Andrea Boriero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-15453 ( https://hibernate.atlassian.net/browse/HHH-15453?atlOrigin=eyJpIjoiN2NmMT... ) Re: java.lang.NullPointerException: Cannot invoke "org.hibernate.engine.spi.EntityEntry.getEntityKey()" because "ownerEntry" is null ( https://hibernate.atlassian.net/browse/HHH-15453?atlOrigin=eyJpIjoiN2NmMT... ) Hi Puhong You ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) , I tried to reproduce your error with the code you provided but without any success. This is the test i created @DomainModel( annotatedClasses = { FetchModeSubselectTest.User.class, FetchModeSubselectTest.Role.class } ) @SessionFactory @TestForIssue(jiraKey = "HHH-15453" ) public class FetchModeSubselectTest { @BeforeEach public void setUp(SessionFactoryScope scope) { scope.inTransaction( session -> { User user = new User(); user.setUserId( 1 ); user.setUserName( "Ann" ); User user2 = new User(); user2.setUserId( 2 ); user2.setUserName( "Bob" ); Role manager = new Role(); manager.setRoleId( 1 ); manager.setRoleName( "manager" ); Role developer = new Role(); developer.setRoleId( 2 ); developer.setRoleName( "developer" ); session.persist( user ); session.persist( user2 ); session.persist( manager ); session.persist( developer ); user.addRole( manager ); } ); } @Test public void testSelect(SessionFactoryScope scope) { scope.inSession( session -> { List<User> userList = session.createQuery( "FROM User WHERE userId = 2" , User.class ).list(); assertThat( userList.size() ).isEqualTo( 1 ); assertThat( userList.get( 0 ).getRoles().size() ).isEqualTo( 0 ); } ); } @Entity(name = "User" ) @Table(name = "USER_TABLE" ) public static class User { private Integer userId = null ; private String userName = null ; private Set<Role> roles = null ; @Id @Column(name = "USER_ID" ) public Integer getUserId() { return userId; } public void setUserId( Integer userId) { this.userId = userId; } @Column(name = "USER_NAME" ) public String getUserName() { return userName; } public void setUserName( String userName) { this.userName = userName; } @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER) @JoinTable( name = "USER_ROLE" , joinColumns = @JoinColumn(name = "USER_ID" ), inverseJoinColumns = @JoinColumn(name = "ROLE_ID" )) @Fetch(FetchMode.SUBSELECT) public Set<Role> getRoles() { return roles; } public void setRoles(Set<Role> roles) { this.roles = roles; } public void addRole(Role role) { if ( roles == null ) { roles = new HashSet<>(); } roles.add( role ); } @Override public boolean equals( Object o) { if ( this == o ) { return true ; } if ( o == null || getClass() != o.getClass() ) { return false ; } User user = (User) o; return Objects.equals( userId, user.userId ) && Objects.equals( userName, user.userName ) && Objects.equals( roles, user.roles ); } @Override public int hashCode() { return Objects.hash( userId, userName, roles ); } } @Entity(name = "Role" ) @Table(name = "ROLE_TABLE" ) public static class Role { private Integer roleId = null ; private String roleName = null ; @Id @Column(name = "ROLE_ID" ) public Integer getRoleId() { return roleId; } public void setRoleId( Integer roleId) { this.roleId = roleId; } @Column(name = "ROLE_NAME" ) public String getRoleName() { return roleName; } public void setRoleName( String roleName) { this.roleName = roleName; } @Override public boolean equals( Object o) { if ( this == o ) { return true ; } if ( o == null || getClass() != o.getClass() ) { return false ; } Role role = (Role) o; return Objects.equals( roleId, role.roleId ) && Objects.equals( roleName, role.roleName ); } @Override public int hashCode() { return Objects.hash( roleId, roleName ); } } } am I missing something? ( https://hibernate.atlassian.net/browse/HHH-15453#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15453#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100204- sha1:f005d5a )