Orekit Python Wrapper with develop version

Orekit Python Wrapper usage
1

Hello,

I use orekit with its python wrapper.
I have successfully compiled with version 11.3

However, I failed to compile it with orekit develop version.

First, I downloaded orekit-develop zip in GitHub - petrushy/Orekit: This branch contain the java classes for orekit-python-wrapper and I build Orekit with mvn package command.
Then I put .jar file in orekit_python_artifacts folder and I modified build.sh with the right orekit .jar filename.

When I run build.sh I have this error :
jcc.cpp.JavaError: java.lang.NoClassDefFoundError: org/hipparchus/ode/events/FieldODEEventDetector
Java stacktrace:
java.lang.NoClassDefFoundError: org/hipparchus/ode/events/FieldODEEventDetector
Caused by: java.lang.ClassNotFoundException: org.hipparchus.ode.events.FieldODEEventDetector
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)

I think this error come from wrong hipparchus version.
I tried with 2.1 and 2.3 version but that didn’t worked.

Could you help me ?

Thanks
Victor

2

The Orekit development version currently needs the Hipparchgus development version (which will become 3.0 when published).

3

Note that Hipparchus does not use the gitflow model, so the development version corresponds to the master git branch.

4

Thanks for this information.

However, when I run buils.sh by using Hipparchus develop version (master git branch) I have a lot of errors like that :
build/_orekit/wrap83.cpp: In static member function ‘static _jclass* java::util::Map$Entry::initializeClass(bool)’:
build/_orekit/wrap83.cpp:108:15: error: ‘mid_comparingByKey_a201f30ccce87e8a’ was not declared in this scope
mids$[mid_comparingByKey_a201f30ccce87e8a] = env->getStaticMethodID(cls, “comparingByKey”, “()Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
build/_orekit/wrap83.cpp:108:15: note: suggested alternative: ‘mid_comparingByKey_142a1fa1c1bd038f’
mids$[mid_comparingByKey_a201f30ccce87e8a] = env->getStaticMethodID(cls, “comparingByKey”, “()Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mid_comparingByKey_142a1fa1c1bd038f
build/_orekit/wrap83.cpp:109:15: error: ‘mid_comparingByKey_9d63152b635c9115’ was not declared in this scope
mids$[mid_comparingByKey_9d63152b635c9115] = env->getStaticMethodID(cls, “comparingByKey”, “(Ljava/util/Comparator;)Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
build/_orekit/wrap83.cpp:109:15: note: suggested alternative: ‘mid_comparingByKey_142a1fa1c1bd038f’
mids$[mid_comparingByKey_9d63152b635c9115] = env->getStaticMethodID(cls, “comparingByKey”, “(Ljava/util/Comparator;)Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mid_comparingByKey_142a1fa1c1bd038f
build/_orekit/wrap83.cpp:110:15: error: ‘mid_comparingByValue_a201f30ccce87e8a’ was not declared in this scope
mids$[mid_comparingByValue_a201f30ccce87e8a] = env->getStaticMethodID(cls, “comparingByValue”, “()Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
build/_orekit/wrap83.cpp:110:15: note: suggested alternative: ‘mid_comparingByValue_142a1fa1c1bd038f’
mids$[mid_comparingByValue_a201f30ccce87e8a] = env->getStaticMethodID(cls, “comparingByValue”, “()Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mid_comparingByValue_142a1fa1c1bd038f
build/_orekit/wrap83.cpp:111:15: error: ‘mid_comparingByValue_9d63152b635c9115’ was not declared in this scope
mids$[mid_comparingByValue_9d63152b635c9115] = env->getStaticMethodID(cls, “comparingByValue”, “(Ljava/util/Comparator;)Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
build/_orekit/wrap83.cpp:111:15: note: suggested alternative: ‘mid_comparingByValue_142a1fa1c1bd038f’
mids$[mid_comparingByValue_9d63152b635c9115] = env->getStaticMethodID(cls, “comparingByValue”, “(Ljava/util/Comparator;)Ljava/util/Comparator;”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mid_comparingByValue_142a1fa1c1bd038f
build/_orekit/wrap83.cpp:112:15: error: ‘mid_equals_869955b1b19eeaab’ was not declared in this scope
mids$[mid_equals_869955b1b19eeaab] = env->getMethodID(cls, “equals”, “(Ljava/lang/Object;)Z”);
^~~~~~~~~~~~~~~~~~~~~~~~~~~

5

Sorry, I have no idea what happens.
@petrus.hyvonen do you understand what is the problem?

6

Hi,

Oh hard to say. Some approaches I would suggest:

  • First try to compile it as-is from the orekit-artifacts to see if your environment is working properly with the “known working” code
  • There may be some keywords that may mess with python, add these to build scripts with the “reserverd” parameter
  • You can also try to exclude classes from being wrapped with the “exclude” directive, to try to figure out what is going wrong.

It can require a bit of messing about to build it from scratch, that’s why I typically recommend using the coda package if posisible.

Depending on your use case, it can also be worth having a look at the experimental alternative orekit_jpype, it works differently based on jpype which is not wrapping but interfacing java on-the-fly., less risk of building issues. Not possible to subclass in jpype but most things are still available through specifying interfaces. Files · master · Petrus Hyvönen / orekit_jpype · GitLab

7

It’s ok, I made it.

The problem was build folder generated by build.sh was not right because script wrap83.cpp and wrap84.cpp are in the build/_orekit folder of master version but not in build/_orekit folder of develop version.
When I run the build.sh of develop version, these files are not automatically remove.
So I remove build folder before running build.sh.

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