Spring boot H2 database not found & not created by Liquibase

Question

I'm trying to create a Spring Boot application with an embedded database (H2) and create data with liquibase on application startup, but absolutely nothing is working.

When I go to http://localhost:8080/h2-console/ and try to log into jdbc:h2:mem:testdb I get

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

Here's my resources/application.properties:

    spring.datasource.url=jdbc:h2:mem:testdb
    spring.datasource.driverClassName=org.h2.Driver
    spring.datasource.username=sa
    spring.datasource.password=
    spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
    
    spring.h2.console.enabled=true
    
    spring.liquibase.change-log=classpath:/db/changelog/changelog-master.xml
    logging.level.liquibase = INFO

Here's my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>test</name>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.4.200</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Answer 1

To configure H2 database automatically with given DB properties in application.properties, H2ConsoleAutoConfiguration class should be fired.

It is not creating your required database testdb , because a dependency spring-boot-starter-data-jpa is missing in your pom.xml, to auto configure the H2 database. Once you add that dependency, your code works well.

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

Once after adding this, you will observe a H2ConsoleAutoConfiguration executed in logs like below

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

Answer 2

Somehow, If you want to connect via console, Spring is unable to create a PHYSICAL file testdb.mv.db in root folder, ie C:/USERS/testdb.mv.db. I went to C:/Users/SHEKHAR, and created a New > text file ( don't save it untill you rename it to testdb.mv.db or test.mv.db. Restart Springboot, "Test Connection" is Green and Connect, takes me to Console GUI.