Spring Boot + IntelliJ + Embedded Database = Headache

Question

Either I\'m missing some core concept buried deep within some documentation (Spring, Spring Boot, H2, HSQLDB, Derby, IntelliJ) or I\'ve been staring at this for too long.

Answer 1

Using the example here to expose an in-memory DB via console and TCP I was able to connect using H2 Console and IntelliJ client as per screenshots.

https://stackoverflow.com/a/52949164/2930427

Connect using IntelliJ - jdbc:h2:tcp://localhost:9092/mem:default

Connect using H2 Console: jdbc:h2:mem:default

Example application.yml

spring:
  application:
    name: example-service
  r2dbc:
    url: r2dbc:pool:h2:mem:///default?options=DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
    username: testuser
    password: testpass
    pool:
      initial-size: 100
      max-size: 500
      max-idle-time: 30m
      validation-query: SELECT 1

Answer 2

H2 Automatic Mixed Mode should be fine for you. Use jdbc:h2:~/mydbInHomeDir;AUTO_SERVER=TRUE as your spring.datasource.url. In IntelliJ, create a remote H2 data source and use the exact same JDBC URL. You may have to explicitly press the Synchronize button in the IntelliJ Database window to get the database tables to show up.

Answer 3

I had similar problem. It was due to the default create-drop ddl strategy of the hibernate. With this strategy after the application shutdown hibernate destroys the schema at the end of the session, that's why IntelliJ don't show anything. Change ddl strategy to the create and hibernate will create the schema and destroy previous data on the next application startup.

Here is an example of my configuration:

application.yml

spring:
  datasource.url: jdbc:h2:./db/testDb
  jpa.hibernate.ddl-auto: create

IntelliJ database properties

Result

Answer 4

If you follow the steps in this article: https://techdev.io/en/developer-blog/querying-the-embedded-h2-database-of-a-spring-boot-application

I think it will provide the help in getting a Spring Boot application with H2 in-memory database exposed via a tcp server such that you can use the IntelliJ database client to connect to it.

Answer 5

To add to what heenenee mentioned above. If you dont specify AUTO_SERVER only one connection will be permitted to your H2 instance.

I am using spring-boot with spring-data-jpa. Make sure you have @Entity declared for your entities that represent each table(s).

Following is my application.yml / application.properties

spring.datasource.url: 
jdbc:h2:file:/Users/blah[![enter image description here][1]][1]/db/vlad4;AUTO_SERVER=TRUE
spring.datasource.username: sa
spring.datasource.password:

spring:
  jpa:
    hibernate:
      ddl-auto: create #will create schema based on entities
    show-sql: true

Start your application and import some data into it. Spring boot will automatically import your data if you have import.sql in the classpath ex: /src/main/resources/import.sql

Configure you IntelliJ like so

If you are not using IntelliJ download the server/client combo @ http://www.h2database.com/html/download.html extract it and start the browser-based client using:

h2/bin: java -cp h2*.jar org.h2.tools.Server

Connect to your imbedded database by specifying the connection string: