I am trying to read a JSON into the class. Jackson wants to apply a field of a subelement to the element itself, where it of course does not exist.
This is the JSON:
{
"authorizationRequest":{
"scope":["write","read"],
"resourceIds":["metadata"],
"approved":true,
"authorities":[],
"authorizationParameters":{
"scope":"write read",
"response_type":"token",
"redirect_uri":"",
"state":"",
"stateful":"false",
"client_id":"5102686_metadata"
},
"approvalParameters":{},
"state":"",
"clientId":"5102686_metadata",
"redirectUri":"",
"responseTypes":["token"],
"denied":false
},
"credentials":"",
"clientOnly":false,
"name":"testuser"
}
The classes look like the following:
// The main class that I try do deserialize:
public class DeserializedOAuth2Authentication extends OAuth2Authentication{
private String name;
private boolean clientOnly;
private AuthorizationRequest authorizationRequest = new DefaultAuthorizationRequest("", new ArrayList<>());
public DeserializedOAuth2Authentication() {
super(new DefaultAuthorizationRequest("", new ArrayList<>()), null);
}
@Override
@JsonProperty
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
@JsonProperty
public boolean isClientOnly() {
return clientOnly;
}
public void setClientOnly(boolean clientOnly) {
this.clientOnly = clientOnly;
}
@Override
@JsonProperty
public AuthorizationRequest getAuthorizationRequest() {
return authorizationRequest;
}
public void setAuthorizationRequest(AuthorizationRequest authorizationRequest) {
this.authorizationRequest = authorizationRequest;
}
}
AuthorizationRequest is an interface with all the getters for the listed elements; it is configured to be serialized by a DefaultAuthorizationRequest class also containing the respective setters and implementing fileds with corresponding names.
public class DefaultAuthorizationRequest implements AuthorizationRequest, Serializable {
private Set<String> scope = new LinkedHashSet<String>();
private Set<String> resourceIds = new HashSet<String>();
private boolean approved = false;
private Collection<GrantedAuthority> authorities = new HashSet<GrantedAuthority>();
private Map<String, String> authorizationParameters = new ConcurrentHashMap<String, String>();
private Map<String, String> approvalParameters = new HashMap<String, String>();
private String resolvedRedirectUri;
public Map<String, String> getAuthorizationParameters() {
return Collections.unmodifiableMap(authorizationParameters);
}
public Map<String, String> getApprovalParameters() {
return Collections.unmodifiableMap(approvalParameters);
}
public String getClientId() {
return authorizationParameters.get(CLIENT_ID);
}
public Set<String> getScope() {
return Collections.unmodifiableSet(this.scope);
}
public Set<String> getResourceIds() {
return Collections.unmodifiableSet(resourceIds);
}
public Collection<GrantedAuthority> getAuthorities() {
return Collections.unmodifiableSet((Set<? extends GrantedAuthority>) authorities);
}
public boolean isApproved() {
return approved;
}
public boolean isDenied() {
return !approved;
}
public String getState() {
return authorizationParameters.get(STATE);
}
public String getRedirectUri() {
return resolvedRedirectUri == null ? authorizationParameters.get(REDIRECT_URI) : resolvedRedirectUri;
}
public Set<String> getResponseTypes() {
return OAuth2Utils.parseParameterList(authorizationParameters.get(RESPONSE_TYPE));
}
public void setRedirectUri(String redirectUri) {
this.resolvedRedirectUri = redirectUri;
}
public void setScope(Set<String> scope) {
this.scope = scope == null ? new LinkedHashSet<String>() : new LinkedHashSet<String>(scope);
authorizationParameters.put(SCOPE, OAuth2Utils.formatParameterList(scope));
}
public void setResourceIds(Set<String> resourceIds) {
this.resourceIds = resourceIds == null ? new HashSet<String>() : new HashSet<String>(resourceIds);
}
public void setApproved(boolean approved) {
this.approved = approved;
}
public void setAuthorities(Collection<? extends GrantedAuthority> authorities) {
this.authorities = authorities == null ? new HashSet<GrantedAuthority>() : new HashSet<GrantedAuthority>(
authorities);
}
public void setAuthorizationParameters(Map<String, String> authorizationParameters) {
String clientId = getClientId();
Set<String> scope = getScope();
this.authorizationParameters = authorizationParameters == null ? new HashMap<String, String>()
: new HashMap<String, String>(authorizationParameters);
}
public void setApprovalParameters(Map<String, String> approvalParameters) {
this.approvalParameters = approvalParameters == null ? new HashMap<String, String>()
: new HashMap<String, String>(approvalParameters);
}
....
}
On calling read on the above JSON string I get an exception
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "scope" (class de.mvbonline.vlx.auth.oauth2.DeserializedOAuth2Authentication), not marked as ignorable (3 known properties: "name", "authorizationRequest", "clientOnly"])
at [Source: (String)"{ "credentials":"", "clientOnly":false, "authorizationRequest":{ "scope":["write","read"], "resourceIds":["metadata"], "approved":true, "authorities":[], "authorizationParameters":{ "scope":"write read", "response_type":"token", "redirect_uri":"", "state":"", "stateful":"false", "[truncated 316 chars]; line: 1, column: 111] (through reference chain: de.mvbonline.vlx.auth.oauth2.DeserializedOAuth2Authentication["scope"])
Of course the field "scope" is not in the context of DeserializedOAuth2Authentication, but in the context of DefaultAuthorizationRequest. Why is Jackson searching in the wrong class for it? I am unsing Jackson version 2.12.4
CodePudding user response：
Make sure that DefaultAuthorizationRequest can be serialized and deserialized by Jackson. I guess that they are not for several reasons. Two that I can think of:
- You have to let Jackson know how to deserialize
DefaultAuthorizationRequestclass. One possible solution would be to add a@JsonCreatorand@JsonPropertyto the class. The same applies toGrantedAuthorityclass. DefaultAuthorizationRequesthas fields of typeMap, which need special attention. See these links on how to convert a JSON String to a Map<String, String> or, if theMaphas custom objects, how to deserialize into a HashMap of custom objects
Also, you can take a look at Map Serialization and Deserialization with Jackson
CodePudding user response：
I found my problem.
I formerly mapped my concrete implementation of the interface AuthorizationRequest via a handler:
mapper.addHandler(new DeserializationProblemHandler() {
@Override
public Object handleMissingInstantiator(DeserializationContext ctxt, Class<?> instClass, ValueInstantiator valueInsta, JsonParser p, String msg) throws IOException {
if(instClass.isAssignableFrom(AuthorizationRequest.class)) {
return new DeserializedAuthorizationRequest();
}
return super.handleMissingInstantiator(ctxt, instClass, valueInsta, p, msg);
}
});
This seems to be definitely not the same as annotating the field with the concrete class. This now works without problems:
public class DeserializedOAuth2Authentication extends OAuth2Authentication{
...
@Override
@JsonProperty("authorizationRequest")
@JsonDeserialize(as = DeserializedAuthorizationRequest.class)
public AuthorizationRequest getAuthorizationRequest() {
return authorizationRequest;
}
public void setAuthorizationRequest(AuthorizationRequest authorizationRequest) {
this.authorizationRequest = authorizationRequest;
}
}