Displaying a JAX-RS enum using @XmlEnumValue
I am trying to display this JSON:
{"ref":"code","type":"desc"}
With these JAX-RS classes:
public class Sorting {
public String ref;
public SortingType type;
}
@XmlType
@XmlEnum
public enum SortingType {
@XmlEnumValue("asc")
ASCENDING,
@XmlEnumValue("desc")
DESCENDING;
}
I have this error (I am using JBoss EAP 6.2):
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not construct instance of com.mycompany.myproject.SortingType from String value 'desc': value not one of declared Enum instance names
at [Source: org.apache.catalina.connector.CoyoteInputStream@76e7449; line: 1, column: 47] (through reference chain: com.mycompany.myproject.Sorting["type"])
at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
After looking at the documentation , I also tried this definition without any success:
@XmlType
@XmlEnum
public enum SortingType {
@XmlEnumValue("asc")
ASCENDING("asc"),
@XmlEnumValue("desc")
DESCENDING("desc");
private String code;
SortingType(String code) {
this.code = code;
}
}
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2 answers
I used this ugly code expecting a better answer:
@XmlEnum
public enum SortingType {
@XmlEnumValue("asc")
ASCENDING,
@XmlEnumValue("desc")
DESCENDING;
private static Map<String, SortingType> sortingTypeByValue = new HashMap<>();
private static Map<SortingType, String> valueBySortingType = new HashMap<>();
static {
SortingType[] enumConstants = SortingType.class.getEnumConstants();
for (SortingType sortingType : enumConstants) {
try {
String value = SortingType.class.getField(sortingType.name()).getAnnotation(XmlEnumValue.class).value();
sortingTypeByValue.put(value, sortingType);
valueBySortingType.put(sortingType, value);
} catch (NoSuchFieldException e) {
throw new IllegalStateException(e);
}
}
}
@JsonCreator
public static SortingType create(String value) {
return sortingTypeByValue.get(value);
}
@JsonValue
public String getValue() {
return valueBySortingType.get(this);
}
}
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Old question, but I'll give this shot ... I am not using annotated XML types, but I had the same problem converting enums to JSON.
In my webapp, I already had a custom objectMapper to handle my use of JodaTime objects, so I added a serialize / deserialize function in the PostConstruct method.
import javax.annotation.PostConstruct;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.joda.JodaModule;
@Provider
public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper>{
final ObjectMapper mapper = new ObjectMapper();
public ObjectMapperContextResolver() {
mapper.registerModule(new JodaModule());
}
@Override
public ObjectMapper getContext(Class<?> type) {
return mapper;
}
@PostConstruct
public void customConfiguration(){
mapper.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);
mapper.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
}
}
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