I working on different web-services, and I always use WSDL First.

JAXB generates for a Type like:

<xsd:simpleType name="CurrencyFormatTyp">
    <xsd:restriction base="xsd:decimal">
        <xsd:totalDigits value="13"/>
        <xsd:fractionDigits value="2"/>
        <xsd:minInclusive value="0.01"/>
    </xsd:restriction>
</xsd:simpleType>

a Java binding type BigDecimal (as it's mentioned in JAXB specification).

When I then do some simple arithmetic operation with values of the type double (which are stored in a database and mapped via hibernate to the type double) I run into trouble.

<ns5:charge>0.200000000000000011102230246251565404236316680908203125</ns5:charge>        
<ns5:addcharge>0.0360000000000000042188474935755948536098003387451171875</ns5:addcharge>
<ns5:tax>0.047199999999999998900879205621095024980604648590087890625</ns5:tax>
<ns5:totalextax>0.2360000000000000153210777398271602578461170196533203125</ns5:totalextax>

What would be the right way?

1. Convert all my values into double (JAXB binding from BigDecimal to double)
2. Hibernate mapping double to Bigdecimal

and do all my arithmetic operations in one object type.