move jmapper to libraries-data

libraries-data/src/main/java/com/baeldung/jmapper/relational/User.java

@@ -0,0 +1,49 @@
+package com.baeldung.jmapper.relational;
+
+import com.googlecode.jmapper.annotations.JMap;
+
+
+public class User {
+    
+    @JMap(classes = {UserDto1.class, UserDto2.class})
+    private long id;    
+    
+    @JMap(attributes = {"username", "email"}, classes = {UserDto1.class, UserDto2.class})
+    private String email;
+    
+    // constructors
+    
+    public User() {
+        super();
+    }
+    
+    public User(long id, String email) {
+        super();
+        this.id = id;
+        this.email = email;
+    }
+
+    // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "User [id=" + id + ", email=" + email + "]";
+    }
+    
+}