Tree Model (JsonNode) with global typing #353
Description
I am trying to persist my spring security based entities to database. I need to serialize Session Attributes Map<String, Object> to database correctly by preserving their id infos. I had enabled object mapper as this: mapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.NON_FINAL, "@class"); . However when I tried to deserialize, I am having an issue.
com.fasterxml.jackson.databind.JsonMappingException: Unexpected token (END_OBJECT), expected FIELD_NAME: missing property '@class' that is to contain type id (for class com.fasterxml.jackson.databind.JsonNode)
at [Source: java.io.StringReader@b240236; line: 1, column: 193]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
at com.fasterxml.jackson.databind.DeserializationContext.wrongTokenException(DeserializationContext.java:784)
at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedUsingDefaultImpl(AsPropertyTypeDeserializer.java:147)
at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:95)
at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromAny(AsPropertyTypeDeserializer.java:165)
I can actually see @class in my output but still causing an error.
{"@class":"com.fasterxml.jackson.databind.jsontype.TestDefaultForObject$SavedCookie","name":"Cemo","value":"a","comment":"co","domain":"do","maxAge":12,"path":"/asd","secure":true,"version":12}
I started to consider that there is little bug. You can also check yourself too.
public class SavedCookie implements Serializable {
private final java.lang.String name;
private final java.lang.String value;
private final java.lang.String comment;
private final java.lang.String domain;
private final int maxAge;
private final java.lang.String path;
private final boolean secure;
private final int version;
public SavedCookie(String name, String value, String comment, String domain, int maxAge, String path, boolean secure, int version) {
this.name = name;
this.value = value;
this.comment = comment;
this.domain = domain;
this.maxAge = maxAge;
this.path = path;
this.secure = secure;
this.version = version;
}
public String getName() {
return name;
}
public String getValue() {
return value;
}
public String getComment() {
return comment;
}
public String getDomain() {
return domain;
}
public int getMaxAge() {
return maxAge;
}
public String getPath() {
return path;
}
public boolean isSecure() {
return secure;
}
public int getVersion() {
return version;
}
}
public class SavedCookieDeserializer extends JsonDeserializer<SavedCookie> {
@Override
public SavedCookie deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException {
ObjectCodec oc = jsonParser.getCodec();
JsonNode node = oc.readTree(jsonParser);
return new SavedCookie( node.get("name") != null ? node.get("name").asText() : null,
node.get("value") != null ? node.get("value").asText() : null,
node.get("comment") != null ? node.get("comment").asText() : null,
node.get("domain") != null ? node.get("domain").asText() : null,
node.get("maxAge") != null ? node.get("maxAge").asInt() : 0,
node.get("path") != null ? node.get("path").asText() : null,
node.get("secure") != null && node.get("secure").asBoolean(),
node.get("version") != null ? node.get("version").asInt() : 0);
}
}
public void testIssue() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.NON_FINAL, "@class");
SimpleModule testModule = new SimpleModule("MyModule", new Version(1, 0, 0, null, "TEST", "TEST"));
testModule.addDeserializer(SavedCookie.class, new SavedCookieDeserializer());
mapper.registerModule(testModule);
SavedCookie savedCookie = new SavedCookie("Cemo", "a", "co", "do", 12, "/asd", true, 12);
// persist at db
String x = mapper.writeValueAsString(savedCookie);
// read from db
SavedCookie o = mapper.reader(SavedCookie.class).readValue(x);
}