H2 数据库是用 spring-boot-starter-data-jpa 创建的，但不是用 spring-boot-starter-data-jdbc 创建的

Question

I am new in Spring. I am trying to work with H2 Database and JDBC (not JPA/Hibernate).

So with Spring Initializr, when i add theses dependencies :

• spring-boot-starter-web
• spring-boot-starter-data-jpa
• h2

and putting this property to true : spring.h2.console.enabled=true

The database mem:testdb is created and i can connect to it at : localhost:8080/h2-console

But when i change the jpa dependency to :

• spring-boot-starter-data-jdbc

The database is not created and I have this error message :

Database "mem:testdb" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-200] 90149/90149 (Help)

So I would like to know why it doesn't work with JDBC, and if you know a solution to make it work.

I found two articles on the web, and it seems they can have the database created with JDBC :

• Integrating Spring Boot and Spring JDBC with H2 and Starter JDBC
• Spring Boot and Spring JDBC With H2

UPDATE :

I tried to do the same thing at home in my personal computer and it works...

I don't know why it doesn't work in job computer although it works with JPA.

In the logs, it is missing these lines :

com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...

com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.

osbah2.H2ConsoleAutoConfiguration : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:testdb'

UPDATE2 :

I found the solution :

As I said, I am using Spring Initializr to bootstrap the project. In the job pc, I was not able to use the last version of Spring boot (2.2.4), so i choosed 2.1.12

Version Spring Boot

With this version, it works with JPA but not with JDBC...

Answer 1

From the documentation

You need a dependency on spring-jdbc for an embedded database to be auto-configured.

spring-boot-starter-data-jpa and spring-boot-starter-data-jdbc gets spring-jdbc transitively through its dependency on spring-boot-starter-jdbc

This means for both these dependencies h2 will be auto-configured.

Update:

For both configurations I am able to access the db with http://localhost:8080/h2-console/

and you will be getting a similar log when spring boot application starts up

2020-02-05 01:27:16.135[0;39m [32m INFO[0;39m [35m55966[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.s.b.a.h2.H2ConsoleAutoConfiguration   [0;39m [2m:[0;39m H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:testdb'

Answer 2

Both links provided by you allow me to create spring boot application with the following dependencies: Web, JDBC, H2, DevTools. If change 'spring-boot-starter-jdbc' dependency to 'spring-boot-starter-data-jpa' everything works the same way, eg H2 database is created and accessible. Make sure you specified the same configuration in both cases in the application.properties file, 'spring.datasource.url' hasn't been changed.

Answer 3

I found the solution :

As I said, I am using Spring Initializr to bootstrap the project. In the job pc, I was not able to use the last version of Spring boot (2.2.4), so i choosed 2.1.12

Version Spring Boot

With this version, it works with JPA but not with JDBC...