Is data.sql disabled in spring boot 2.3.1.RELEASE?

Question

@SpringBootApplication
public class DatabaseDemoApplication  implements CommandLineRunner  {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    PersonJbdcDao dao;

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

    @Override
    public void run(String... args) throws Exception {
//      Thread.sleep(1000);  --------------------------------------------------> line 1
        logger.info("All users -> {}", dao.findAll());
    }
}

@Repository
public class PersonJbdcDao {
    @Autowired
    JdbcTemplate jdbcTemplate;

    public List<Person> findAll() {
        return jdbcTemplate.query("select * from person", 
                new BeanPropertyRowMapper<Person>(Person.class));
    }
}

In pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
</parent>

I am using h2 database. Following is the application.properties

spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=

Person.class

private int id;
private String name;
private String location;
private Date birthDate;

// getter and setter

I also have a data.sql file in the resources folder which have create and insert statements. If i keep line 1(Thread.sleep(1000)) commented and run the project I'm facing an error but I am able to access table Person via h2 console

java.lang.IllegalStateException: Failed to execute CommandLineRunner
Caused by: org.springframework.jdbc.BadSqlGrammarException: StatementCallback; bad SQL grammar [select * from person]; nested exception is org.h2.jdbc.JdbcSQLSyntaxErrorException: Table "PERSON" not found; SQL statement:
select * from person [42102-200]
Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException: Table "PERSON" not found; SQL statement:
select * from person [42102-200]

I have 2 scenarios

1. If I keep line 1 commented and rename data.sql file to schema.sql file everything works perfect. I'm able to access why is that?
2. If I keep data.sql file and don't rename it I have to uncomment line 1 to get application working. Why is that?

Answer 1

Since Spring Boot 2.3, JPA repository initialization is "deferred" . So run method runs before initialized it (if you don't define any JPA repositories).

If set

spring.data.jpa.repositories.bootstrap-mode=default

on application.properties , run as you expected.

see also:

• 9.10.3. Initialize a Database using basic SQL scripts

---

DataSourceInitializerInvoker javadoc says:

Bean to handle DataSource initialization by running schema-*.sql on InitializingBean#afterPropertiesSet() and data-*.sql SQL scripts on DataSourceSchemaCreatedEvent .

, and DataSourceSchemaCreatedEvent says:

This happens when schema-*.sql files are executed or when Hibernate initializes the database.

So, on first scenario, data.sql is executed after JPA(Hibernate) initialization, but it is "deferred". On the other hand, schema.sql is executed before run() , same as earlier version.