jython-users

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

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

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.
> 
> I have this simple python file named test.py:
> 
> import java.lang
> print 'java.lang:',dir(java.lang)
> 
> If I compile it with Jythonc I don't get expected result
> 
> c:\Document\Test>jythonc --jar test.jar -c test.py
> :
> c:\Document\Test>java -jar test.jar test
> java -jar test.jar test
> java.lang: ['__name__']
> 
> 
> But if I use the interpreter I get the expected result.
> 
> c:\Document\Test>jython test.py
> jython test.py
> java.lang: ['AbstractMethodError', 'ArithmeticException',
> 'ArrayIndexOutOfBoundsException', 'ArrayStoreException', 'Boolean', 'Byte',
> 'Character', 'Class', 'ClassCastException', 'ClassCircularityError',
> 'ClassFormatError', 'ClassLoader', 'ClassNotFoundException',
> 'CloneNotSupportedException', 'Cloneable', 'Comparable', 'Compiler',
> 'Double', 'Error', 'Exception', 'ExceptionInInitializerError', 'Float',
> 'IllegalAccessError', 'IllegalAccessException', 'IllegalArgumentException',
> 'IllegalMonitorStateException', 'IllegalStateException',
> 'IllegalThreadStateException', 'IncompatibleClassChangeError',
> 'IndexOutOfBoundsException', 'InheritableThreadLocal', 'InstantiationError',
> 'InstantiationException', 'Integer', 'InternalError',
> 'InterruptedException', 'LinkageError', 'Long', 'Math',
> 'NegativeArraySizeException', 'NoClassDefFoundError', 'NoSuchFieldError',
> 'NoSuchFieldException', 'NoSuchMethodError', 'NoSuchMethodException',
> 'NullPointerException', 'Number', 'NumberFormatException', 'Object',
> 'OutOfMemoryError', 'Package', 'Process', 'Runnable', 'Runtime',
> 'RuntimeException', 'RuntimePermission', 'SecurityException',
> 'SecurityManager', 'Short', 'StackOverflowError', 'StrictMath', 'String',
> 'StringBuffer', 'StringIndexOutOfBoundsException', 'System', 'Thread',
> 'ThreadDeath', 'ThreadGroup', 'ThreadLocal', 'Throwable', 'UnknownError',
> 'UnsatisfiedLinkError', 'UnsupportedClassVersionError',
> 'UnsupportedOperationException', 'VerifyError', 'VirtualMachineError',
> 'Void', '__name__', 'ref', 'reflect']
> c:\Document\Test>
> 
> 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.

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

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

Hi.

Seems that a lot of people ignore this but java -jar
does not use the classpath settings, the jar should be
self-contained. This is unrelated to jython <wink> 
(on the other hand - I think - extensions (in java sense) are considered)

http://java.sun.com/j2se/1.3/docs/tooldocs/linux/java.html#-jar

regards.

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

[Frode R. <fro...@er...>]

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.
>