JAXB marshalling for BigDecimal using fractionDigits

You will need to use XmlAdapter for this use case. Below is a sample binding file that will help you generate them. The logic would be contained in a DecimalFormatter class that contained methods for all the different required formats.

<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="schema.xsd">
        <jxb:bindings node="//xs:element[@name='amount']">
            <jxb:property>
                <jxb:baseType>
                    <jxb:javaType name="java.math.BigDecimal"
                        parseMethod="org.example.DecimalFormatter.parseDecimal"
                        printMethod="org.example.DecimalFormatter.printDecimal_2Places" />
                </jxb:baseType>
            </jxb:property>
        </jxb:bindings>
        <jxb:bindings node="//xs:element[@name='rate']">
            <jxb:property>
                <jxb:baseType>
                    <jxb:javaType name="java.math.BigDecimal"
                        parseMethod="org.example.DecimalFormatter.parseDecimal"
                        printMethod="org.example.DecimalFormatter.printDecimal_5Places" />
                </jxb:baseType>
            </jxb:property>
        </jxb:bindings>
    </jxb:bindings>
</jxb:bindings>

For More Information

• http://blog.bdoughan.com/2011/08/xml-schema-to-java-generating.html