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JCO sap b1 how to pass parameters to GeneralService


I'm developing an application with JCO java connetor for sap b1. I need to load an UDO, but I don't know how to set my parameters on the general service, in order to load a sepcific record.

On the help center I found this example in VB:

sCmp = oCompany.GetCompanyService

'Get a handle to the SM_MOR UDO
oGeneralService = sCmp.GetGeneralService("SM_MOR")

'Get UDO record
oGeneralParams = oGeneralService.GetDataInterface(SAPbobsCOM.GeneralServiceDataInterfaces.gsGeneralDataParams)

oGeneralParams.SetProperty("DocEntry", "2")
oGeneralData = oGeneralService.GetByParams(oGeneralParams) 

So I tried to write the same code in java:

IGeneralService generalService = company.getCompanyService().getGeneralService("MY_UDO");
IGeneralDataParams generalParams = (IGeneralDataParams)generalService.getDataInterface(SBOCOMConstants.GeneralServiceDataInterfaces_gsGeneralDataParams); 

but it gives me a class cast exception:

ClassCastException: Cannot cast to

So my question is, how can I build an IGeneralDataParams, in order to pass parameters to generalService.getByParams(...)?



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4 Answers

  • Nov 09, 2016 at 03:27 PM

    Hi Giu,

    I usually work with SDK and C#, and I'm not familiarize with JCO, but did you try run your code without do the cast?

    GeneralDataParams generalParams = generalService.getDataInterface(SBOCOMConstants.GeneralServiceDataInterfaces_gsGeneralDataParams);

    Kind Regards,

    Diego Lother

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    Former Member
    Nov 09, 2016 at 04:18 PM

    Hi Diego,

    the problem is that


    returns an Object type, not a GeneralDataParams type.


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    Former Member
    Nov 10, 2016 at 09:11 AM

    I tried to do something like this:

    IGeneralService generalService = company.getCompanyService().getGeneralService("MY_UDO");
    Object dataInterface = generalService.getDataInterface(SBOCOMConstants.GeneralServiceDataInterfaces_gsGeneralDataParams);
    GeneralDataParams gp = new GeneralDataParams(dataInterface);
    gp.setProperty("DocEntry", "1");
    IGeneralData data = generalService.getByParams(gp); 

    But if I call


    it gives me this error: VariantChangeType failed

    I also tried to call the method


    and it seems to work correctly. It gives me an xml populated with expected values.

    So I don't get why data.getProperty("DocEntry") gives error.



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    Former Member
    Nov 10, 2016 at 05:17 PM

    Ok, it's not really clear to me but I think it's a library bug... or meabe I miss something. I decompiled GeneralData.getProperty and this is the code:

    public Object getProperty(String paramString){     
      Variant localVariant =, "GetProperty", paramString);     
      return localVariant.getObject();

    The error is thrown when is called the native method


    I noted that Variant has also other methods to convert the object in a specific type:

    getBoolean(), getString(), getInt() etc...

    So I tried to replicate the same code using the specific convertion method like this:

    Variant myVariant =, "GetProperty", "DocKey");  

    And I noted that using these methods it works!!!

    So, I don't know if this is the right solution, but it works. The only annoing thing is that I have to choose the right method to call according to the expected data type.


    It would be very nice to have a documentation with some code example for JCO sdk from SAP.

    SAP Business One SDK Help Center is usefull, but java is not vb. I know this library is just a wrapper but sometimes a more specific documentation would be better.


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    • Hi Giu,

      If you have installed the Sap Business One SDK on your machine, inside of installation folder/Help/ there is a zip file called JCO. Unzip this and you see the documentation. Unfortunately there is no sample code in this documentation.

      Hope it helps.

      Kind Regards,

      Diego Lother

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