Re: jcc dll loading error

Mon, 28 May 2012 10:11:25 -0700 


On Mon, 28 May 2012, Mark Finkelstein wrote:


Thank you, the examples work great! I was able to get basic functionality
going, but when I tried to wrap a different jar file I got the following
exception:

jcc.cpp.JavaError: java.lang.ExceptionInInitializerError
Java stacktrace:
java.lang.ExceptionInInitializerError
Caused by: java.lang.NullPointerException
       at org.micromanager.utils.ImageUtils.<clinit>(ImageUtils.java:23)
JCC uses Java's reflection API to determine the signatures of methods to wrap. Thus, it needs to load all classes it processes.
This particular class has a static initializer that is failing. You need to look at that static initializer's code and modify it so that plainly loading the class can work. Currently, something else is needed by this class at load time that JCC cannot provide. Maybe it's possible to pass some extra command line arguments, maybe you need to change its code to let that null pointer pass for the sake of being able to plainly load this class like JCC is trying to to.
For example, wrapping AWT classes fails in a similar way and there is a command line flag to work that around (and it is passed to the JVM by JCC by default, -Djava.awt.headless=true). 


There's actually one class that I really want to wrap, it's located in a
jar file that I have in my classpath. I have also tried using --package
org.micromanager, since this is the package the class resides in, but it
seems as if this gets ignored.
Having a class on your classpath is not enough to have it wrapped by JCC. You need to put its classname onto the JCC command line or pass its jar file with --jar. --package is different. It is used to wrap dependent classes found in the signatures of methods of classes you explicitely asked to have wrapped. Without --package, these methods would be skipped instead.
Run the command below to get more details about all of JCC's command line arguments: 

 $ python -m jcc.__main__


Right now the command I'm using is:

C:\Users\avastmatey>python -m jcc.__main__ --find-jvm-dll --package
java.lang --package java.util --package java.io --jar "C:\Program
Files\Micro-Manager-1.4\plugins\Micro-Manager\MMCoreJ.jar" --jar
"C:\Program
Files\Micro-Manager-1.4\plugins\Micro-Manager\MMJ_.jar" --classpath
%CLASSPATH% --python CMMCore3 --version 2.6 --build --compiler msvc
--install

where MMJ_ is the jar which contains the class I would like to wrap. I
think that the other classes in this jar are perhaps stopping this from
happening? I tried to extract this jar, but got a bunch of classes with
$1.class at the end, which I dont think represent the class I would like to
wrap.
So you are explicitely requesting with via --jar. Good. Thus it must be wrapped. How do you determine that it's not being wrapped ? Because of missing methods ? Look at their signatures and be sure that all classes they mention at least be listed via their package with --package.
$1.class class names are due to anonymous inner classes in your classes. This is a normal Java thing, nothing to do with JCC. 

Andi..



Many thanks!

Mark.

On Sun, May 27, 2012 at 8:18 PM, Andi Vajda <va...@apache.org> wrote:



On May 27, 2012, at 6:30, Mark Finkelstein <finkel.m...@gmail.com> wrote:


That solved it; I worked through and set up everything to work

consistently

with msvc. It now compiles, but I'm having trouble finding any good jcc
examples. I tried the following:


Take a look at PyLucene test cases and examples.


import jcc


Not necessary. Only used for building your extension. Especially if you
didn't build your extension with --shared mode.


import CMMCore3

vm=jcc.initVM()


Use CMMCore3.initVM() instead.


vm.attachCurrentThread()


Not necessary from main thread.


print vm.isCurrentThreadAttached()

core=CMMCore3.CMMCore() # this is the jcc wrapped class


It prints out True, but immediately afterwards gives out the
error: RuntimeError: initVM() must be called first


Because your extension isn't initialized as you didn't call initVM() on it
(but on jcc instead).


Which leads me to assume that the vm intialization is not global, which
seems contrary to the description?


It is global (there can only be one Java VM instantiated per process) but
must be called on your extension, not jcc.

Andi..


Again, many thanks for the amazing support!

Mark.

On Sun, May 27, 2012 at 1:42 AM, Bill Janssen <jans...@parc.com> wrote:


Andi Vajda <va...@apache.org> wrote:



On Sat, 26 May 2012, Mark Finkelstein wrote:


That solved it; apparently it wasnt using the CLASSPATH variable to

get

this information, but specifying it directly solved this. Hopefully

this

will be one of the last errors; after pushing forward, I found myself

C:\MinGW\bin\gcc.exe -mdll -O -Wall -DPYTHON -DJCC_VER="2.13"
-D_java_generics -IX:\Java16/include -IX:\Java16/include/win32
-Ibuild\_CMMCore2 -IC:\Python26\lib\site-packages\jcc\sources
-IC:\Python26\include -IC:\Python26\PC -c build\_CMMCore2\CMMCore2.cpp

-o

build\temp.win32-2.6\Release\build\_cmmcore2\cmmcore2.o /EHsc
/D_CRT_SECURE_NO_WARNINGS
gcc: error: /EHsc: No such file or directory
gcc: error: /D_CRT_SECURE_NO_WARNINGS: No such file or directory
error: command 'gcc' failed with exit status 1

Perhaps this is more meant for a cygwin installation, but is there a

way to

make this work for the cmd prompt?


You've configured JCC to work with a Microsoft Visual C++ compiler but
you're using gcc via MinGW. I can't help you with that configuration
as I don't have it but MinGW has been used with JCC before and someone
on this list should be able to help you.


Yes, consistency is important here.  Those flags (/EHsc and
/D_CRT_SECURE_NO_WARNINGS) look like Microsoft compiler directives to
me, and won't work with GCC.

In case it's of help, this is my build script for mingw and JCC 3.x.
I haven't tried this recently, but it should still work.

Bill

export JCC_ARGSEP=";"
export JCC_JDK="$WINSTYLEJAVAHOME"
export JCC_CFLAGS="-fno-strict-aliasing;-Wno-write-strings"
export JCC_LFLAGS="-L${WINSTYLEJAVAHOME}\\lib;-ljvm"
export


JCC_INCLUDES="${WINSTYLEJAVAHOME}\\include;${WINSTYLEJAVAHOME}\\include\\win32"

export JCC_JAVAC="${WINSTYLEJAVAHOME}\\bin\\javac.exe"
${python} setup.py build --compiler=mingw32 install
--single-version-externally-managed --root /c/ --prefix="${distdir}"
if [ -f jcc/jcc.lib ]; then
cp -p jcc/jcc.lib "${sitepackages}/jcc/jcc.lib"
fi
# for 3.x compiled with MinGW GCC 4.x and "--shared", we also need two
# GCC libraries
if [ -f /mingw/bin/libstdc++-6.dll ]; then
install -m 555 /mingw/bin/libstdc++-6.dll "${distdir}/bin/"
echo "copied libstdc++-6.dll"
fi
if [ -f /mingw/bin/libgcc_s_dw2-1.dll ]; then
install -m 555 /mingw/bin/libgcc_s_dw2-1.dll "${distdir}/bin/"
echo "copied libgcc_s_dw2-1.dll"
fi




You might want to search the list archives, this question has come up
before.

Andi..



Also, so many thanks in regards to the help you've given me; I

definitely

wouldnt have been able to move forward without it.

On Sat, May 26, 2012 at 6:24 PM, Andi Vajda <va...@apache.org> wrote:



On May 26, 2012, at 1:30, Mark Finkelstein <finkel.m...@gmail.com>

wrote:



Apparently the correct (I think) command is:

python -m jcc.__main__ --find-jvm-dll

But if I use this I get:

C:\Users\avastmatey>python -m jcc.__main__ --find-jvm-dll --jar

"C:\Program

Files\Micro-Manager-1.4\plugins\Micro-Manager\MMCoreJ.jar"
MMCoreJ.jar path = C:\Program
Files\Micro-Manager-1.4\plugins\Micro-Manager\MMCo
reJ.jar
C:\Program Files\Micro-Manager-1.4\plugins\Micro-Manager
C:\Program Files\Micro-Manager-1.4\plugins
C:\Program Files\Micro-Manager-1.4\plugins\mm\win32
C:\Program Files\Micro-Manager-1.4
C:\Program Files\Micro-Manager-1.4\mm\win32
Traceback (most recent call last):
File "C:\Python26\Lib\runpy.py", line 122, in _run_module_as_main
  "__main__", fname, loader, pkg_name)
File "C:\Python26\Lib\runpy.py", line 34, in _run_code
  exec code in run_globals
File "C:\Python26\lib\site-packages\jcc\__main__.py", line 104, in
<module>
  cpp.jcc(sys.argv)
File "C:\Python26\lib\site-packages\jcc\cpp.py", line 632, in jcc
  generics, _dll_export)
File "C:\Python26\lib\site-packages\jcc\cpp.py", line 766, in header
  for method in cls.getDeclaredMethods():
jcc.cpp.JavaError: java.lang.NoClassDefFoundError:

org/json/JSONObject


Where is the org.json.JSONObject class defined ? If it's not in
MMCoreJ.jar then you need to tell jcc via the --classpath flag, for
example, so that it can find it.

Andi..


Java stacktrace:
java.lang.NoClassDefFoundError: org/json/JSONObject
      at java.lang.Class.getDeclaredMethods0(Native Method)
      at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
      at java.lang.Class.getDeclaredMethods(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.json.JSONObject
      at java.net.URLClassLoader$1.run(Unknown Source)
      at java.net.URLClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      ... 3 more

I tried --package org.json, but this did not work?

On Sat, May 26, 2012 at 10:09 AM, Mark Finkelstein <

finkel.m...@gmail.com>wrote:



It is at C:\Python26\Lib\site-packages\jcc.dll. I can also show you

my

installation log:

*** Installation started 2012/05/14 13:29 ***
Source: C:\Users\avastmatey\Downloads\JCC-2.13.win32-py2.6.exe
999 Root Key: HKEY_LOCAL_MACHINE
020 Reg DB Key:
[Software\Microsoft\Windows\CurrentVersion\Uninstall]JCC-py2.6
040 Reg DB Value:






[Software\Microsoft\Windows\CurrentVersion\Uninstall\JCC-py2.6]DisplayName=Python

2.6 JCC-2.13
040 Reg DB Value:






[Software\Microsoft\Windows\CurrentVersion\Uninstall\JCC-py2.6]UninstallString="C:\Python26\RemoveJCC.exe"

-u "C:\Python26\JCC-wininst.log"
200 File Copy: C:\Python26\Lib\site-packages\jcc.dll
100 Made Dir: C:\Python26\Lib\site-packages\jcc
200 File Copy: C:\Python26\Lib\site-packages\jcc\config.py
200 File Copy: C:\Python26\Lib\site-packages\jcc\cpp.py
200 File Copy: C:\Python26\Lib\site-packages\jcc\jcc.lib
200 File Copy: C:\Python26\Lib\site-packages\jcc\python.py
200 File Copy: C:\Python26\Lib\site-packages\jcc\windows.py
200 File Copy: C:\Python26\Lib\site-packages\jcc\_jcc.pyd
200 File Copy: C:\Python26\Lib\site-packages\jcc\__init__.py
200 File Copy: C:\Python26\Lib\site-packages\jcc\__main__.py
100 Made Dir: C:\Python26\Lib\site-packages\jcc\classes
100 Made Dir: C:\Python26\Lib\site-packages\jcc\classes\org
100 Made Dir: C:\Python26\Lib\site-packages\jcc\classes\org\apache
100 Made Dir:

C:\Python26\Lib\site-packages\jcc\classes\org\apache\jcc

200 File Copy:






C:\Python26\Lib\site-packages\jcc\classes\org\apache\jcc\PythonException.class

200 File Copy:


C:\Python26\Lib\site-packages\jcc\classes\org\apache\jcc\PythonVM.class

100 Made Dir: C:\Python26\Lib\site-packages\jcc\patches
200 File Copy: C:\Python26\Lib\site-packages\jcc\patches\patch.4195
200 File Copy:

C:\Python26\Lib\site-packages\jcc\patches\patch.43.0.6c11

200 File Copy:

C:\Python26\Lib\site-packages\jcc\patches\patch.43.0.6c7

100 Made Dir: C:\Python26\Lib\site-packages\jcc\sources
200 File Copy:

C:\Python26\Lib\site-packages\jcc\sources\functions.cpp

200 File Copy:

C:\Python26\Lib\site-packages\jcc\sources\functions.h

200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\JArray.cpp
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\JArray.h
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\jcc.cpp
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\JCCEnv.cpp
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\JCCEnv.h
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\jccfuncs.h
200 File Copy:

C:\Python26\Lib\site-packages\jcc\sources\JObject.cpp

200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\JObject.h
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\macros.h
200 File Copy: C:\Python26\Lib\site-packages\jcc\sources\types.cpp
100 Made Dir: C:\Python26\Lib\site-packages\JCC-2.13-py2.6.egg-info
200 File Copy:






C:\Python26\Lib\site-packages\JCC-2.13-py2.6.egg-info\dependency_links.txt

200 File Copy:
C:\Python26\Lib\site-packages\JCC-2.13-py2.6.egg-info\not-zip-safe
200 File Copy:
C:\Python26\Lib\site-packages\JCC-2.13-py2.6.egg-info\PKG-INFO
200 File Copy:
C:\Python26\Lib\site-packages\JCC-2.13-py2.6.egg-info\SOURCES.txt
200 File Copy:
C:\Python26\Lib\site-packages\JCC-2.13-py2.6.egg-info\top_level.txt
200 File Copy: C:\Python26\Lib\site-packages\jcc\__main__.pyc
200 File Copy: C:\Python26\Lib\site-packages\jcc\__init__.pyc
200 File Copy: C:\Python26\Lib\site-packages\jcc\windows.pyc
200 File Copy: C:\Python26\Lib\site-packages\jcc\python.pyc
200 File Copy: C:\Python26\Lib\site-packages\jcc\cpp.pyc
200 File Copy: C:\Python26\Lib\site-packages\jcc\config.pyc
200 File Copy: C:\Python26\Lib\site-packages\jcc\__main__.pyo
200 File Copy: C:\Python26\Lib\site-packages\jcc\__init__.pyo
200 File Copy: C:\Python26\Lib\site-packages\jcc\windows.pyo
200 File Copy: C:\Python26\Lib\site-packages\jcc\python.pyo
200 File Copy: C:\Python26\Lib\site-packages\jcc\cpp.pyo
200 File Copy: C:\Python26\Lib\site-packages\jcc\config.pyo

I also updated my PATH to be "C:\Program Files
(x86)\Java\jdk1.7.0_04\bin";"C:\Program Files






(x86)\Java\jdk1.7.0_04\lib";C:\Python26;C:\Python26\Lib\site-packages;C:\Python26\Lib\site-packages\PyQt4;"C:\Program

Files (x86)\MiKTeX 2.9\miktex/bin/";"C:\Program
Files\TortoiseSVN\bin";"C:\Program Files (x86)\CMake

2.8\bin";"C:\Program

Files (x86)\Java\jdk1.7.0_04\jre\bin\client"

Again, many thanks for the help.

On Sat, May 26, 2012 at 9:59 AM, Andi Vajda <va...@apache.org>

wrote:




On May 25, 2012, at 22:57, Mark Finkelstein <

finkel.m...@gmail.com



wrote:


Hello everyone!

I hope this is a relevant question. I was trying to use jcc to

create

a

wrapper for a different project's library but when I try to run

python

-m

jcc.main
I get the error C:\Python26\python.exe: DLL load failed: The

specified

module could not be found.
I'm not sure why this is since I put the directory containing

jcc.dll

into

my PATH. I am not sure if it will help, but the following is my

PATH:









C:\Python26;C:\Python26\Lib\site-packages;C:\Python26\Lib\site-packages\PyQt4;"C:\Program

Files (x86)\MiKTeX 2.9\miktex/bin/";"C:\Program
Files\TortoiseSVN\bin";"C:\Program Files (x86)\CMake

2.8\bin";"C:\Program

Files (x86)\Java\jdk1.7.0_04\jre\bin\client"


I don't think jcc.dll is likely to be in any of the directories of

the

PATH you show. What is the full path of the directory containing

jcc.dll on

your system ?

Andi..



Any help would be very much appreciated.

Thank you in advance,

Mark.

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