XJC restriction convert Double to String

i read XML by generated javax.xml.bind-Annotated classes from XSD.

<xsd:complexType name="foo">
  <xsd:attribute name="bar" type="xsd:double" />
</xsd:complexType>

So my class is generated to:

public Double getBar(){....}

Ok, to ensure a double-Attribute is positive, i use xsd:restriction.

<xsd:simpleType name="DoublePositive">
  <xsd:restriction base="xsd:double">
    <xsd:minExclusive value="0" />
  </xsd:restriction>
</xsd:simpleType>

<xsd:complexType name="foo">
  <xsd:attribute name="bar" type="DoublePositive" />
</xsd:complexType>

Too bad, xjc generate a String instead of a Double.

public String getBar(){....}

Can i Force to use Double instead of String?

Solution:

My Question was wrong. I had xsi:type="DoublePositive" instead of type="DoublePositive"

Here is my configuration, which i use to generate classes.

1. test.xsd - your xsd file

    <?xml version="1.0" encoding="utf-8"?>
    <xsd:schema elementFormDefault="qualified" targetNamespace=""
                xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   
      <xsd:simpleType name="DoublePositive">
        <xsd:restriction base="xsd:double">
          <xsd:minExclusive value="0"/>
        </xsd:restriction>
      </xsd:simpleType>
   
      <xsd:complexType name="foo">
        <xsd:attribute name="bar" type="DoublePositive"/>
      </xsd:complexType>
    </xsd:schema>
   

2. text.xml - file with global bindings.

   <jaxb:bindings version="2.1"
                   xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
                   xmlns:xs="http://www.w3.org/2001/XMLSchema">
   
      <jaxb:globalBindings generateElementProperty="false">
        <jaxb:javaType name="java.util.Double" xmlType="DoublePositive"
                       parseMethod="Converter.fromString"
                       printMethod="Converter.toString"/>
      </jaxb:globalBindings> 
    </jaxb:bindings>
   

3. Converter.java - class with conversion functions.

   public class Converter {
     public static Double fromString(String str){
       return Double.parseDouble(str);
     }
   
     public static String toString(Double value){
       return String.valueOf(value);
     }
   }
   

That's all. Call xjc with command

xjc -b test.xml -classpath . test.xsd.

$ xjc -version
xjc version "JAXB 2.1.10" 
JavaTM Architecture for XML Binding(JAXB) Reference Implementation, (build JAXB 2.1.10)
$ xjc -b test.xml -classpath . test.xsd 
parsing a schema... 
[WARNING] EmptyTargetNamespace: In schema document 'file:/pwd/test.xsd', the
value of the 'targetNamespace' attribute cannot be an empty string.  
line 3 of file:/pwd/test.xsd

compiling a schema... 
generated/Adapter1.java
generated/Foo.java
generated/ObjectFactory.java 

and generated file content:

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "foo")
public class Foo {

    @XmlAttribute
    @XmlJavaTypeAdapter(Adapter1 .class)
    protected Double bar;

    /**
     * Gets the value of the bar property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public Double getBar() {
        return bar;
    }

    /**
     * Sets the value of the bar property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setBar(Double value) {
        this.bar = value;
    }

}

and Adapter class

package generated;

import java.util.Double;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class Adapter1
    extends XmlAdapter<String, Double>
{


    public Double unmarshal(String value) {
        return (Converter.fromString(value));
    }

    public String marshal(Double value) {
        return (Converter.toString(value));
    }

}

So, as you can see, xjc generates the classes correctly. If you still get a String, then maybe you forgot to add something in your configuration. But without the details about your configuration, it is impossible to say what is wrong with your code.