springboot 2.3.0 while connecting to h2 database

You can fix this by setting the spring.datasource.url property like so:

spring.datasource.url=jdbc:h2:mem:testdb

Prior to Spring Boot 2.3.0-RELEASE this was the default, but I'm not sure where it's set. As of 2.3.0-RELEASE, the schema looks to be a randomly generated GUID.

Step 1. In application.properties:

spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb

Step 2. Start your Spring Boot App and open:

http://localhost:8080/h2-console/

If you still face issue try pasting the URL value which you mentioned in application.properties jdbc:h2:mem:testdb in

JDBC URL of h2-console 

Then you wont face below mentioned issue Database h2 not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-200] 90149/90149 (Help)

Actually, your h2 databse is looking for a file called test.mv.db. But that file was not present in your user directory. So, that it just slapping you and asking you to pre-create it in that path.

Note: That is the root file where our H2 DB store all our information.

1. Add below line in your application.properties file
   spring.datasource.url = jdbc:h2:mem:testdb

2. Go to your user directory, in my case, it is (C:\Users\subra)

3. Create a new file called test.mv.db and saved it under all file option like below.
   
   

4. Now restart your app.

5. Done

Reference Screenshot:

My Problem:

The Result

You are not able to connect to database because you are using old JDBC URL. Every time you start a spring project, JDBC URL changes as well.

Solution: Copy the JDBC URL from console every time you want to connect to a database.

Another reason for the error could be a the missing JDBC dependency:

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

I got the exact same error and this was the issue in my case.

In Spring Boot 2.3.0 the property spring.datasource.generate-unique-name is set to true. This enables the random generation of the schema name.

By setting it to false the database is generated as in previous versions (jdbc:h2:mem:testdb). I find this way preferable, without the need to specify the URL manually.

Create a file with a .mv.db extension in your project's folder. Make sure that the file's name ends with .mv.db otherwise H2 console does not recognize the file (I know it doesn't make sense and I have no explanation why :D). After creating the file, enter jdbc:h2:./devdb to h2 console's JDBC URL like this:

Then you should be OK!

Step 1. Download h2 database engine from here:

https://www.h2database.com/html/main.html

Step 2. In application.properties:

spring.h2.console.enabled=true

spring.datasource.url=jdbc:h2:mem:testdb

Step 3. Start your Spring Boot App and open:

http://localhost:8080/h2-console/

It must be working fine for you.

Since 2.3.0, default value of generate-unique-name is true.

You can revert to the previous behavior by following setting:

spring.datasource.generate-unique-name=false

see also: https://stackoverflow.com/a/62750194/4506703

Even I came across the same set of errors when started learning data persistence with h2 database. The solution is in the console log itself. The database name is auto-generated by and can be found in the spring logs. The reason behind the error is after from 2.3.0 version release onwards if the URL is not mentioned its auto-generated.

Here is the log message which includes database URL: INFO 16096 --- [ restartedMain] o.s.b.a.h2.H2ConsoleAutoConfiguration : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:f1dfeade-60dd-4809-8978-42547353b2f3'

Use h2 dependency with the old version (1.4.192).

<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <version>1.4.192</version>
    <scope>runtime</scope>
</dependency>

In case this helps anybody. My issue was because I have this in my application.properties

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration

Not sure why I added this config before. But once this is taken out, it solves my issue

Adding Spring-boot started JDBC solved my issue.

https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-jdbc/2.5.2

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
    <version>2.5.2</version>
</dependency>

Add property to application.properties:

spring.datasource.generate-unique-name=false

I had also missed adding the following dependencies to pom.xml:

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

I added "test.mv.db" file into "C:\Users\YourUserName" then restart the server and it's worked.

It's error of H2-Database:

Solution -

Let's suppose ~/Test-H-2/Project-X/DB-files path of your project (Database files)

1. create myTest.mv.db file in ~/Test-H-2/Project-X/DB-files folder
2. Add jdbc:h2:~/Test-H-2/Project-X/DB-files/myTest to JDBC URL in H2-Database console

OR

simply you can create ~\test.mv.db file & add jdbc:h2:~/test in to JDBC URL in H2-Database console

i had the same problem while creating schema for h2 database in spring version 2.3.0 ...sometimes the database would connect but could not show me my structure of table so i tried chaneging the spring version and it worked like an magic try changeing spring version to 2.1.15.RELEASAE

Replace the default JDBC url of h2-console from application.properties to use JDBC Url=jdbc:h2:mem:testdb Below is the application.properties

spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=user
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true 

I had same issue in windows 10. Try to replace

spring.datasource.url=jdbc:h2:~/testdb

with

spring.datasource.url=jdbc:h2:mem:testdb

Add these two properties in application.property file

spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testdb

type url: localhost:<portnumber>/h2-console in browser You will get a page regrading login database Remove existing JDBC url in the page and put this jdbc:h2:mem:testdb

I connect h2 by jdbc:h2:mem:testdb but not jdbc:h2:~/testdb

I had the same problem and I got it solved this way

1. Go to application.properties
2. Add the following :

spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

now you can use sa for username and password for password

PS : that's usually the by default configuration that spring boot uses

my solution for this problem is:

in case you you didn't made a database folder in home directory (in windows under the: C:\Users*USERNAME\test* || in Linux: under the: ~/test) make it and add below lines to application.properties:

spring.jpa.hibernate.ddl-auto=create-drop
spring.datasource.url=jdbc:h2:~/test
spring.jpa.hibernate.ddl-auto=create-drop

it should help you to login.

((use blank username and password for H2))

Adding to answers, which mention auto-generated database name in Spring Boot 2.3+ – this is the way how to get the generated name into H2 Console programatically in Spring Boot, so that you can keep the generated database name. It basically gets the first H2 database source and updates/generates the H2 Console configuration file ~/.h2.server.properties, which is then loaded by H2 Console when it is first accessed.

Configure pom.xml to use H2 types directly:

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>compile</scope>
        </dependency>

Enable H2 Console in application.properties (true is a default value):

spring.h2.console.enabled=true

Code to use auto-generated database name:

import java.io.OutputStream;
import java.sql.Connection;
import java.util.List;
import java.util.Objects;
import java.util.Properties;
import java.util.stream.Collectors;

import javax.sql.DataSource;

import org.h2.engine.Constants;
import org.h2.store.fs.FileUtils;
import org.h2.util.SortedProperties;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.context.annotation.Configuration;

@Configuration
@AutoConfigureAfter(DataSourceAutoConfiguration.class)
public class H2ConsoleDatabaseAutoConfigurator {

  @Autowired
  public void configure(ObjectProvider<DataSource> dataSource) throws Exception
  {
    Properties properties = SortedProperties.loadProperties(Constants.SERVER_PROPERTIES_DIR + "/" + Constants.SERVER_PROPERTIES_NAME);

    List<String> urls = dataSource.orderedStream().map((available) -> {
      try (Connection connection = available.getConnection()) {
        if (connection.getMetaData().getURL().startsWith("jdbc:h2:mem:")) {
          return connection.getMetaData().getURL() + "|" + connection.getMetaData().getUserName();
        } else {
          return null;
        }
      }
      catch (Exception ex) {
        return null;
      }
    }).filter(Objects::nonNull).collect(Collectors.toList());

    if (urls.size() > 0)
    {
      for (int i = 0;; i++)
      {
        String value = properties.getProperty(String.valueOf(i), null);
        if (value == null || value.startsWith("Local H2|")) {
          properties.setProperty(String.valueOf(i), "Local H2|org.h2.Driver|" + urls.get(0));
          break;
        }
      }

      OutputStream out = FileUtils.newOutputStream(
          Constants.SERVER_PROPERTIES_DIR + "/" + Constants.SERVER_PROPERTIES_NAME, false);
      properties.store(out, "H2 Server Properties");
      out.close();
    }
  }
}

The console will contain the current H2 name as Local H2 menu entry:

The code is a composite of sources from H2 Console and Spring Boot H2 Console Autoconfiguration.

NOTE:->spring.datasource.url=jdbc:h2:mem:nilesh-->Should be same in console(JDBC URL)

application.properties

spring.h2.console.enabled=true
spring.datasource.platform=h2
spring.datasource.url=jdbc:h2:mem:nilesh

Adding JPA Dependency to pom.xml fixed this error for me.

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

Here is my application.properties file, just for your reference.

spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:mem:testapp
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

I am using Spring 2.7.3. I had the same issue with mem:testdb not found. After trying out all the different solutions I could find in Stackoverflow, the only solution that worked for me was adding both "spring.datasource.url=jdbc:h2:mem:testdb" AND "spring.datasource.generate-unique-name=false" in my application properties file.

I thought that by adding just the "spring.datasource.url=jdbc:h2:mem:testdb" should stop spring from generating unique name everytime I restart the application but apparently not. Manually creating the test.mv file did not work for me either. Hope this helps.

Please use this below solution it's working.

If you are dealing with the Spring Boot project, please change the JDBC URL jdbc:h2:~/test to jdbc:h2:mem:testdb in the login page, which is the default URL configured by Spring Boot.