Unable to delete entity using Spring Data Jpa - spring-data-jpa

Question

I have a bi-directional mapping between Customer, Order and LineItems. When trying to delete using deleteById method of Spring Data JPA, the entities are not getting deleted and I do not see any exception.
#Entity
#Table(name = "customers")
#NoArgsConstructor
#AllArgsConstructor
#Builder
#Data
public class Customer implements UserDetails {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#NotEmpty(message = "customer name cannot be empty")
private String name;
#Column(unique = true)
#Email(message = "customer email address should be valid email address")
private String email;
#OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JsonManagedReference
private Set<Order> orders;
private String password;
#Data
#NoArgsConstructor
#Builder
#AllArgsConstructor
#EqualsAndHashCode(exclude = {"customer", "lineItems"})
#ToString(exclude = {"customer", "lineItems"})
#Entity
#Table(name = "orders")
public class Order {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Min(value = 2000, message = "Min order value should be 2000 INR")
#Max(value = 10_000, message = "Max order value can be 10000 INR")
private double price;
#PastOrPresent(message = "Order date cannot be in future")
private LocalDate date;
#ManyToOne
#JoinColumn(name="customer_id", nullable = false)
#JsonBackReference
private Customer customer;
#OneToMany(mappedBy = "order",
cascade = CascadeType.ALL,
fetch = FetchType.LAZY,
orphanRemoval = true
)
private Set<LineItem> lineItems;
//scaffolding code
// set the bidirectional mapping
public void addLineItem(LineItem lineItem){
if(this.lineItems == null){
this.lineItems = new HashSet<>();
}
this.lineItems.add(lineItem);
lineItem.setOrder(this);
}
}
#Data
#NoArgsConstructor
#EqualsAndHashCode(exclude = "order")
#ToString(exclude = "order")
#Builder
#AllArgsConstructor
#Entity
#Table(name="line_items")
public class LineItem {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private int qty;
private double price;
private String name;
#JsonIgnore
#ManyToOne
#JoinColumn(name="order_id", nullable = false)
private Order order;
}
this.orderRepository.deleteById(orderId);
Error:
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.classpath.ordersapi.model.Customer.orders, could not initialize proxy - no Session\r\n\tat org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:612)\r\n\tat org.hibernate.collection.internal