spring boot application showing ??? characters instead of unicode

Question

While reading from database the logs in my dao class shows junk characters in place of unicode characters. Sql developer shows correct values from oracle database also correct NLS language encoding is set on the database.

Below code works for standard jdbc:

connection = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:xe", "adminuser", "oracle");
Statement st=connection.createStatement();
ResultSet res=st.executeQuery("SELECT menu_item_name from pending_menu_item 
where menu_item_id=6062");

    while(res.next()){
        System.out.println("itemName: "+res.getString(1));
    }

Below is the url for springboot project which shows junk characters, I uploaded to git hub.https://github.com/AyubOpen/spring-boot-jdbc/

package com.mkyong;

import com.mkyong.dao.CustomerRepository;
import com.zaxxer.hikari.HikariDataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;
import javax.sql.DataSource;
import java.util.List;
import static java.lang.System.exit;

@SpringBootApplication
public class SpringBootConsoleApplication implements CommandLineRunner {

@Autowired
DataSource dataSource;

@Autowired
private CustomerRepository customerRepository;

@Autowired
private JdbcTemplate jdbcTemplate;

  public static void main(String[] args) throws Exception {
      SpringApplication.run(SpringBootConsoleApplication.class, args);
}

@Override
public void run(String... args) throws Exception {

// If you want to check the HikariDataSource settings
 HikariDataSource newds = (HikariDataSource)dataSource;
  System.out.println("getMaximumPoolSize = " + ((HikariDataSource) 
  dataSource).getMaximumPoolSize());
  System.out.println("DATASOURCE = " + 
  newds.getDataSourceProperties().getProperty("hikari.useUnicode"));

  if (args.length <= 0) {
    System.err.println("[Usage] java xxx.jar {display}");
   } else {
        if (args[0].equalsIgnoreCase("display")) {
        System.out.println("Display items...");
        List<String> list = customerRepository.findAll();
        list.forEach(x -> System.out.println(x));
      }
      System.out.println("Done!");
   }
  exit(0);
 }
}

package com.mkyong.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.List;

@Repository
public class CustomerRepository {

   @Autowired
   private JdbcTemplate jdbcTemplate;

   public List<String> findAll() {

    List<String> result = jdbcTemplate.query(
        "SELECT menu_item_name from pending_menu_item where 
            menu_item_id=6062",
        (rs, rowNum) -> rs.getString("menu_item_name")
    );
  return result;
  }
}

application.properties  
----------------------
spring.main.banner-mode=off
spring.datasource.initialize=true
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.url=jdbc:oracle:thin:@localhost:1521/xe
spring.datasource.username=jahezdbapp
spring.datasource.password=oracle
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver 
spring.datasource.hikari.useUnicode=true
spring.datasource.hikari.characterEncoding=utf-8 
spring.datasource.hikari.characterSetResults=utf8 

# HikariCP settings
#60 sec
spring.datasource.hikari.connection-timeout=60000
# max 5
spring.datasource.hikari.maximum-pool-size=5

Answer 1

1. Add ?useUnicode=yes&characterEncoding=UTF-8 at the end of spring.datasource.url.

2. Set spring.datasource.sqlScriptEncoding=UTF-8 in application.properties

1 itself should solve the issue, 2 may not be necessary.