Exception with spring tool - spring

Question

I want to run a simple program with spring tool, but I get so many Exceptions.
1-Application.java
spring.datasource.url=jdbc:mysql://localhost:3306/springbootfirstapp
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=update
2-CustomerController.java
package springbootfirstapp.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import springbootfirstapp.domain.Customer;
import springbootfirstapp.repo.CustomerRepo;
#RestController
#RequestMapping("/customer")
public class CustomerController {
#Autowired
CustomerRepo rp;
#RequestMapping("/findall")
#ResponseBody
public List<Customer> findall(){
return rp.findAll();
}
}
3-Customer.java
package springbootfirstapp.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
#Entity
public class Customer {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
private int phone;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPhone() {
return phone;
}
public void setPhone(int phone) {
this.phone = phone;
}
public Customer(int id, String name, int phone) {
super();
this.id = id;
this.name = name;
this.phone = phone;
}
public Customer() {
super();
}
}
4-CustomerRepo.java
package springbootfirstapp.repo;
import org.springframework.data.jpa.repository.JpaRepository;
import springbootfirstapp.domain.Customer;
public interface CustomerRepo extends JpaRepository<Customer, Integer> {
}
5-application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/springbootfirstapp
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=update
6-I add to pom.xml
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.5</version>
</dependency>
so I am getting the Exception below.
Exception in thread "main" java.lang.StackOverflowError
at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:39)
at org.apache.log4j.LogManager.getLogger(LogManager.java:45)
-------
note: DataBase (springtoolfirstapp) content table (customer) content 3 fields (id-name-phone)
and I create with MySQL workbench..
Please help me. I have tried different approaches and they did not succeed..