There is a problem bother me for several days.

I ran a Sprint Boot sample (downloaded from https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-data-jpa) in my eclipse IDE, and it started failed.

Caused by: java.lang.IllegalStateException: Cannot load driver class: org.h2.Driver

The log shows load h2 database driver failed.

I checked my pom.xml, and the h2database has been configured.

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

I checked Maven Dependencies in Project explorer, and the h2-1.4.196.jar existed.

I pressed command + shift + T, no class “org.h2.driver” shown.

I searched in baidu and google, and tried many ways, such as:

• Project -> Clean…
• Maven -> Update Project (Right click on my project)

But, it did NOT work!

I entered ~/.m2/repository/com/h2database/h2/1.4.196 and ls, there were a file named h2-1.4.196.jar.

I downloaded the same-named file from http://www.h2database.com/html/cheatSheet.html.

I found the file sizes are different!!!

I realized that the jar file was damaged.

I removed the old file, and moved the new file to the folder, update Maven project.

It finally worked.