Complex SOAP payloads with JAXB

Our introductory guides for Quarkus SOAP client and SOAP service dealt with services having only primitive parameters and return values such as integers and strings. Let’s have a look at passing and receiving more complex objects.

As an example, let’s create an application for managing fruits.

The sample code snippets used in this section come from the server integration test in the source tree of CXF Extensions for Quarkus

Because our representation of fruit is supposed to be a complex, let’s model it as a Java bean with a couple of attributes:

package io.quarkiverse.cxf.it.server;

import java.util.Objects;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlType(name = "Fruit")
@XmlRootElement
public class Fruit {

    private String name;

    private String description;

    public Fruit() {
    }

    public Fruit(String name, String description) {
        this.name = name;
        this.description = description;
    }

    public String getName() {
        return name;
    }

    @XmlElement
    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

    @XmlElement
    public void setDescription(String description) {
        this.description = description;
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Fruit)) {
            return false;
        }

        Fruit other = (Fruit) obj;

        return Objects.equals(other.getName(), this.getName());
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.getName());
    }
}

As you may have noticed, we have used some JAXB annotations, such as @XmlElement, @XmlRootElement and @XmlType. This is to control the serialization and deserialization of the bean from and to XML.

Automatic registration for reflection

JAXB is a reflection based serialization framework. When learning about GraalVM native images, one of the first things you typically hear is that you have to register classes, fields and methods for reflection at build time. With plain GraalVM you’d have to do this through reflection-config.json manually. Well, at least for the classes you have written yourself. Not so with Quarkus. quarkus-jaxb extension (which quarkus-cxf depends on) is able to scan your application’s class path for classes annotated with JAXB annotations and register them for reflection automatically.

Hence working with complex payloads on Quarkus is not different from stock CXF. The JAXB serialization and deserialization will work out of the box without any additional configuration.

SEI and implementation

The Service Endpoint Interface (SEI) for managing fruits might look like the following:

package io.quarkiverse.cxf.it.server;

import java.util.Set;

import javax.jws.WebMethod;
import javax.jws.WebService;

@WebService
public interface FruitService {

    @WebMethod
    Set<Fruit> list();

    @WebMethod
    Set<Fruit> add(Fruit fruit);

    @WebMethod
    Set<Fruit> delete(Fruit fruit);
}

We can implement the SEI as simply as possible:

package io.quarkiverse.cxf.it.server;

import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

import javax.jws.WebService;

@WebService(serviceName = "FruitService")
public class FruitServiceImpl implements FruitService {

    private Set<Fruit> fruits = Collections.synchronizedSet(new LinkedHashSet<>());

    public FruitServiceImpl() {
        fruits.add(new Fruit("Apple", "Winter fruit"));
        fruits.add(new Fruit("Pineapple", "Tropical fruit"));
    }

    @Override
    public Set<Fruit> list() {
        return fruits;
    }

    @Override
    public Set<Fruit> add(Fruit fruit) {
        fruits.add(fruit);
        return fruits;
    }

    @Override
    public Set<Fruit> delete(Fruit fruit) {
        fruits.remove(fruit);
        return fruits;
    }
}

`application.properties`

The implementation is pretty straightforward and you just need to define your endpoints using the application.properties.

quarkus.cxf.endpoint."/fruits".implementor=io.quarkiverse.cxf.it.server.FruitServiceImpl
quarkus.cxf.endpoint."/fruits".features=org.apache.cxf.ext.logging.LoggingFeature

Test with Quarkus `dev` mode and `curl`

Having the above files in place, you can start Quarkus tooling in dev mode:

$ mvn quarkus:dev
...
INFO  [io.quarkus] (Quarkus Main Thread) ... Listening on: http://localhost:8080

and then check whether the service is working by invoking its list operation:

$ curl -v -X POST -H "Content-Type: text/xml;charset=UTF-8" \
    -d \
      '<soapenv:Envelope
      xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
      xmlns:ns1="http://server.it.cxf.quarkiverse.io/">
        <soapenv:Body>
            <ns1:list/>
        </soapenv:Body>
    </soapenv:Envelope>' \
    http://localhost:8080/soap/fruits
...
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <ns1:listResponse xmlns:ns1="http://server.it.cxf.quarkiverse.io/">
      <return xmlns:ns2="http://server.it.cxf.quarkiverse.io/">
        <description>Winter fruit</description>
        <name>Apple</name>
      </return>
      <return xmlns:ns2="http://server.it.cxf.quarkiverse.io/">
        <description>Tropical fruit</description>
        <name>Pineapple</name>
      </return>
    </ns1:listResponse>
  </soap:Body>
</soap:Envelope>

As you can see, the endpoint has returned the two fruits Apple and Pineapple available by default.

Now let’s add another fruit, say an Orange:

$ curl -v -X POST -H "Content-Type: text/xml;charset=UTF-8" \
    -d \
     '<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
        <soap:Body>
          <ns2:add xmlns:ns2="http://server.it.cxf.quarkiverse.io/">
            <arg0>
              <description>Mediterranean fruit</description>
              <name>Orange</name>
            </arg0>
          </ns2:add>
       </soap:Body></soap:Envelope>' \
    http://localhost:8080/soap/fruits
...
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <ns1:addResponse xmlns:ns1="http://server.it.cxf.quarkiverse.io/">
      <return xmlns:ns2="http://server.it.cxf.quarkiverse.io/">
        <description>Winter fruit</description>
        <name>Apple</name>
      </return>
      <return xmlns:ns2="http://server.it.cxf.quarkiverse.io/">
        <description>Tropical fruit</description>
        <name>Pineapple</name>
      </return>
      <return xmlns:ns2="http://server.it.cxf.quarkiverse.io/">
        <description>Mediterranean fruit</description>
        <name>Orange</name>
      </return>
    </ns1:addResponse>
  </soap:Body>
</soap:Envelope>

We can see Orange having been added in the returned list as expected.

Further steps

You may want to proceed with packaging your application for running on a JVM or natively.