replace

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/customer/Customer.java

@@ -1,37 +0,0 @@
-package com.baeldung.customer;
-
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.Id;
-
-@Entity
-public class Customer {
-
-    @Id
-    @GeneratedValue
-    private long id;
-    private String name;
-    private String email;
-
-    public Customer(String name, String email) {
-        this.name = name;
-        this.email = email;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public String getEmail() {
-        return email;
-    }
-
-    public void setEmail(String email) {
-        this.email = email;
-    }
-
-}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/customer/CustomerRepository.java

@@ -1,18 +0,0 @@
-package com.baeldung.customer;
-
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
-import org.springframework.data.repository.query.Param;
-
-import java.util.List;
-
-public interface CustomerRepository extends JpaRepository<Customer, Long> {
-
-    List<Customer> findByName(String name);
-
-    List<Customer> findByNameAndEmail(String name, String email);
-
-    @Query("SELECT c FROM Customer c WHERE (:name is null or c.name = :name) and (:email is null or c.email = :email)")
-    List<Customer> findCustomerByNameAndEmail(@Param("name") String name, @Param("email") String email);
-
-}