Xml Schema / JaxB -- How to enable empty enumerations, string, integer values in schema without validation errors?

Question

I tried a couple of things:

1)

<xs:simpleType name="matchAnalysisType">
    <xs:restriction base="xs:string">
        <xs:enumeration value="A"/>
        <xs:enumeration value=""/>
    </xs:restriction>
 </xs:simpleType>

JaxB DOESN'T generate enums and instead marks matchAnalysisType as string for the corresponding element type.

2) Use 'nillable':

 <xs:element name="matchAnalysisType" type="matchAnalysisType"  
     nillable="true">                
 </xs:element>

JaxB throws error that '' is not valid.

The issue holds true for other element types like the following:

 <xs:element name="accountNumber" minOccurs="0">                
     <xs:simpleType>
         <xs:restriction base="xs:integer">
             <xs:totalDigits value="9"/>
         </xs:restriction>
     </xs:simpleType>
  </xs:element>

I'd like to have a sample xml that allows this the following without any validation errors.

 <accountNumber></accountNumber>

Thoughts?

bdoughan · Accepted Answer · 2011-10-10 20:54:21Z

2

JAXB does not have a default enum value name for enum values corresponding to "". Your JAXB implementation can generate a Java enum corresponding to this XML schema type if you use an external bindings file to provide a name.

binding.xml

<jxb:bindings
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
    version="2.1">
    <jxb:bindings schemaLocation="your-schema.xsd">
        <jxb:bindings node="//xs:simpleType[@name='matchAnalysisType']/xs:restriction/xs:enumeration[@value='']">
            <jxb:typesafeEnumMember name="BLANK"/>
        </jxb:bindings>
    </jxb:bindings>
</jxb:bindings>

XJC Call

The binding file is specified in the XJC call using the -b parameter:

xjc -b binding.xml your-schema.xsd

For More Information

http://blog.bdoughan.com/2011/08/jaxb-and-enums.html

edited Oct 10, 2011 at 20:54

answered Oct 10, 2011 at 16:10

bdoughan

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1 Comment

pri Over a year ago

pleas seemmy response above. FYI, not sure how you can add a large 'comment' to an answer.

himanshu · Accepted Answer · 2011-12-06 22:36:08Z

1

Here is the solution :

tyesafeEnumMemberName has by default value generateError and you can specify value generateName.

This attribute was not present in our xjc file. Now this fixes the autogneration.

<jxb:bindings schemaLocation="your.xsd" node="/xsd:schema"> 
                <jxb:globalBindings typesafeEnumMaxMembers="9000"         typesafeEnumMemberName="generateName" >
                            <xjc:simple/>
            </jxb:globalBindings>

edited Dec 6, 2011 at 22:36

answered Dec 6, 2011 at 22:30

himanshu

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