Hands-On High Performance with Spring 5

Reduction in implementing code

All application classes are simple POJO classes; Spring is not invasive. It does not require you to extend framework classes or implement framework interfaces for most use cases. Spring applications do not require a Jakarta EE application server, but they can be deployed on one.

Before the Spring Framework, typical J2EE applications contained a lot of plumbing code. For example:

• Code for getting a database connection
• Code for handling exceptions
• Transaction management code
• Logging code and a lot more

Let's look at the following simple example of executing a query using PreparedStatement:

PreparedStatement st = null;try {    st = conn.prepareStatement(INSERT_ACCOUNT_QUERY); st.setString(1, bean.getAccountName()); ...