Re: [Jython-users] Different result in interpreter and when compiled with Jythonc

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Hi again,

I try with a new example and below you can see the log. I am using
Jython2.1a1. If I remove the from ... Import then I get a "AtributeError
java package 'datarep.common' has no attribute 'Spacer'". If someone want to
try with the datarep_common.jar you can either download Simplicity or send
me a mail so I can send it off list.

============  Log start ============
c:\Document\PaaceTest>type test.py
type test.py
import java,javax,datarep.common

from datarep.common import Spacer

class testClass:
    def __init__(self):
        self.Spacer = datarep.common.Spacer(5,5)

t=testClass()
print t.Spacer
c:\Document\PaaceTest>jython test.py
jython test.py
datarep.common.Spacer[,0,0,5x5,invalid]
c:\Document\PaaceTest>java -jar test.jar -c test.py
java -jar test.jar -c test.py
Java Traceback:

    at org.python.core.Py.ImportError(Py.java:180)
    at org.python.core.imp.importFromAs(imp.java:593)
    at test$_PyInner.main$3(test.java:61)
    at test$_PyInner.call_function(test.java:38)
    at org.python.core.PyTableCode.call(PyTableCode.java:198)
    at org.python.core.PyCode.call(PyCode.java:13)
    at org.python.core.imp.createFromCode(imp.java:165)
    at org.python.core.Py.runMain(Py.java:818)
    at test.main(test.java:80)
Traceback (innermost last):
  File "C:\Document\PaaceTest\test.py", line 0, in main
ImportError: cannot import name Spacer

c:\Document\PaaceTest>jythonc -jar test.jar -c test.py
jythonc -jar test.jar -c test.py
Warning: -jar is deprecated, use --jar
processing test

Required packages:
  javax
  java
  datarep.common

Creating adapters:

Creating .java files:
  test module

Compiling .java to .class...
Compiling with args: ['c:\\tools\\jdk130\\bin\\javac', '-classpath',
'"C:\\tools\\Jython\\Jython21a1\\jython.jar;.;C:\\tools\\SimplicityProfessio
nal\\pbclient31RE.jar;C:\\tools\\SimplicityProfessional\\pbnetwork31RE.jar;C
:\\tools\\SimplicityProfessional\\datarep_common.jar;.\\jpywork;;C:\\tools\\
Jython\\Jython21a1\\Tools\\jythonc;c:\\Document\\PaaceTest\\.;C:\\tools\\Jyt
hon\\Jython21a1\\Lib;C:\\tools\\Jython\\Jython21a1"',
'.\\jpywork\\test.java']
0  Note: Some input files use or override a deprecated API.
Note: Recompile with -deprecation for details.

Building archive: test.jar
Tracking java dependencies:
c:\Document\PaaceTest>java -jar test.jar test
java -jar test.jar test
Java Traceback:

    at org.python.core.Py.ImportError(Py.java:180)
    at org.python.core.imp.importFromAs(imp.java:593)
    at test$_PyInner.main$3(test.java:57)
    at test$_PyInner.call_function(test.java:36)
    at org.python.core.PyTableCode.call(PyTableCode.java:198)
    at org.python.core.PyCode.call(PyCode.java:13)
    at org.python.core.imp.createFromCode(imp.java:165)
    at org.python.core.Py.runMain(Py.java:818)
    at test.main(test.java:74)
Traceback (innermost last):
  File "C:\Document\PaaceTest\test.py", line 0, in main
ImportError: cannot import name Spacer

c:\Document\PaaceTest>jar -tf
c:\tools\SimplicityProfessional\datarep_common.jar
jar -tf c:\tools\SimplicityProfessional\datarep_common.jar
META-INF/MANIFEST.MF
datarep/
datarep/common/
datarep/common/AbsoluteLayout.class
datarep/common/ApplicationAudioClip.class
datarep/common/BottomLayout.class
datarep/common/Calculator.class
datarep/common/Calculator$Lexer.class
datarep/common/Calculator$Cpu.class
datarep/common/CalculatorTest.class
datarep/common/CloseListener.class
datarep/common/Email.class
datarep/common/Flyer.class
datarep/common/FlyoutHelpManager.class
datarep/common/FrameAnimator.class
datarep/common/GBConstraints.class
datarep/common/GroupBoxPanel.class
datarep/common/HeavyGroupBoxPanel.class
datarep/common/Helpable.class
datarep/common/HelpTest.class
datarep/common/ImageButton.class
datarep/common/ImageCanvas.class
datarep/common/ImageHandler.class
datarep/common/JarUtil.class
datarep/common/LeftSideLayout.class
datarep/common/MessageBox.class
datarep/common/ProgressBar.class
datarep/common/Sizer.class
datarep/common/Spacer.class
datarep/common/TabbedCardPanel.class
datarep/common/TemplateProcessor.class
datarep/common/TemplateProcessor$Node.class
datarep/common/TextPrinter.class
datarep/common/Util.class
datarep/common/ValidatedTextField.class
datarep/common/WrapLabel.class
datarep/common/database/
datarep/common/database/QueryTableModel.class
datarep/common/database/QueryListModel.class
datarep/common/database/QueryComboBoxModel.class
datarep/common/database/ColumnMapping.class
datarep/common/database/InputMapping.class
datarep/common/database/ActionMapping.class
datarep/common/database/SelectionMapping.class
datarep/common/database/Mapping.class
datarep/common/database/Query.class
datarep/common/database/QueryList.class
datarep/common/database/Command.class
datarep/common/database/DatabaseManager.class
datarep/common/database/DatabaseManager$SelectionCommandListener.class
datarep/common/database/DatabaseManager$ActionCommandListener.class

c:\Document\PaaceTest>echo %classpath%
echo %classpath%
.;C:\tools\SimplicityProfessional\pbclient31RE.jar;C:\tools\SimplicityProfes
sional\pbnetwork31RE.jar;C:\tools\SimplicityProfessional\datarep_common.jar

c:\Document\PaaceTest>

============  Log end ============

> Hi.
> 
> [Frode Reinsnes]
>> I have used Jython for a while, but I haven't use Jythonc before. So I think
>> I have miss something, but are not able to se what.
:
: First example removed because Samuele Pedroni explain it.
:
>> I am running on Windows 2000 with Sun's JDK 1.3.0. Have I miss some thing?
>> 
>> I wrote this test file because I have develop a application and used the
>> interpreter in the debugging phase. Then I want to compile it before I send
>> it to external test. But when I compile it with Jythonc and try to run it
>> complain about a class in a java library don't exist.
> 
> The std jython interpreter at initialitation time (for jars and dirs)
> and at runtime (for dirs) gathers info about java packages and the their
> classes (the info about jars is also cached), so a 'dir' correctly reports
> all classes in a package.
> 
> The runtime when running jythonc compiled code does not gather such info
> (so to be on the safe side for the applet case), on the other hand
> the runtime needs to know java packages names to deals with imports properly:
> jythonc tries to gather the names of used packages when compiling the program
> (through a minimal form of partial evaluation) and store them in the produced
> classes but without the complete list of the classes in a package (this is not
> really needed and could be slightly different at execution time), so the
> empty 'dir' results (only actually imported classes will appear there).
> 
> About the class not found problem:
> - a missing 'import' hint
> - the program was compiled under a classpath that does not contain
> all the classes needed at runtime, so jythonc fails to guess that something
> is actually a java package
> (yes, roughly jythonc should be executed with a classpath that offers all the
> classes that the program will need at runtime)
> - a problem with classloaders (these are hard to debug and one
> should knows what comes from where)
> ... and other possibilities that I don't remember .
> 
> regards, Samuele Pedroni.
> 