diff --git a/pom.xml b/pom.xml
index d30872a..42fdfd7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -53,11 +53,6 @@
 			<version>[1.0.0-SNAPSHOT,)</version>
 			<scope>provided</scope>
 		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-api</artifactId>
-			<scope>provided</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.glassfish.jersey.ext</groupId>
 			<artifactId>jersey-bean-validation</artifactId>
@@ -76,6 +71,11 @@
 			<version>${version.jersey}</version>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-api</artifactId>
+			<scope>provided</scope>
+		</dependency>
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
diff --git a/src/main/java/org/gcube/portal/socialnetworking/model/input/ApplicationId.java b/src/main/java/org/gcube/portal/socialnetworking/model/input/ApplicationId.java
index 0d674a5..49648b0 100644
--- a/src/main/java/org/gcube/portal/socialnetworking/model/input/ApplicationId.java
+++ b/src/main/java/org/gcube/portal/socialnetworking/model/input/ApplicationId.java
@@ -17,10 +17,6 @@ public class ApplicationId {
 	@Size(message="app_id cannot be empty", min=1)
 	private String appId;
 
-	public ApplicationId() {
-		super();
-	}
-
 	public ApplicationId(String appId) {
 		super();
 		this.appId = appId;
diff --git a/src/main/java/org/gcube/portal/socialnetworking/model/input/JobNotificationBean.java b/src/main/java/org/gcube/portal/socialnetworking/model/input/JobNotificationBean.java
index 41b9313..71fcbce 100644
--- a/src/main/java/org/gcube/portal/socialnetworking/model/input/JobNotificationBean.java
+++ b/src/main/java/org/gcube/portal/socialnetworking/model/input/JobNotificationBean.java
@@ -42,10 +42,6 @@ public class JobNotificationBean {
 	@JsonProperty("status_message")
 	private String statusMessage;
 	
-	public JobNotificationBean() {
-		super();
-	}
-
 	/**
 	 * @param recipient
 	 * @param jobId
diff --git a/src/main/java/org/gcube/portal/socialnetworking/model/input/MessageInputBean.java b/src/main/java/org/gcube/portal/socialnetworking/model/input/MessageInputBean.java
index 811059c..74b9069 100644
--- a/src/main/java/org/gcube/portal/socialnetworking/model/input/MessageInputBean.java
+++ b/src/main/java/org/gcube/portal/socialnetworking/model/input/MessageInputBean.java
@@ -43,10 +43,6 @@ public class MessageInputBean implements Serializable {
 	@Valid // validate recursively
 	private ArrayList<Recipient> recipients;
 
-	public MessageInputBean() {
-		super();
-	}
-
 	public MessageInputBean(String body, String subject,
 			ArrayList<Recipient> recipients) {
 		super();
diff --git a/src/main/java/org/gcube/portal/socialnetworking/model/input/PostInputBean.java b/src/main/java/org/gcube/portal/socialnetworking/model/input/PostInputBean.java
index 843aa65..ee85f62 100644
--- a/src/main/java/org/gcube/portal/socialnetworking/model/input/PostInputBean.java
+++ b/src/main/java/org/gcube/portal/socialnetworking/model/input/PostInputBean.java
@@ -42,10 +42,6 @@ public class PostInputBean implements Serializable{
 	@JsonProperty("params")
 	private String params;
 
-	public PostInputBean() {
-		super();
-	}
-
 	public PostInputBean(String text, String previewtitle,
 			String previewdescription, String previewhost, String previewurl,
 			String httpimageurl, boolean enablenotification, String params) {
diff --git a/src/main/java/org/gcube/portal/socialnetworking/model/input/Recipient.java b/src/main/java/org/gcube/portal/socialnetworking/model/input/Recipient.java
index 5f59228..5534f0a 100644
--- a/src/main/java/org/gcube/portal/socialnetworking/model/input/Recipient.java
+++ b/src/main/java/org/gcube/portal/socialnetworking/model/input/Recipient.java
@@ -24,9 +24,6 @@ public class Recipient implements Serializable{
 	@Size(min=1, message="recipient id must not be empty")
 	private String id;
 
-	public Recipient() {
-		super();
-	}
 	public Recipient(String id) {
 		super();
 		this.id = id;