Override toString method of User class to return JSON output.

src/main/java/cm/soungui/guacamole/ext/wallix/sync/db/User.java

@@ -51,5 +51,16 @@ public class User extends Entity {
 	public void setOrganization(String organization) {
 		this.organization = organization;
 	}
+	
+	@Override
+	public String toString() {
+		StringBuffer output = new StringBuffer();
+		output.append("{id: ").append(getId())
+		.append(", name: ").append(getName())
+		.append(", full_name: ").append(getFullName())
+		.append(", disabled: ").append(isDisabled())
+		.append("}");
+		return output.toString();
+	}
 
 }