I have a JAX-RS webservice (Jersey) that is a CRUD interface for JPA (EclipseLink) entities. My entities were autogenerated from the database tables and I have annotated them with JAXB annotations so that they can be marshalled/unmarshalled to/from XML. My resource methods take JAXBElement objects as a parameter where required.
I don't have an XSD, however, I'm willing to write one to validate the XML received in the requests. But, I don't know how to initiate the validation. Jersey is automatically handling the marshalling/unmarshalling and any references I've found about validation is done at that level.
Does someone know of an example/tutorial that shows how to do this?
Thanks!
You could handle this by creating a custom MessageBodyReader. The example below is based on a Customer model:
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.net.URL;
import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
@Provider
@Consumes("application/xml")
public class ValidatingReader implements MessageBodyReader<Customer> {
@Context
protected Providers providers;
private Schema schema;
public ValidatingReader() {
try {
SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
URL schemaURL = null;
schema = sf.newSchema(schemaURL);
} catch(Exception e) {
throw new RuntimeException(e);
}
}
public boolean isReadable(Class<?> arg0, Type arg1, Annotation[] arg2, MediaType arg3) {
return arg0 == Customer.class;
}
public Customer readFrom(Class<Customer> arg0, Type arg1, Annotation[] arg2, MediaType arg3, MultivaluedMap<String, String> arg4, InputStream arg5)
throws IOException, WebApplicationException {
try {
JAXBContext jaxbContext = null;
ContextResolver<JAXBContext> resolver = providers.getContextResolver(JAXBContext.class, arg3);
if(null != resolver) {
jaxbContext = resolver.getContext(arg0);
}
if(null == jaxbContext) {
jaxbContext = JAXBContext.newInstance(arg0);
}
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
unmarshaller.setSchema(schema);
return (Customer) unmarshaller.unmarshal(arg5);
} catch(JAXBException e) {
throw new RuntimeException(e);
}
}
}