Jackson deserialization example for inner classes. The example is in the form of a JUnit test.

JacksonTest.java

package jacksontest;

import java.io.IOException;

import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.junit.Assert;
import org.junit.Test;

public class JacksonTest {

    public static class Foo {
        public static class Qux {
            private String foobar;

            public String getFoobar() {
                return foobar;
            }

            public void setFoobar(String foobar) {
                this.foobar = foobar;
            }
        }

        private String bar;

        // additional property
        private Qux qux;

        public String getBar() {
            return bar;
        }

        public Qux getQux() {
            return qux;
        }

        public void setBar(String bar) {
            this.bar = bar;
        }

        public void setQux(Qux value) {
            qux = value;
        }
    }

    @Test
    public void test() throws JsonParseException, JsonMappingException, IOException {
        String in = "{ \"bar\": \"123\", \"qux\" : {\"foobar\": \"234\"}}";
        ObjectMapper mapper = new ObjectMapper();
        Foo obj = mapper.readValue(in, Foo.class);
        Assert.assertNotNull(obj);
        Assert.assertEquals("123", obj.getBar());
        Assert.assertEquals("234", obj.getQux().getFoobar());
    }

}