Create an entity that is not a table spring jpa - spring-data-jpa

Question

I'm trying to learn spring boot with JPA. How to create an entity that only has selected columns of a table? I can do this using jdbcTemplate but is it also possible using JPA?
I tried using the SELECT NEW but it gives me a null pointer exception error on the em.createQuery execution. Does it mean I get no results? Can you help me pinpoint my error?
Here is my code :
EntityManager em;
String queryStr =
"SELECT NEW com.lms.app.user.User(c.id.username, c.password, c.emailadd) FROM TBUSER AS c";
TypedQuery<User> query =
em.createQuery(queryStr, User.class);
List<User> results = query.getResultList();
User.class
public class User {
private String name;
private String password;
private String email;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
TBUSER columns looks like this :
username varchar (primary key)
password
emailadd
then more columns here..