在Spring / Hibernate中运行H2嵌入式数据库

Question

I am trying to create an spring boot application utilizing hibernate and h2. From what I have found online this can be done but I am having a problem starting the application. Hibernate is complaining that it cannot make a connection to the h2 database I have created.

Caused by: org.hibernate.HibernateException: Unable to make JDBC Connection [jdbc:h2:~/todo]

My theory is that the application needs to start for the database be available but hibernate is not letting the application start without the connection.

Am I on the right track with this theory, has there been similar issues that someone knows how to get around this?

Hibernate config

**<?xml version="1.0" encoding="UTF-8"?>
<hibernate-configuration>
    <session-factory>
        <!--Database connection settings -->
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:h2:~/todo</property>
        <property name="connection.username">username</property>
        <property name="connection.password" />

        <!--Set the database dialect -->
        <property name="dialect">org.hibernate.dialect.H2Dialect</property>

        <!--Echo all executed SQL to stdout-->
        <property name="show_sql">true</property>

        <!--Drop and re-create the database schema on startup-->
        <property name="hbm2ddl.auto">create</property>

        <!--Name the annotated Entity classes -->
        <mapping class="com.todo.beans.User" />

    </session-factory>
</hibernate-configuration>**

h2 config

import org.h2.server.web.WebServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class WebConfiguration {
    @Bean
    ServletRegistrationBean h2servletRegistration(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean( new WebServlet());
        registrationBean.addUrlMappings("/console/*");
        return registrationBean;
    }
}

Answer 1

change following properties in hibernate config <property name="connection.driver_class">org.h2.Driver</property> <property name="connection.url">jdbc:h2:mem:todo;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE </property>

Problem is with driver class; you may keep url as it is.

Answer 2

This sample project can help you.

https://github.com/dornala/HotelStackoverflow