Unable to connect to h2 database - spring-boot

Question

I have been trying to integrate h2 DB with spring boot application and I am getting the following error when trying to connect from the h2-console
Database "mem:testdb" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-200] 90149/90149 (Help)
org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "mem:testdb" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-200]
I tried adding the following properties to the application.properties file:
spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driverClassName=org.h2.Driver
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.hibernate.ddl-auto=create
It still does not seem to work.
This is how my build.gradle file looks like
plugins {
id 'org.springframework.boot' version '2.6.3'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
configurations {
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.data:spring-data-jpa'
runtimeOnly 'com.h2database:h2'
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
tasks.named('test') {
useJUnitPlatform()
}

Answer 1

It works as expected if you replace the line
implementation 'org.springframework.data:spring-data-jpa'
with
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
in build.gradle if you make sure that the field JDBC URL in the login mask has the value jdbc:h2:mem:testdb.
You get the correct build.gradle if you use the Spring Initializr and add
Lombok
Spring Data JPA
H2 Database
Spring Web
If you want to add dependencies to a project that was originally created with the Spring Initializr, it's usually a good idea to go back to https://start.spring.io/, add all dependencies, hit the Explore button, and copy & paste the generated build.gradle into the existing project.