title: XML schema to java classes using XJC
body: <p>I am using an oficial XSD schema downloaded from here:</p>
  
  <p><a href="http://docs.oasis-open.org/ubl/os-UBL-2.0.zip" rel="nofollow">http://docs.oasis-open.org/ubl/os-UBL-2.0.zip</a></p>
  
  <p><em>(Path: xsd/maindoc/UBL-Order-2.0.xsd)</em></p>
  
  <p>And when I use the following command for generating java classes with XJC, I always get an error in console which I don't know how to deal with.</p>
  
  <p><strong>Command:</strong></p>
  
  <pre><code>xjc -d C:\Users\Oscar\Desktop\results -p com.ubl.order C:\Users\Oscar\Desktop\os-UBL-2.0\xsd\maindoc\UBL-Order-2.0.xsd
  </code></pre>
  
  <p><strong>Error:</strong></p>
  
  <pre><code>parsing a schema...
  [WARNING] Simple type "UnitCodeContentType" was not mapped to Enum due to EnumMemberSizeCap limit. Facets count: 1.093, current limit: 256. You can use customization attribute "typesafeEnumMaxMembers" to extend the limit.
    line 38 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/CodeList_UnitCode_UNECE_7_04.xsd
  
  [WARNING] Simple type "BinaryObjectMimeCodeContentType" was not mapped to Enum due to EnumMemberSizeCap limit. Facets count: 616, current limit: 256. You can use customization attribute "typesafeEnumMaxMembers" to extend the limit.
    line 38 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/CodeList_MIMEMediaTypeCode_IANA_7_04.xsd
  
  [WARNING] Simple type "LanguageCodeContentType" was not mapped to Enum due to EnumMemberSizeCap limit. Facets count: 276, current limit: 256. You can use customization attribute "typesafeEnumMaxMembers" to extend the limit.
    line 38 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/CodeList_LanguageCode_ISO_7_04.xsd
  
  compiling a schema...
  [ERROR] A class/interface with the same name "com.ubl.order.LocationType" is already in use. Use a class customization to resolve this conflict.
    line 9890 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonAggregateComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "LocationType" is generated from here.
    line 1543 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.TextType" is already in use. Use a class customization to resolve this conflict.
    line 2598 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "TextType" is generated from here.
    line 1070 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.NameType" is already in use. Use a class customization to resolve this conflict.
    line 1718 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "NameType" is generated from here.
    line 1105 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.AmountType" is already in use. Use a class customization to resolve this conflict.
    line 613 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "AmountType" is generated from here.
    line 57 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.MeasureType" is already in use. Use a class customization to resolve this conflict.
    line 1668 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "MeasureType" is generated from here.
    line 930 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.QuantityType" is already in use. Use a class customization to resolve this conflict.
    line 2143 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "QuantityType" is generated from here.
    line 1035 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.ChannelCodeType" is already in use. Use a class customization to resolve this conflict.
    line 763 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "ChannelCodeType" is generated from here.
    line 119 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.DocumentStatusCodeType" is already in use. Use a class customization to resolve this conflict.
    line 1103 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "DocumentStatusCodeType" is generated from here.
    line 618 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.PackagingTypeCodeType" is already in use. Use a class customization to resolve this conflict.
    line 1873 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "PackagingTypeCodeType" is generated from here.
    line 1113 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.TransportModeCodeType" is already in use. Use a class customization to resolve this conflict.
    line 2753 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "TransportModeCodeType" is generated from here.
    line 1708 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.AllowanceChargeReasonCodeType" is already in use. Use a class customization to resolve this conflict.
    line 603 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "AllowanceChargeReasonCodeType" is generated from here.
    line 19 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.TransportEquipmentTypeCodeType" is already in use. Use a class customization to resolve this conflict.
    line 2728 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "TransportEquipmentTypeCodeType" is generated from here.
    line 1609 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.PaymentMeansCodeType" is already in use. Use a class customization to resolve this conflict.
    line 1978 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "PaymentMeansCodeType" is generated from here.
    line 1212 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.CurrencyCodeType" is already in use. Use a class customization to resolve this conflict.
    line 913 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "CurrencyCodeType" is generated from here.
    line 517 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.LongitudeDirectionCodeType" is already in use. Use a class customization to resolve this conflict.
    line 1563 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "LongitudeDirectionCodeType" is generated from here.
    line 915 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.SubstitutionStatusCodeType" is already in use. Use a class customization to resolve this conflict.
    line 2478 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "SubstitutionStatusCodeType" is generated from here.
    line 1411 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.LineStatusCodeType" is already in use. Use a class customization to resolve this conflict.
    line 1528 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "LineStatusCodeType" is generated from here.
    line 816 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] A class/interface with the same name "com.ubl.order.LatitudeDirectionCodeType" is already in use. Use a class customization to resolve this conflict.
    line 1468 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Relevant to above error) another "LatitudeDirectionCodeType" is generated from here.
    line 717 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 9890 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonAggregateComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1543 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 2598 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1070 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1718 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1105 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 613 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 57 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1668 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 930 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 2143 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1035 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UnqualifiedDataTypeSchemaModule-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 763 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 119 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1103 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 618 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1873 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1113 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 2753 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1708 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 603 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 19 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 2728 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1609 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1978 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1212 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 913 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 517 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1563 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 915 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 2478 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 1411 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1528 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 816 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 1468 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 717 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-QualifiedDatatypes-2.0.xsd
  
  [ERROR] Two declarations cause a collision in the ObjectFactory class.
    line 166 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonAggregateComponents-2.0.xsd
  
  [ERROR] (Related to above error) This is the other declaration.
    line 230 of file:/C:/Users/Oscar/Desktop/os-UBL-2.0/xsd/common/UBL-CommonBasicComponents-2.0.xsd
  
  Failed to produce code.
  </code></pre>
  
  <p>What I tried was to not use the oficial XSD and generate my own using trang.jar. The result was good, I got my generated java classes but when I create a XML document with JAXB (using those classes) the namespaces are not ok.</p>
  
  <p>So, what I want is to use the oficial XSD but modified (maybe) to make it work.</p>
  
  <p><strong>How can I solve this to get my generated classes?</strong> </p>
  
  <p>Thanks in advance.</p>