Re: [Jython-users] import failures of core java libraries with Jython 2.2.1

[<cl...@br...>]

Dear Chris, 

I often use this is  classPathHacker code when some Java classes are not 
loading correctly through the standard Jython class loader 
and   sys.path.append("...")  statement. 

Try this: 

import sys
from org.python.util import PythonObjectInputStream
from org.python.core import *
from java.net import *
from java.io import *
from java.lang import * 
sysProp = System.getProperties()
userdir = sysProp.getProperty("user.dir")
userdir = userdir.replace("\\", "/") 
try: 
    # dynamically adds CLASSPATH for Java Class Loader
    myclassloader = classPathHacker() 
    url_a = myclassloader.addFile(userdir + 
"/some_package_path/some_package.jar")
except Exception, e:
   print ("ClassPathHacker Load .jar Error:" + str(e)) 

import Java stuff now..


The class file: 

import java.lang.reflect.Method
from java.io import File as javaFile
from java.net import URL 
from java.net import URLClassLoader
from java.lang import Class as javaClass
from java.lang import ClassLoader as javaClassLoader
from java.lang import Object as javaObject
from java.lang import System
import jarray

class classPathHacker():
 
    def __init__(self):
        # init actions
        self.DEBUG = 0 
        pass 

    def addURL (self, u):
        DEBUG = 0 
        ##################################
        # Purpose: Call this with u= URL for
        #       the new Class/jar to be loaded
        ################################# 
        parameters = jarray.array([URL], javaClass)
        sysloader =  javaClassLoader.getSystemClassLoader()
        sysclass = URLClassLoader
        method = sysclass.getDeclaredMethod("addURL", parameters)
        a = method.setAccessible(1)
        jar_a = jarray.array([u], javaObject)
        if DEBUG: print ("jar added is : " + str(jar_a))
        b = method.invoke(sysloader, jar_a)
        sysProp = System.getProperties()
        if DEBUG: print ("------- Resulting CLASSPATH modified by 
classPathHacker-------" + "\n") 
        if DEBUG: print (sysProp.getProperty("java.class.path"))
        return u
 
    def addFile (self, s):
        #############################################
        # Purpose: If adding a file/jar call this first
        #       with s = path_to_jar
        #############################################
        # make a URL out of 's'
        f = javaFile(s)
        u = f.toURL()
        a = self.addURL(u)
        return a 
 
    if __name__ == "__main__":
        DEBUG = 0 
        if DEBUG: print "callPathHacker is active"
 

Regards, 
Claude

Claude Falbriard 
Certified IT Specialist L2 - Middleware
AMS Hortolândia / SP - Brazil
phone:    +55 13 9760 0453
cell:         +55 13 8117 3316
e-mail:    cl...@br...




From:   Chris Clark <Chr...@ac...>
To:     Jyt...@li...
Date:   02/02/2012 21:57
Subject:        [Jython-users] import failures of core java libraries with 
Jython  2.2.1



I've discovered an odd Jython 2.2.1 specific problem, importing java.sql 
or java.awt fails.

Jython 2.2rc1 doesn't seem to have this problem (at least for java.sql).

Jython 2.5.2 works fine for both too.

I breifly tried to use 
org.python.core.JavaImporter().load_module('java.sql'), whilst this 
doesn't error, it doesn't seem to offer access to those libs.

The awt problem appears to show a bug with the "pawt" package that is 
shipped with Jython.

Any ideas? Any workarounds or tips on how to use JavaImporter?

Sometimes it is possible to "import java" and then access "java.sql", 
etc. but this doesn't work here either.

Here is a sample session from a Windows 7 machine:

    C:\jython2.2.1>java -jar jython.jar
    Jython 2.2.1 on java1.6.0_21
    Type "copyright", "credits" or "license" for more information.
     >>> import java
     >>> import java.sql
    Traceback (innermost last):
       File "<console>", line 1, in ?
    ImportError: no module named sql
     >>> import java.math
     >>> import java.lang
     >>> import java.util
     >>> import java.awt
    Traceback (innermost last):
       File "<console>", line 1, in ?
    ImportError: no module named awt
     >>> import pawt
    Traceback (innermost last):
       File "<console>", line 1, in ?
       File "C:\jython2.2.1\jython.jar\Lib/pawt/__init__.py", line 2, in ?
    ImportError: cannot import name awt


Chris


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