enum.nextElement()
            value = context.getInitParameter(key)
            out.print("""\
    %s = %s
""" % (key, value))

        out.print("""\

Context attributes:
""")
        context = self.getHandler().getServletContext()
        enum = context.getAttributeNames()
        while enum.hasMoreElements():
            key = enum.nextElement()
            value = context.getAttribute(key)
            out.print("""\
    %s = %s
""" % (key, value))

        out.print("""\

Request attributes:
""")
        enum = request.getAttributeNames()
        while enum.hasMoreElements():
            key = enum.nextElement()
            value = request.getAttribute(key)
            out.print("""\
    %s = %s
""" % (key, value))

        out.print("""\

Servlet Name:       %s
Protocol:           %s
Scheme:             %s
Server Name:        %s
Server Port:        %s
Server Info:        %s
Remote Addr:        %s
Remote Host:        %s
Character Encoding: %s
Content Length:     %s
Content Type:       %s
Locale:             %s
Default Response Buffer Size: %s
""" % (
    self.getHandler().getServletName(),
    request.getProtocol(),
    request.getScheme(),
    request.getServerName(),
    request.getServerPort(),
    self.getHandler().getServletContext().getServerInfo(),
    request.getRemoteAddr(),
    request.getRemoteHost(),
    request.getCharacterEncoding(),
    request.getContentLength(),
    request.getContentType(),
    request.getLocale(),
    response.getBufferSize()
))

        out.print("""\

Parameter names in this request:
""")
        enum = request.getParameterNames()
        while enum.hasMoreElements():
            key = enum.nextElement()
            values = request.getParameterValues(key)
            out.print("    '%s' = " % key)
            for value in values:
                out.print("'%s' " % value)
            out.println()

        out.print("""\

Headers in this request:
""")
        enum = request.getHeaderNames()
        while enum.hasMoreElements():
            key = enum.nextElement()
            value = request.getHeader(key)
            out.print("""\
    %s = %s
""" % (key, value))

        out.print("""\

Cookies in this request:
""")
        cookies = request.getCookies()
        for cookie in cookies:
            out.print("""\
    %s = %s
""" % (cookie.getName(), cookie.getValue()))

        out.print("""\

Request Is Secure:      %s
Auth Type:              %s
HTTP Method:            %s
Remote User:            %s
Request URI:            %s
Context Path:           %s
Servlet Path:           %s
Path Info:              %s
Path Trans:             %s
Query String:           %s
""" % (
    request.isSecure(),
    request.getAuthType(),
    request.getMethod(),
    request.getRemoteUser(),
    request.getRequestURI(),
    request.getContextPath(),
    request.getServletPath(),
    request.getPathInfo(),
    request.getPathTranslated(),
    request.getQueryString()
))

        session = request.getSession()
        out.print("""\

Requested Session Id:                   %s
Current Session Id:                     %s
Session Created Time:                   %s
Session Last Accessed Time:             %s
Session Max Inactive Interval Seconds:  %d
""" % (
    request.getRequestedSessionId(),
    session.getId(),
    session.getCreationTime(),
    session.getLastAccessedTime(),
    session.getMaxInactiveInterval()
))

        out.print("""\

Session values:
""")
        names = session.getAttributeNames()
        while names.hasMoreElements():
            name = names.nextElement()
            out.println("    '%s' = '%s'" % (name,
session.getAttribute(name)))

        out.close()
        return

----- Original Message -----
From: "Brian Zhou" <bri...@ya...>
To: <jyt...@li...>
Cc: <jyt...@li...>
Sent: Wednesday, January 31, 2001 9:34 AM
Subject: [Jython-users] servlet problem self.getInitParameterNames()
under PyServlet wrapper


> Hello list,
>
> Following http://groups.yahoo.com/group/jpython/message/3714 I
succeeded
> making servlet running under PyServlet wrapper/handler on win2k
tomcat3.2.1.
> So far so good, I can run simple script like:
>
> import sys, java, javax
>
> class hello(javax.servlet.http.HttpServlet):
>    def doGet(self, req, res):
>       res.setContentType("text/html");
>       out = res.getOutputStream()
>       out.println("""\
> <html>
> <head><title>Hello World</title></head>
> <body>Hello World!
> <P>
> current server time is: %s
> </P>
> </body>
> </html>
> """ % (java.util.Date()))
>       out.close()
>       return
>
> Or even dynamicly generate PNG graph thanks to the new javax.imagio
package
> from Sun. I don't expect any difficulty hooking up with database using
JDBC.
>
> However, when trying to port SnoopServlet from java to jython, I found
that
> PyServlet really doesn't handover any instant variables to the jython
> HttpServlet subclass except (request, response). So
>
>     enum = self.getInitParameterNames()
>
> will got a NullPointerException. Any operation involve self.attribute
like
> self.getServletContext() will also fail. I don't think jythonc
compiled
> classes will have this problem because the jython servlet handle
service()
> directly bypassing PyServlet.
>
> So my questions are:
>
> 1. Am I missing anything? Any misunderstanding of the API?
> 2. Any way around? Anyone got a better PyServlet?
> 3. If I'm the first one got bitten, any idea how we may overcome this
> problem?
>
> Seeing the power of dynamic python scripting at work (instant feedback
> without re-compiling), I really appreciate what have been done so far,
and
> want to get it going. Here are some of my ideas:
>
> 1. We can have two seperate subclasses of HttpServlet in java:
>     one possibly named ServletPyHandler, doing what PyServlet
currently is
> doing, dispatching service() calls to jython servlet;
>     the other JyServlet being superclass of all jython servlets, with
> constructor JyServlet(ServletPyHandler), so JyServlet always has a ref
to
> the ServletPyHandler instance;
> The downside of this approach is that now jythonc compiled servlet and
> dynamically interpreted servlet have to be written differently.
>
> 2. Have ServletPyHandler do somthing to the jython servlet class right
> before dispatching service() call, so that inside jython servlet,
later when
> messages like  self.getInitParameterNames() will be redirected back to
> ServletPyHandler.
>
> TIA for any ideas,
>
> /Brian
>
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-dev] Re: servlet problem self.getInitParameterNames() solved

[Brian Z. <bri...@ya...>]

It works great with the change I made. Attached are the two classes I
changed:
    pyservlet.PyHandler    in the place of the old PyServlet
    pyservlet.HandlerAwareHttpServlet

The same handler can deal with both 1) jython servlet derived from
HttpServlet and 2) jython servlet derived from HandlerAwareHttpServlet.
Fortunately most info is from request, so only when you need to port
SnoopServlet do you need to use 2.

I also send this to the jython-dev list in hoping that in future
release, we can have servlet support built-in. I view this as one of the
big strength of using jython, if JSP is mod_php to apache, we have the
equivalent of mod_python now. JDBC, XMLC, imageio, the possiblilities
are endless.

Following are some sample jython servlet scripts. I love it! Thank you
jython developers.

/Brian

# hello.py
import sys, java, javax

class hello(javax.servlet.http.HttpServlet):
   def doGet(self, req, res):
      res.setContentType("text/html");
      out = res.getOutputStream()
      out.println("""\
<html>
<head><title>Hello World</title></head>
<body>Hello World!
<P>
current server time is: %s
</P>
</body>
</html>
""" % (java.util.Date()))
      out.close()
      return

# titles.py
import java, javax

class titles(javax.servlet.http.HttpServlet):

  def doGet(self, request, response):
    response.setContentType("text/plain")
    out = response.getOutputStream()
    self.dbTitles(out)
    out.close()
    return

  def dbTitles(self, out):
    server, db = "ncv-dev2", "pubs"
    usr, passwd = "sa", ""
    driver = "com.inet.tds.TdsDriver"
    port = 1433
    url = "jdbc:inetdae:" + server + ":" + `port` + "?database=" + db
    java.lang.Class.forName(driver).newInstance()
    conn = java.sql.DriverManager.getConnection(url, usr, passwd)
    query = "select title, price, ytd_sales, pubdate from titles"
    stmt = conn.createStatement()
    if stmt.execute(query):
        rs = stmt.getResultSet()
        while rs and rs.next():
            out.println(rs.getString("title"))
            if rs.getObject("price"):
                out.println("%2.2f" % rs.getFloat("price"))
            else:
                out.println("null")
            if rs.getObject("ytd_sales"):
                out.println(rs.getInt("ytd_sales"))
            else:
                out.println("null")
            out.println(rs.getTimestamp("pubdate").toString())
            out.println()
    stmt.close()
    conn.close()

----- Original Message -----
From: "Brian Zhou" <bri...@ya...>
To: <jyt...@li...>
Cc: <jyt...@li...>
Sent: Wednesday, January 31, 2001 9:34 AM
Subject: [Jython-users] servlet problem self.getInitParameterNames()
under PyServlet wrapper


> Hello list,
>
> Following http://groups.yahoo.com/group/jpython/message/3714 I
succeeded
> making servlet running under PyServlet wrapper/handler on win2k
tomcat3.2.1.
> So far so good, I can run simple script like:
>
> import sys, java, javax
>
> class hello(javax.servlet.http.HttpServlet):
>    def doGet(self, req, res):
>       res.setContentType("text/html");
>       out = res.getOutputStream()
>       out.println("""\
> <html>
> <head><title>Hello World</title></head>
> <body>Hello World!
> <P>
> current server time is: %s
> </P>
> </body>
> </html>
> """ % (java.util.Date()))
>       out.close()
>       return
>
> Or even dynamicly generate PNG graph thanks to the new javax.imagio
package
> from Sun. I don't expect any difficulty hooking up with database using
JDBC.
>
> However, when trying to port SnoopServlet from java to jython, I found
that
> PyServlet really doesn't handover any instant variables to the jython
> HttpServlet subclass except (request, response). So
>
>     enum = self.getInitParameterNames()
>
> will got a NullPointerException. Any operation involve self.attribute
like
> self.getServletContext() will also fail. I don't think jythonc
compiled
> classes will have this problem because the jython servlet handle
service()
> directly bypassing PyServlet.
>
> So my questions are:
>
> 1. Am I missing anything? Any misunderstanding of the API?
> 2. Any way around? Anyone got a better PyServlet?
> 3. If I'm the first one got bitten, any idea how we may overcome this
> problem?
>
> Seeing the power of dynamic python scripting at work (instant feedback
> without re-compiling), I really appreciate what have been done so far,
and
> want to get it going. Here are some of my ideas:
>
> 1. We can have two seperate subclasses of HttpServlet in java:
>     one possibly named ServletPyHandler, doing what PyServlet
currently is
> doing, dispatching service() calls to jython servlet;
>     the other JyServlet being superclass of all jython servlets, with
> constructor JyServlet(ServletPyHandler), so JyServlet always has a ref
to
> the ServletPyHandler instance;
> The downside of this approach is that now jythonc compiled servlet and
> dynamically interpreted servlet have to be written differently.
>
> 2. Have ServletPyHandler do somthing to the jython servlet class right
> before dispatching service() call, so that inside jython servlet,
later when
> messages like  self.getInitParameterNames() will be redirected back to
> ServletPyHandler.
>
> TIA for any ideas,
>
> /Brian
>
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
>

[Jython-dev] 'ababab'.count() bug

[Ype K. <yk...@xs...>]

Dear developers,

Tried to report this via soureforge but the bugid bug
is still there.
In jython 2.0 a3 I have this:

'aaa'.count('a',0,2) == 2, ok, and

'ababab'.count('ab',0,5) == 3, should be 2 (CPython also gives 2).

'defdefdef.count('def',0,8) == 3, should also be 2.

Using blackdown java 1.3, powerpc, no jit.

You might want to add sth like this to test_string.py,
count() is untested there:

  test('count', 'aaa', 3, 'a')
  test('count', 'aaa', 2, 'a', 0, 2)
  test('count', 'ababab', 3, 'ab', 0)
  test('count', 'ababab', 2, 'ab', 0, 5)
  test('count', 'ababab', 2, 'ab', 1)
  test('count', 'ababab', 2, 'ab', 1, 6)
  test('count', 'ababab', 0, 'abc')
  test('count', 'ababab', 0, '')

Good luck, thanks for your time,
Ype

Patch against PyString.java (the first bit is only for speeding up a little,
I have to say though that it has not even been compiled):

1045,1048c1045,1048
<         if (end < 0) {
<             end += n;
<         } else if (end > n)
< 	    end = n;
---
>         if (end < 0)
>             end = n+end;
>         if (end > n)
>             end = n;
1053c1053
<         int lastcheck = end - slen;
---
>         //end = end-slen;
1056c1056
<         while (start <= lastcheck) {
---
>         while (start < end) {
1058c1058
<             if (index == -1)
---
>             if (index >= end || index == -1)

[Jython-dev] ann: jreload doc online

[Samuele P. <pe...@in...>]

Some documentation about the java reload (experimental) simple support -
that comes with jython 2.0 - is now available online:

  http://www.jython.org/docs/jreload.html

We encourage everybody interested in java class reloading from jython,
to read the doc and to try 'jreload'.

Feedback (to jython-dev) and bug reports are welcome.

The jreload.py file that comes with jython 2.0 contains a little typo
(actual CVS version has been fixed):

--- jreload.typo	Thu Feb  1 15:14:43 2001
+++ jreload.py	Thu Feb  1 15:13:12 2001
@@ -84,7 +84,7 @@
     return _Unload(ls)
 
 def makeLoadSet(name,path):
-    if sys.modules.has_key('name'): return sys.modules[name]
+    if sys.modules.has_key(name): return sys.modules[name]
     sys.modules[name] = ls = LoadSet(name,path)
     return ls

Thanks to Thomas Breuel for reporting this.

Cheers,
      the jython-developers 

PS: the cited example files are now in the CVS tree.
  

[Jython-dev] Using Jython for applet programming

[±è»ó¿µ <reb...@ha...>]

Dear Sir.

I have a question about applet programming with jython.=20

I make a sample program as you know that just print=20

"hello world"

It works well on jython.

but, It donesn't work that compiled with jythonc.

It just display gray square box in explorer.

It's very simple applet program..

I also tested that sample code in your homepage.

However, the result is same..

I compile the program like that

jython --core --d --jar hello.jar hello.py

my enviroment :

windows 98 / 2000=20
pentium 3 700
jdk 1.3.0_01
jython 2.0

How can I do for that?



=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=BF=EC=B8=AE =C0=CE=C5=CD=B3=DD, Daum
=C6=F2=BB=FD =BE=B2=B4=C2 =B9=AB=B7=E1 E-mail =C1=D6=BC=D2 =C7=D1=B8=DE=C0=
=CF=B3=DD
=C1=F6=B1=B8=C3=CC =C7=D1=B1=DB =B0=CB=BB=F6=BC=AD=BA=F1=BD=BA Daum FIREB=
ALL
http://www.daum.net

Re: [Jython-dev] jreload doc

[Samuele P. <pe...@in...>]

Hi.

> You can add it as ./Doc/jreload.ht. The links to the demo sources should
> not contain any path, eg: <a href="Version.java">. The built script for
> the Doc directory can then ensure that lastest version from Demo is used
> when the documentation is generated for both local installation and the
> web site.
Done.

I don't know if is the case to add links to this from the main doc index file:
* simple java classes reload (experimental) support => jreload.html
* java classes unloading and internalTablesImpl option => jreload.html#unload

regards, Samuele Pedroni.

[Jython-dev] Jython console under Tru64 Unix

[Adam B. <ada...@gb...>]

I'm posting this to the list because the bug report page gives me: =
error
getting bug_id all the time.
"

Odd problem.  Jython console started with no parameters fails with an
"IOError - File not found -".  However the problem goes away when the
interpreter is started with a script param or started with the -v =
option.

Compaq Tru64 Unix
uname -a
OSF1 supanova V4.0 1229 alpha=20

Trace / config

prompt>jython
Traceback (innermost last):
  (no code object) at line 0
IOError: File not found -  (No such file or directory)
supanova /usr/users/supastar/gway/bin =3D> jython -v
import: 'exceptions' as org.python.core.exceptions in builtin modules
Jython 2.0 on java1.2.2-1 (JIT: jit_122)
import: 'site' as /usr/local/jython-20/Lib/site.py
import: 'sys' as sys in builtin modules
import: 'os' as org.python.modules.os in builtin modules
import: 'javaos' as /usr/local/jython-20/Lib/javaos.py
import: 'java' as java package
import: 'File' as java class
import: 'javapath' as /usr/local/jython-20/Lib/javapath.py
import: 'System' as java class
import: 'sitecustomize' not found (ImportError)
Type "copyright", "credits" or "license" for more information.
>>> ^D
supanova /usr/users/supastar/gway/bin =3D> java -fullversion
java full version "J2SDK.v.1.2.2:09/30/1999-19:00"
supanova /usr/users/supastar/gway/bin =3D> whence java
/usr/opt/java122/bin/java
supanova /usr/users/supastar/gway/bin =3D> java -version
java version "1.2.2-1"
Classic VM (build J2SDK.v.1.2.2:09/30/1999-19:00, native threads, =
jit_122) =20

I've also tried it with jdk118 on this platform.  I only see the =
problem on
this platform.  It looks like the "-" convention for stdin is not being
recognised.  I should be able test patches / configuration changes /
suggestions if you don't have access to this env, though I haven't got =
a lot
of time to give to it.  Any suggested starting points?


--
Adam Burke
www.gbst.com
=BA The document is also available in oil-based toner on flattened
dead trees by sending US$10 (or equivalent) to the editor (email
first to check currency and postal address).
    -- Frequently Asked Questions about the Extensible Markup Language,

[Jython-dev] servlet problem self.getInitParameterNames() under PyServlet wrapper

[Brian Z. <bri...@ya...>]

Hello list,

Following http://groups.yahoo.com/group/jpython/message/3714 I succeeded
making servlet running under PyServlet wrapper/handler on win2k tomcat3.2.1.
So far so good, I can run simple script like:

import sys, java, javax

class hello(javax.servlet.http.HttpServlet):
   def doGet(self, req, res):
      res.setContentType("text/html");
      out = res.getOutputStream()
      out.println("""\
<html>
<head><title>Hello World</title></head>
<body>Hello World!
<P>
current server time is: %s
</P>
</body>
</html>
""" % (java.util.Date()))
      out.close()
      return

Or even dynamicly generate PNG graph thanks to the new javax.imagio package
from Sun. I don't expect any difficulty hooking up with database using JDBC.

However, when trying to port SnoopServlet from java to jython, I found that
PyServlet really doesn't handover any instant variables to the jython
HttpServlet subclass except (request, response). So

    enum = self.getInitParameterNames()

will got a NullPointerException. Any operation involve self.attribute like
self.getServletContext() will also fail. I don't think jythonc compiled
classes will have this problem because the jython servlet handle service()
directly bypassing PyServlet.

So my questions are:

1. Am I missing anything? Any misunderstanding of the API?
2. Any way around? Anyone got a better PyServlet?
3. If I'm the first one got bitten, any idea how we may overcome this
problem?

Seeing the power of dynamic python scripting at work (instant feedback
without re-compiling), I really appreciate what have been done so far, and
want to get it going. Here are some of my ideas:

1. We can have two seperate subclasses of HttpServlet in java:
    one possibly named ServletPyHandler, doing what PyServlet currently is
doing, dispatching service() calls to jython servlet;
    the other JyServlet being superclass of all jython servlets, with
constructor JyServlet(ServletPyHandler), so JyServlet always has a ref to
the ServletPyHandler instance;
The downside of this approach is that now jythonc compiled servlet and
dynamically interpreted servlet have to be written differently.

2. Have ServletPyHandler do somthing to the jython servlet class right
before dispatching service() call, so that inside jython servlet, later when
messages like  self.getInitParameterNames() will be redirected back to
ServletPyHandler.

TIA for any ideas,

/Brian

Re: [Jython-dev] jreload doc

[<bc...@wo...>]

[Samuele]

>I'm posting a preliminary *draft* version of some documentation for java reload
>simple support module - jreload, which
>is still experimental.
>
>Is it possible to understand what is explained? Is that too technical? or more
>details are needed?
>(English is too bad?)

I'm hardly in a position to offer critique on correct usage of the
english language, but I found a single sentences I couldn't parse:

>Note: Unless one cannot predict the amount of reloading that will be 
>performed by an application or for the case of long-running highly 
>dynamic apps, the unloading issue can simply be ignored. 

I could understand everything else. 

You can add it as ./Doc/jreload.ht. The links to the demo sources should
not contain any path, eg: <a href="Version.java">. The built script for
the Doc directory can then ensure that lastest version from Demo is used
when the documentation is generated for both local installation and the
web site.

regards,
finn

[Jython-dev] jreload doc

[Samuele P. <pe...@in...>]

Hi.

I'm posting a preliminary *draft* version of some documentation for java reload
simple support module - jreload, which
is still experimental.

Is it possible to understand what is explained? Is that too technical? or more
details are needed?
(English is too bad?)

Comments, suggestions and corrections will be appreciated.

Thanks, Samuele Pedroni.

PS: it contains also some useful (related info) on
python.options.internalTablesImpl!
PS: jreload 0.2 contains a stupid typo, that will be fixed and distributed
somehow...
PS: The idea is that this doc will end up in the distributed jython docs
(<jython-home>/Doc)
and possibly on jython site. The version I'm posting is plain html, the final
version will be a .ht template.
PS: The doc refers to an example, it is ready too and should end up as "Demo"
in jython distr.

Re: [Jython-dev] Jython support for JDK/JRE 1.3 on Windows & Solaris

[Robert W. B. <rb...@di...>]

On Tue, 30 Jan 2001, Mike Snell wrote:
> I'm preparing to do development using Jython with target platforms of
> Windows 2000 and Solaris.
>
> My concern is Jython's seeming lack of explicit support for JDK/JRE 1.3
> (at least according to http://www.jython.org/platform.html
> <http://www.jython.org/platform.html> )

An omission on my part- sorry.  JVM 1.3 has been tested on Solaris 8 since
Finn was kind enough to add the -o switch (I think that was rc1 or
earlier)-- Thanks Finn!  However, I forgot to include this info with my
other Solaris test info.

* "Tested" means regrtest.py (modified for Jython) and all the scripts I
had at the time worked.

> Anyone have any experience or guidance for these JVM/OS combiniations.

Yes on the Solaris 8- all good news.

> What about JPython 1.1?  Anyone used it successfully with 1.3 on these
> platforms?

JPython1.1 is not recommended, and unnecessary as Jython
+ jvm1.3 + Solaris 8 is OK.

-Robert

Re: [Jython-dev] Jython support for JDK/JRE 1.3 on Windows & Solaris

[Samuele P. <pe...@in...>]

Hi.

> I'm preparing to do development using Jython with target platforms of
> Windows 2000 and Solaris.
>  
> My concern is Jython's seeming lack of explicit support for JDK/JRE 1.3
> (at least according to http://www.jython.org/platform.html
> <http://www.jython.org/platform.html> )
The page is simply not up to date, I think because of lack of feedbacks.
I think you are referring to jdk 1.3 under Solaris.
Because for Windows jdk1.3 is already indicated as the first choice

I assume that up to strange quality problem of the type that jdk1.3
for solaris contains much more bugs than jdk1.3 for Windows, jdk 1.3 
as platform (that should behave uniformely across os'es) is an adequate home
for jython.
I have done my entire part of contribution to jython mostly under jdk 1.3.

In general if jython encounters a bug that does not appear on all
jvms that's jvm bug per definition.

In general jpython encountered such kind of bugs under browser jvm
and old jvms with JITs. They were both some kind of 1st,2nd generation
jvm.
First JITs have a lot of robustness issues, and the very dynamic nature
of jython (wrt. class loading, reflection) stressed them.

My experience and technical reasons indicate that the jdk1.3 jvm
is more robust. One of its goal is too completely hide the native
compilation that happens behind the scenes: externally e.g.
you get line numbers for exceptions in compiled code too.
Another nice feature is e.g. that System.gc force collection
of unloadable classes too.

The porting to different os'es of this cannot break everything at once.

So I encourage you to try jdk 1.3 also under Solaris and any feedback
from that will be appreciated.

On the other hand JPython 1.1 is really not a solution.
A lot of bugs have been fixed and much improvents have been done between
that and jython 2.0.

regards, Samuele Pedroni.

RE: [Jython-dev] Jython support for JDK/JRE 1.3 on Windows & Solaris

[Brian Z. <bz...@ig...>]

For what it's worth, I use Jython 2.0 on JDK 1.3 on Win2K and have not
noticed a single problem related to the VM.

brian

-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of Mike Snell
Sent: Tuesday, January 30, 2001 9:35 AM
To: jyt...@li...
Subject: [Jython-dev] Jython support for JDK/JRE 1.3 on Windows &
Solaris


I'm preparing to do development using Jython with target platforms of
Windows 2000 and Solaris.
=20
My concern is Jython's seeming lack of explicit support for JDK/JRE 1.3
(at least according to http://www.jython.org/platform.html
<http://www.jython.org/platform.html> )
=20
Anyone have any experience or guidance for these JVM/OS combiniations.
=20
What about JPython 1.1?  Anyone used it successfully with 1.3 on these
platforms?
=20
Thanx,
Mike

_______________________________________________
Jython-dev mailing list
Jyt...@li...
http://lists.sourceforge.net/lists/listinfo/jython-dev

[Jython-dev] Jython support for JDK/JRE 1.3 on Windows & Solaris

[Mike S. <MS...@em...>]

I'm preparing to do development using Jython with target platforms of
Windows 2000 and Solaris.
=20
My concern is Jython's seeming lack of explicit support for JDK/JRE 1.3
(at least according to http://www.jython.org/platform.html
<http://www.jython.org/platform.html> )
=20
Anyone have any experience or guidance for these JVM/OS combiniations.
=20
What about JPython 1.1?  Anyone used it successfully with 1.3 on these
platforms?
=20
Thanx,
Mike