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I have a Java Backend responding rest request with response with this class: package com.commonms.patientportal.tools; import java.util.Collection;import java.util.Collections; import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement; import org.codehaus.jackson.map.annotate.JsonSerialize; @XmlRootElement@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)public class RestResponse<T> { @XmlElement(name = "METADATA") private JsonMetadata jsonMetadata; private Collection<T> result; public RestResponse() { jsonMetadata = new JsonMetadata(); } public RestResponse(JsonMetadata metadata) { this.jsonMetadata = metadata; } public JsonMetadata getJsonMetadata() { return jsonMetadata; } public void setJsonMetadata(JsonMetadata jsonMetadata) { this.jsonMetadata = jsonMetadata; } public Collection<T> getResult() { return result; } public void setResult(Collection<T> result) { this.result = result; } public void setObjectList(Collection<T> objectList) { if (objectList != null) { this.result = objectList; } } public void setObject(T object) { if (object != null) { setObjectList(Collections.singletonList(object)); } } public void setErrorMessage(String msg) { jsonMetadata.setErrorMessage(msg); } public void setWarnMessage(String msg) { jsonMetadata.setWarnMessage(msg); } } And works ok sending something like this: METADATA: {STATUS: "0", ERROR_MESSAGE: ""} result: [{id: "4010", name: "Demo"}] Now I'm trying to use Apache Syncope and want to use maven artifact like read hear: https://syncope.apache.org/docs/reference-guide.html#client-library but when I add this lines: <dependency> <groupId>org.apache.syncope.client</groupId> <artifactId>syncope-client-lib</artifactId> <version>2.1.2</version></dependency> To the pom.xml in my proyect in Eclipse. Only add this lines, Do not do anything else, and then the rest response changes to: jsonMetadata: {status: "0", errorMessage: ""} result: [{id: "4010", name: "Demo"}] For me is a problem because I manage the errors whit this 'METADATA' word. Does anyone know why this change occurs? I ask this question in stackoverflow: https://stackoverflow.com/questions/53558056/apache-syncope-modify-xmlelement/53562458