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• Very fast, open source, JDBC API
• Embedded and server modes; disk-based or in-memory databases
• Transaction support, multi-version concurrency
• Browser based Console application
• Encrypted databases
• Fulltext search
• Pure Java with small footprint: around 2.5 MB jar file size
• ODBC driver

More information:https://h2database.com

Download latest version or add topom.xml:

<dependency>    <groupId>com.h2database</groupId>    <artifactId>h2</artifactId>    <version>2.4.240</version></dependency>

• Tutorial
• SQL commands
• Functions,aggregate functions,window functions
• Data types

• Issue tracker for bug reports and feature requests
• Mailing list / forum for questions about H2
• 'h2' tag on Stack Overflow for other questions (Hibernate with H2 etc.)