Reasons

• Really easy to use and learn. Only two classes and one exception type.
• No need to read a lot of documentation.
• Lean and fast library.
• Real-world, practical and simple API.
• Simple application code that is easy to write, understand and maintain.
• Based on standards: uses SQL as the query language.
• Significantly simplifies the application code.
• No need to write boilerplate code.
• No need to write any exception handling code if you don't want to.
• Prevents bugs, because most of the code can be checked at compile time.
• No need to maintain any XML, config files or Javadoc tags.
• Does not require a special build process.
• Open Source: free, and no dependency on a company to maintain it.
• Apache style license: no problems integrating it into any application.
• Clean, compact, and well documented source code.
• Can be combined with JDBC / SQL code if required (for example, to use database specific optimizations).