Does JAXB support xsd:restriction?

Question

<xs:element name="age">
  <xs:simpleType>
    <xs:restriction base="xs:integer">
      <xs:minInclusive value="0"/>
      <xs:maxInclusive value="120"/>
    </xs:restriction>
  </xs:simpleType>
</xs:element>

So I want it to get converted to Java code like this:

public void setAge(int age){
    if(age < 0 || age > 120){
         //throw some exception
    }
     //setting the age as it is a valid value
}

Is it possible in JAXB?

Had seen some WebService Client stub generator doing this maybe axis2 webservice but not sure.

score 21 · Accepted Answer · edited Mar 12 '20 at 09:25

21

The JAXB (JSR-222) specification does not cover generating fail fast logic into the domain model. A common practice now is to express validation rules in the form of annotations (or XML) and run validation on them. Bean Validation (JSR-303) standardizes this and is available in any Java EE 6 implementation.

XJC Extensions

I have not tried the following extension myself but it appears as though it will generate Bean Validation (JSR-303) annotations onto the domain model representation validation rules from the XML schema. As XJC is very extensible there may be other plug-ins available as well.

https://github.com/krasa/krasa-jaxb-tools

edited Mar 12 '20 at 09:25

MeTTeO

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answered Dec 12 '12 at 11:46

bdoughan

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1

Thanks and there is one more thing. There is a [http://java.net/jira/browse/JAXB-917] JIRA for JAXB Facets, this is not included in JSR for JAXB. Right? Is this some standard implementation of some other standard? – Narendra Pathai Dec 12 '12 at 12:09
2

@NarendraPathai - This is the first I've heard of JAXB Facets. This is currently not part of the JSR and is being proposed as an enhancement to the JAXB reference implementation. I have posted a comment on the JIRA issue asking about it's compatibility with Bean Validation (JSR-303). A JSR-303 compatible approach would be something that could be supported in a future version of the JAXB specification. – bdoughan Dec 12 '12 at 14:13
1

Thanks Blaise. I follow your blogs and would love to hear about some implementation of this in JAXB. – Narendra Pathai Dec 12 '12 at 18:22
@BlaiseDoughan - What's the status of this? – Everlight Feb 29 '16 at 18:36

score 5 · Answer 2 · answered Dec 10 '12 at 09:07

5

The suggested way to perform this validation in JAXB is switching on schema validation on the marshaller resp. unmarshaller:

SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); 
Schema schema = schemaFactory.newSchema(...);

ValidationEventHandler valHandler = new ValidationEventHandler() {
  public boolean handleEvent(ValidationEvent event) {
      ...
  }
};

marshaller.setSchema(schema);
marshaller.setEventHandler(valHandler);

answered Dec 10 '12 at 09:07

Drunix

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I know but if the schema contains xsd:restriction then the generated code does not reflect those constraints – Narendra Pathai Dec 10 '12 at 09:18
1

Ok, in JAXB standard and RI there are no such mechanisms. I guess they are not used since not all schema constraints can be validated immediately (for example "minOccurs=2"). – Drunix Dec 10 '12 at 09:50
but as I have mentioned in the question have seen some axis tools generating classes which utilize xs:restriction. – Narendra Pathai Dec 10 '12 at 09:59
There used to be the verification plugin, but that is inactive for a long time. Maybe krasa-jaxb-tools comes close to what you are looking for. It generates validation annotations. I have to admit that I have not used it for real projects. – Drunix Dec 11 '12 at 07:41

score 5 · Answer 3 · edited Jun 28 '19 at 07:27

5

You can try JAXB-Facets. Quick snippet:

class MyClass {

    @MinOccurs(1) @MaxOccurs(10)
    @Facets(minInclusive=-100, maxInclusive=100)
    public List<Integer> value;

    @Facets(pattern="[a-z][a-z0-9]{0,4}")
    public String name;

}

edited Jun 28 '19 at 07:27

Jacob van Lingen

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answered Feb 27 '14 at 09:26

vbence

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Does JAXB support xsd:restriction?

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