[java] Spring Boot default H2 jdbc connection (and H2 console)

I am simply trying to see the H2 database content for an embedded H2 database which spring-boot creates when I don't specify anything in my application.properties and start with mvn spring:run. I can see hibernate JPA creating the tables but if I try to access the h2 console at the URL below the database has no tables.

http://localhost:8080/console/

I see suggestions like this one: View content of embedded H2 database started by Spring

But I don't know where to put the suggested XML in spring-boot and even if I did, I don't want the h2console to be available anymore when an external database is configured so it is more likely that I need to handle this with some kind of conditional code (or maybe just allow spring to automatically handle it in the most ideal case where I only include H2 when a maven profile is activated).

Does anyone have some sample code showing how to get the H2 console working in boot (and also the way to find out what the jdbc connection string that spring is using is)?

Check spring application.properties

spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE

here testdb is database defined Make sure h2 console have same value while connecting other wise it will connect to default db

I have found a nice tutorial about this topic:

https://springframework.guru/using-the-h2-database-console-in-spring-boot-with-spring-security/

Basically the correct JDBC URL for me was: jdbc:h2:mem:testdb

For Spring Boot 2.1.1 straight from Spring Initialzr:

1. Default with devtools is http://127.0.0.1:8080/h2-console/

   • POM: spring-boot-starter, h2, spring-boot-starter-web, spring-boot-devtools

2. Without devtools - you need to set it in properties: spring.h2.console.enabled=true spring.h2.console.path=/h2-console

   • POM: spring-boot-starter, h2, spring-boot-starter-web

Once you get there - set JDBC URL: jdbc:h2:mem:testdb (The default one will not work)

I had only below properties in /resources/application.properties. After running spring boot, using this URL(http://localhost:8080/h2-console/), the table in H2 console was visible and read to view the table data, also you can run simple SQL commands. One thing, in your java code, while fetching data, the column names are upper-case, even though schema.sql is using lower-case names :)

spring.datasource.initialize=true
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=- 1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.h2.console.enabled=true

I found that with spring boot 2.0.2.RELEASE, configuring spring-boot-starter-data-jpa and com.h2database in the POM file is not just enough to have H2 console working. You must configure spring-boot-devtools as below. Optionally you could follow the instruction from Aaron Zeckoski in this post

  <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
 </dependency>

In order to get the tables all you need to do is create 2 sql files schema.sql(for table creation) and data.sql(data for the created tables). These files to be put in src/main/resources folder. Spring boot auto detects them and takes care of the rest during runtime.

If your using more than 2 DB in your project ensure to use specific files like (schema-h2.sql -- for h2 DB , schema-oracle.sql -- for oracle DB). The same to be followed for data.sql too.

Also ensure that you drop tables by adding drop table statement in your schema.sql as first statement. To avoid appending of duplicate records.

The link for spring boot is here.

My application.properties is as follows.

spring.datasource.url=jdbc:h2:~/file/Shiva;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.platform=h2
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.datasource.initialize=true 
spring.error.whitelabel.enabled=true
spring.h2.console.path=/console
spring.datasource.continue-on-error=true
spring.jpa.hibernate.ddl-auto=create
spring.hibernate.hbm2ddl.auto=update
spring.hibernate.show_sql=true

You can follow the steps in the below link.

https://springframework.guru/using-the-h2-database-console-in-spring-boot-with-spring-security/

From http://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html

H2 Web Console (H2ConsoleProperties):

spring.h2.console.enabled=true //Enable the console.
spring.h2.console.path=/h2-console //Path at which the console will be available.

Adding the above two lines to my application.properties file was enough to access the H2 database web console, using the default username (sa) and password (empty, as in don't enter a password when the ui prompts you).

A similar answer with Step by Step guide.

1. Add Developer tools dependency to your pom.xml or build.gradle

Maven

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
</dependencies>

Gradle

dependencies {
    compile("org.springframework.boot:spring-boot-devtools")
}

2. Access the db from http://localhost:8080/h2-console/
3. Specify jdbc:h2:mem:testdb as JDBC URL
4. You should see the entity you specified in your project as a table.

I had made a very stupid mistake when I had this same problem. I had added H2 DB for running unit test cases and hence I had set the scope to test in pom.xml. While running the application using mvn spring:run I removed the scope and it works fine now.

If you use Spring Boot's developer tools, it comes with H2 Console enabled by default. It can be accessed from /h2-console/. On the login interface, for input JDBC URL use value jdbc:h2:mem:testdb. Pay attention to mem string.

If you don't use Spring Boot's developer tools, you can enable the console in application.properties using spring.h2.console.enabled=true. This will enable console under /h2-console. If you want to change the URL then you can add another entry with spring.h2.console.path=my_console_path.

The default schema name is testdb.

More details in Spring Boot Documentation.

For Spring Boot 2.3.3.RELEASE straight from Spring Initialzr:

POM: data jpa, h2, web

application properties: spring.h2.console.enabled=true

When you run the application look for line like below in the run console:

2020-08-18 21:12:32.664  INFO 63256 --- [           main] o.s.b.a.h2.H2ConsoleAutoConfiguration    : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:eaa9d6da-aa2e-4ad3-9e5b-2b60eb2fcbc5'

Now use the above JDBC URL for h2-console and click on Connect.

As of Spring Boot 1.3.0.M3, the H2 console can be auto-configured.

The prerequisites are:

• You are developing a web app
• Spring Boot Dev Tools are enabled
• H2 is on the classpath

Even if you don't use Spring Boot Dev Tools, you can still auto-configure the console by setting spring.h2.console.enabled to true

Check out this part of the documentation for all the details.

Note that when configuring in this way the console is accessible at: http://localhost:8080/h2-console/

Use jdbc:h2:mem:testdb as your path when logging into the H2 console.

Obviously if you have altered Spring Boot properties your datasource may be different, but it seems like you're struggling with how to find the default. That's all there is to it! You'll see your schema after logging in to H2.