diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Community.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Community.java
index 530e41c..969ecff 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Community.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Community.java
@@ -8,7 +8,13 @@ import lombok.NonNull;
 @NoArgsConstructor
 public class Community {
 
-	@NonNull
+//	@NonNull
 	private String identifier;
+
+	public Community(String identifier) {
+		super();
+		this.identifier = identifier;
+	}
+	
 	
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Contributor.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Contributor.java
index d07035b..36b7d35 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Contributor.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Contributor.java
@@ -10,7 +10,7 @@ import lombok.ToString;
 @Getter
 @Setter
 @ToString
-@RequiredArgsConstructor
+//@RequiredArgsConstructor
 @NoArgsConstructor
 public class Contributor extends Creator {
 
@@ -40,9 +40,11 @@ public class Contributor extends Creator {
 	}
 	
 	
-	@NonNull
+//	@NonNull
 	private Type type;
 
+	
+	
 
 	@Override
 	public int hashCode() {
@@ -66,6 +68,12 @@ public class Contributor extends Creator {
 			return false;
 		return true;
 	}
+
+
+	public Contributor(Type type) {
+		super();
+		this.type = type;
+	}
 	
 	
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Creator.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Creator.java
index 9c24417..38a3755 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Creator.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Creator.java
@@ -7,12 +7,18 @@ import lombok.RequiredArgsConstructor;
 
 @Data
 @NoArgsConstructor
-@RequiredArgsConstructor
+//@RequiredArgsConstructor
 public class Creator {
 
-	@NonNull
+//	@NonNull
 	private String name;
 	private String affiliation;
 	private String orcid;
 	private String gnd;
+	public Creator(String name) {
+		super();
+		this.name = name;
+	}
+	
+	
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DateInterval.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DateInterval.java
index 8e3a6bb..6e4564b 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DateInterval.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DateInterval.java
@@ -15,8 +15,9 @@ public class DateInterval {
 
 	private Date start;
 	private Date end;
-	@NonNull
+//	@NonNull
 	private Type type;
 	private String description;
 
+	
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DepositionMetadata.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DepositionMetadata.java
index ebe7095..d816243 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DepositionMetadata.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/DepositionMetadata.java
@@ -12,7 +12,7 @@ import lombok.RequiredArgsConstructor;
 
 @Data
 @NoArgsConstructor
-@RequiredArgsConstructor
+//@RequiredArgsConstructor
 public class DepositionMetadata {
 
 	public static enum UploadType{
@@ -64,20 +64,20 @@ public class DepositionMetadata {
 		closed
 	}
 	
-	@NonNull
+//	@NonNull	
 	private UploadType upload_type;
 	private PublicationType publication_type; 
 	private ImageType image_type; 
-	@NonNull
+//	@NonNull
 	@JsonFormat(pattern = Commons.ISO_DATE_PATTERN)
 	private Date publication_date;
-	@NonNull
+//	@NonNull
 	private String title;
-	@NonNull
+//	@NonNull
 	private List<Creator> creators;
-	@NonNull
+//	@NonNull
 	private String description; // TODO HTML
-	@NonNull
+//	@NonNull
 	private AccessRights access_right;
 	private String license; // TODO ENUM https://licenses.opendefinition.org/licenses/groups/all.json
 	@JsonFormat(pattern = Commons.ISO_DATE_PATTERN)
@@ -117,4 +117,17 @@ public class DepositionMetadata {
 	private List<DateInterval> dates;
 	private String method; //TODO html
 	
+	public DepositionMetadata(UploadType upload_type, Date publication_date, String title, List<Creator> creators,
+			String description, AccessRights access_right) {
+		super();
+		this.upload_type = upload_type;
+		this.publication_date = publication_date;
+		this.title = title;
+		this.creators = creators;
+		this.description = description;
+		this.access_right = access_right;
+	}
+
+	
+	
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Grant.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Grant.java
index 2abd426..213d7f2 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Grant.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Grant.java
@@ -8,6 +8,6 @@ import lombok.NonNull;
 @NoArgsConstructor
 public class Grant {
 
-	@NonNull
+//	@NonNull
 	private String id;
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Location.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Location.java
index 1dba798..713606d 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Location.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Location.java
@@ -10,7 +10,7 @@ public class Location {
 
 	private Double lat;
 	private Double lon;
-	@NonNull
+//	@NonNull
 	private String place;
 	private String description;
 	
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/RelatedIdentifier.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/RelatedIdentifier.java
index 94d7155..b609e2a 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/RelatedIdentifier.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/RelatedIdentifier.java
@@ -7,7 +7,7 @@ import lombok.RequiredArgsConstructor;
 
 @Data
 @NoArgsConstructor
-@RequiredArgsConstructor
+//@RequiredArgsConstructor
 public class RelatedIdentifier {
 
 	public static enum Relation{
@@ -25,9 +25,16 @@ public class RelatedIdentifier {
 		isAlternateIdentifier
 	}
 	
-	@NonNull
+//	@NonNull
 	private String identifier;
-	@NonNull
+//	@NonNull
 	private Relation relation;
+	public RelatedIdentifier(String identifier, Relation relation) {
+		super();
+		this.identifier = identifier;
+		this.relation = relation;
+	}
+
+	
 	
 }
diff --git a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Subject.java b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Subject.java
index 79e9a30..6197648 100644
--- a/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Subject.java
+++ b/src/main/java/org/gcube/data/publishing/ckan2zenodo/model/zenodo/Subject.java
@@ -8,10 +8,17 @@ import lombok.NonNull;
 @NoArgsConstructor
 public class Subject {
 
-	@NonNull
+//	@NonNull
 	private String term;
-	@NonNull
+//	@NonNull
 	private String identifier;
 	private String scheme;
+	public Subject(String term, String identifier) {
+		super();
+		this.term = term;
+		this.identifier = identifier;
+	}
+	
+	
 	
 }