Are there Scala examples?

[RuthAnn Haefli]

Hello OptaPlanner Team,

 Do you have any Scala examples? 

I am new to OptaPlanner and am having trouble with the OptaPlanner and OptaPy installations.  I would like to run this in either python or scala (on Azure Databricks).  I can install the java package on databricks but cannot run the examples (as they are in java).  I've been trying to convert a java example to scala but am having trouble.  (I cannot use the Quark.io method as it doesn't work for the project I am working on.) 

Issues I am facing:

• OptaPy Install: When installing OptaPy it fails because JPype1 is not installed.  I go to install JPyPe1 but have issues that I have not been able to resolve.  (I am using JDK17).  When installing JPype1 I get the following errors (and similar errors when installing OptaPy)
  • Running setup.py install for JPype1 ... error
  • ERROR: Command errored out with exit status 1:
• OptaPlanner Install on Vanilla Eclipse: When installing OptaPlanner I install through vanilla eclipse.  I follow this tutorial to set up the files: https://www.google.com/search?q=Optaplanner+eclispe+tutorial&rlz=1C1CHBF_enUS705US706&oq=Optaplanner+eclispe+tutorial&aqs=chrome..69i57j33i10i160.8561j0j1&sourceid=chrome&ie=UTF-8#kpvalbx=_ID6qYbvpG9qztQarlafYDQ31  This almost works.  I can get the Example App screen running, but when I click on an example run into an error:
  • Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException

• OptaPlanner Install on Intellij: I install OptaPlanner as specified in the User Guide, but get the following error: 
  • java: error: invalid source release: 17
  • Module optaplanner-examples SDK 1.8 is not compatible with the source version 17.
  • Upgrade Module SDK in project settings to 17 or higher. Open project settings.
• Converting to Scala: I am able to install the OptaPlanner java package in Azure Databricks.  However, I having trouble converting the example timetableschooling example in scala - specifically with the constraints as discussed here: https://groups.google.com/g/optaplanner-dev/c/bJGUbS-5Fdk/m/6_SoFBYQAgAJ.  After reading this discussing I am still having trouble converting this code as needed.

I greatly appreciate your time.

Best,

RuthAnn

 

[Christopher Chianelli]

In regards to OptaPy, what is the full log when installing using `pip`? Is `JAVA_HOME` set properly and a C compiler tool chain installed (https://jpype.readthedocs.io/en/latest/install.html#if-it-fails)?

In regards to OptaPlanner install on Eclipse, it look like a classpath issue. Is all of OptaPlanner dependencies on the classpath?

In regards to OptaPlanner install on Intellij, you need to modify your module settings; click "Open project settings".

[RuthAnn Haefli]

Thank you for your quick response.

• OptaPy: I believe my issue was the C compiler.  I had issues installing this earlier.  I've installed this compiler here: http://www.codeblocks.org/downloads/binaries/#imagesoswindows48pnglogo-microsoft-windows.  But when I run the setup file from codeblocks and install JPype1 I still get the same issue.  See attached snippet at the bottom of this message
• OptaPlanner on Intellij:  What do I need to modify those settings to?  Is this in the user guide - If so, could you point to what you are referring to? (user guide: https://docs.optaplanner.org/8.14.0.Final/optaplanner-docs/pdf/optaplanner-docs.pdf)
• OptaPlanner install on Eclipse: Working on this...
  

OptaPy Install error output:

C:\WINDOWS\system32>pip install OptaPy

Collecting OptaPy

  Using cached optapy-8.11.0a2-py3-none-any.whl (17.8 MB)

Collecting JPype1

  Using cached JPype1-1.3.0.tar.gz (820 kB)

Using legacy 'setup.py install' for JPype1, since package 'wheel' is not installed.

Installing collected packages: JPype1, OptaPy

    Running setup.py install for JPype1 ... error

    ERROR: Command errored out with exit status 1:

     command: 'C:\Users\RuthAnn Haefli\AppData\Local\Programs\Python\Python310\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\RuthAnn Haefli\\AppData\\Local\\Temp\\pip-install-axs5ugpy\\jpype1_cc2e16a6db3d4e6ea9cb1c6c91701b1f\\setup.py'"'"'; __file__='"'"'C:\\Users\\RuthAnn Haefli\\AppData\\Local\\Temp\\pip-install-axs5ugpy\\jpype1_cc2e16a6db3d4e6ea9cb1c6c91701b1f\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\RuthAnn Haefli\AppData\Local\Temp\pip-record-t5sylcmv\install-record.txt' --single-version-externally-managed --compile --install-headers 'C:\Users\RuthAnn Haefli\AppData\Local\Programs\Python\Python310\Include\JPype1'

         cwd: C:\Users\RuthAnn Haefli\AppData\Local\Temp\pip-install-axs5ugpy\jpype1_cc2e16a6db3d4e6ea9cb1c6c91701b1f\

    Complete output (55 lines):

    Falling back to provided JNI headers, since your provided JAVA_HOME "C:\Program Files\Java\jdk-17.0.1\bin" does not provide jni.h

    Falling back to provided JNI headers, since your provided JAVA_HOME "C:\Program Files\Java\jdk-17.0.1\bin" does not provide jni.h

    Falling back to provided JNI headers, since your provided JAVA_HOME "C:\Program Files\Java\jdk-17.0.1\bin" does not provide jni.h

    Falling back to provided JNI headers, since your provided JAVA_HOME "C:\Program Files\Java\jdk-17.0.1\bin" does not provide jni.h

    running install

    running build

    running build_py

    creating build

    creating build\lib.win-amd64-3.10

    creating build\lib.win-amd64-3.10\jpype

    copying jpype\beans.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\config.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\dbapi2.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\imports.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\nio.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\pickle.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\protocol.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\types.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_classpath.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_core.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_gui.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jarray.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jclass.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jcollection.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jcustomizer.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jexception.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jinit.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jio.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jmethod.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jobject.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jpackage.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jproxy.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jstring.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jthread.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jvmfinder.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\_pykeywords.py -> build\lib.win-amd64-3.10\jpype

    copying jpype\__init__.py -> build\lib.win-amd64-3.10\jpype

    package init file 'jpype\_pyinstaller\__init__.py' not found (or not a regular file)

    creating build\lib.win-amd64-3.10\jpype\_pyinstaller

    copying jpype\_pyinstaller\entry_points.py -> build\lib.win-amd64-3.10\jpype\_pyinstaller

    copying jpype\_pyinstaller\example.py -> build\lib.win-amd64-3.10\jpype\_pyinstaller

    copying jpype\_pyinstaller\hook-jpype.py -> build\lib.win-amd64-3.10\jpype\_pyinstaller

    copying jpype\_pyinstaller\test_jpype_pyinstaller.py -> build\lib.win-amd64-3.10\jpype\_pyinstaller

    copying jpype\_core.pyi -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jcollection.pyi -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jio.pyi -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jstring.pyi -> build\lib.win-amd64-3.10\jpype

    copying jpype\_jthread.pyi -> build\lib.win-amd64-3.10\jpype

    running build_ext

    Call build extensions

    Using Jar cache

    copying native\jars\org.jpype.jar -> build\lib.win-amd64-3.10

    Call build ext

    building '_jpype' extension

    error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/

    ----------------------------------------

ERROR: Command errored out with exit status 1: 'C:\Users\RuthAnn Haefli\AppData\Local\Programs\Python\Python310\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\RuthAnn Haefli\\AppData\\Local\\Temp\\pip-install-axs5ugpy\\jpype1_cc2e16a6db3d4e6ea9cb1c6c91701b1f\\setup.py'"'"'; __file__='"'"'C:\\Users\\RuthAnn Haefli\\AppData\\Local\\Temp\\pip-install-axs5ugpy\\jpype1_cc2e16a6db3d4e6ea9cb1c6c91701b1f\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\RuthAnn Haefli\AppData\Local\Temp\pip-record-t5sylcmv\install-record.txt' --single-version-externally-managed --compile --install-headers 'C:\Users\RuthAnn Haefli\AppData\Local\Programs\Python\Python310\Include\JPype1' Check the logs for full command output.

WARNING: You are using pip version 21.2.3; however, version 21.3.1 is available.

You should consider upgrading via the 'C:\Users\RuthAnn Haefli\AppData\Local\Programs\Python\Python310\python.exe -m pip install --upgrade pip' command.

[Christopher Chianelli]

OptaPy: Look like it is indeed the C toolchain:

    error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/

OptaPlanner on Intellij: It not in the User Guide (nor is it OptaPlanner specific); go to Project Setting > Modules, set Language Level to 17 in the "Sources" tab, set Module SDK to 17 in the "Dependencies" tab. Intellij should guide you on what need to be changed if you click on the link "Open project settings".

[Geoffrey De Smet]

Hi,

The java hello world example is probably the best one to transform into scala:
  https://github.com/kiegroup/optaplanner-quickstarts/tree/stable/hello-world

We have scala developers that successfully use optaplanner from scala,
but it's been a while since I saw new optaplanner projects using scala.
(These days we hear a lot about kotlin, so we added a quickstarts for that.)

If you run into particular issues with converting the hello world example to scala,
let us know, we're happy to help. If you can share the code repo, that could make it easier to try for ourselves.

With kind regards,
Geoffrey De Smet

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