I have a HttpFilter (Added before AbstractPreAuthenticatedProcessingFilter) that is supposed to write a mock user to a database. However, it is seemingly silently failing (The repository save call returns the new user, but nothing is persisted to the database). Making this call outside of the filter context works without issue.

@Component
@RequiredArgsConstructor
public class MockUserFilter extends HttpFilter {

    private final PlayerRepository playerRepository;
    private final EntityManager entityManager;

    @Override
    protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        String userId = request.getHeader("X-Mock-User");
        if (userId != null) {
            DiscordUser user = createMockUser(userId);
            SecurityContextHolder.getContext().setAuthentication(new OAuth2AuthenticationToken(
                    user,
                    user.getAuthorities(),
                    user.getId()
            ));
            updateOrCreatePlayer(user); //This was a call to a service, but put here to test jpa.
        }
        chain.doFilter(request, response);
    }

    private DiscordUser createMockUser(String userId) {
        return new DiscordUser(null, new HashMap<>() {{
            put("id", userId);
            put("username", userId);
        }});
    }
}

I have tried adding transaction management, using flush etc.
Here is the player entity for reference:

@Entity
@Getter
@Setter
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@NoArgsConstructor
public class Player {

    @Id
    @EqualsAndHashCode.Include
    private String id;

    @Column(nullable = false)
    private String username;

    @Column(nullable = false)
    private String avatar;

    @ManyToMany
    @JoinTable(
            name = "player_followers",
            joinColumns = { @JoinColumn(name = "follower_id") },
            inverseJoinColumns = { @JoinColumn(name = "following_id") }
    )
    private Set<Player> following;

    @ManyToMany(mappedBy = "following")
    private Set<Player> followers;
}

Is it possible perhaps to enable detailed logging for repository operations?

At a bit of a loss with where to go from here, any advice is appreciated.