StackOverflowError while fetching OneToMany mapped entity in Spring Data Jpa

I have two entities that have bidirectional mapping. The entities are given below,

**Entity 1** @Entity @Table(name = "Customer") public class CustomerEntity implements Serializable { /** The Constant serialVersionUID. */ private static final long serialVersionUID = 1L; /** The id. */ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; /** The first name. */ @Column(name = "FirstName", length = 60, nullable = false) private String firstName; /** The last name. */ @Column(name = "LastName", length = 60, nullable = false) private String lastName; /** The dob. */ @Column(name = "DOB", nullable = false) private LocalDate dob; /** The mobile number. */ @Column(name = "MobileNumber", length = 10, nullable = false, unique = true) private Long mobileNumber; /** The email id. */ @Column(name = "Email", length = 100, nullable = false, unique = true) private String emailId; /** The address. */ @Column(name = "Address", length = 255) private String address; /** The created time. */ @Column(name = "CreatedTime", nullable = false) private LocalDateTime createdTime; /** The accounts. */ @OneToMany(mappedBy = "customerEntity", cascade = CascadeType.ALL) private List<AccountEntity> accountEntities = new ArrayList<>(); // Constructors, getters, setters, hashcode, equals, and toString methods are here @Override public String toString() { return "CustomerEntity [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", dob=" + dob + ", mobileNumber=" + mobileNumber + ", emailId=" + emailId + ", address=" + address + ", createdTime=" + createdTime + ", accountEntities=" + accountEntities + "]"; } } **Entity 2** @Entity @Table(name = "Account") public class AccountEntity implements Serializable { /** The Constant serialVersionUID. */ private static final long serialVersionUID = 1L; /** The id. */ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; /** The account number. */ @Column(name = "AccountNumber", length = 20, nullable = false, unique = true) private String accountNumber; /** The branch. */ @Column(name = "Branch", nullable = false) private String branch; /** The account type. */ @Column(name = "AccountType", nullable = false) private String accountType; /** The balance. */ @Column(name = "Balance", nullable = false) private Double balance; /** The created time. */ @Column(name = "CreatedTime", nullable = false) private LocalDateTime createdTime; /** The account holder. */ @ManyToOne(fetch = FetchType.LAZY) private CustomerEntity customerEntity; // Constructors, getters, setters, hashcode, equals, and toString methods are here @Override public String toString() { return "AccountEntity [id=" + id + ", accountNumber=" + accountNumber + ", branch=" + branch + ", accountType=" + accountType + ", balance=" + balance + ", createdTime=" + createdTime + ", customerEntity=" + customerEntity + "]"; } } 

I need to fetch all the customer entities along with its mapped accounts. My service code looks like this,

public Set<CustomerDTO> fetchCustomers(String searchKey) { List<CustomerEntity> customers = null; if (searchKey == null || searchKey.trim().isEmpty()) { **customers = customerRepository.findAll();** } else { **customers = customerRepository.findByFirstNameContainingIgnoreCaseOrLastNameContainingIgnoreCase(searchKey, searchKey);** } System.out.println(customers); return customers.stream() .map(entity -> new CustomerDTO(entity.getId(), entity.getFirstName(), entity.getLastName(), entity.getDob(), entity.getEmailId(), entity.getMobileNumber(), entity.getAddress(), entity.getCreatedTime())) .collect(Collectors.toSet()); } 

But I am getting StackOverFlowError. The log is mentioned below,

Hibernate: select customeren0_.id as id1_1_, customeren0_.address as address2_1_, customeren0_.created_time as created_3_1_, customeren0_.dob as dob4_1_, customeren0_.email as email5_1_, customeren0_.first_name as first_na6_1_, customeren0_.last_name as last_nam7_1_, customeren0_.mobile_number as mobile_n8_1_ from customer customeren0_ where customeren0_.mobile_number=? or customeren0_.email=? Hibernate: insert into customer (id, address, created_time, dob, email, first_name, last_name, mobile_number) values (null, ?, ?, ?, ?, ?, ?, ?) Hibernate: select customeren0_.id as id1_1_0_, customeren0_.address as address2_1_0_, customeren0_.created_time as created_3_1_0_, customeren0_.dob as dob4_1_0_, customeren0_.email as email5_1_0_, customeren0_.first_name as first_na6_1_0_, customeren0_.last_name as last_nam7_1_0_, customeren0_.mobile_number as mobile_n8_1_0_ from customer customeren0_ where customeren0_.id=? Hibernate: select accountent0_.id as id1_0_, accountent0_.account_number as account_2_0_, accountent0_.account_type as account_3_0_, accountent0_.balance as balance4_0_, accountent0_.branch as branch5_0_, accountent0_.created_time as created_6_0_, accountent0_.customer_entity_id as customer7_0_ from account accountent0_ left outer join customer customeren1_ on accountent0_.customer_entity_id=customeren1_.id where customeren1_.id=? and accountent0_.account_type=? Hibernate: insert into account (id, account_number, account_type, balance, branch, created_time, customer_entity_id) values (null, ?, ?, ?, ?, ?, ?) Hibernate: select customeren0_.id as id1_1_, customeren0_.address as address2_1_, customeren0_.created_time as created_3_1_, customeren0_.dob as dob4_1_, customeren0_.email as email5_1_, customeren0_.first_name as first_na6_1_, customeren0_.last_name as last_nam7_1_, customeren0_.mobile_number as mobile_n8_1_ from customer customeren0_ where upper(customeren0_.first_name) like upper(?) escape ? or upper(customeren0_.last_name) like upper(?) escape ? Hibernate: select accountent0_.customer_entity_id as customer7_0_0_, accountent0_.id as id1_0_0_, accountent0_.id as id1_0_1_, accountent0_.account_number as account_2_0_1_, accountent0_.account_type as account_3_0_1_, accountent0_.balance as balance4_0_1_, accountent0_.branch as branch5_0_1_, accountent0_.created_time as created_6_0_1_, accountent0_.customer_entity_id as customer7_0_1_ from account accountent0_ where accountent0_.customer_entity_id=? [2m2021-09-03 14:26:18.673[0;39m [31mERROR[0;39m [35m5812[0;39m [2m---[0;39m [2m[nio-8080-exec-4][0;39m [36mo.a.c.c.C.[.[.[/].[dispatcherServlet] [0;39m [2m:[0;39m Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.StackOverflowError] with root cause java.lang.StackOverflowError: null at java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:582) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:175) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:87) ~[na:na] at java.base/java.lang.AbstractStringBuilder.<init>(AbstractStringBuilder.java:112) ~[na:na] at java.base/java.lang.StringBuilder.<init>(StringBuilder.java:127) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:245) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.CustomerEntity.toString(CustomerEntity.java:297) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at com.assignment.bank.entities.AccountEntity.toString(AccountEntity.java:247) ~[classes/:na] at java.base/java.lang.String.valueOf(String.java:3365) ~[na:na] at java.base/java.lang.StringBuilder.append(StringBuilder.java:169) ~[na:na] at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:457) ~[na:na] at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:622) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final] 

Can anyone help?? What am I missing here?

UPDATE toString() and log updated. Couldn't add the full log due to size restriction.