Spring Boot

Building a REST service with Spring Boot — wired for real data, validated, and fast enough to trust in production.

Spring Boot Essentials

What Boot adds on top of plain Spring, and how to make it do what you want.

What Spring Boot Adds
What Boot changes about starting a Spring application, and how it decides what to create for you.
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Starters and the Embedded Server
One dependency instead of a dozen, and a server that ships inside the jar.
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Configuring a Boot Application
Where a setting comes from, and what wins when two sources disagree.
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Mapping requests, validating input, and handling errors consistently.

Mapping Requests
Turning a URL and a verb into a method call, and a method's return value into a response.
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Validating Input
Refusing a bad request before it reaches your business logic.
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Handling Errors Consistently
One shape for every error response, wherever it comes from.
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Repositories, two persistence models, and what a transaction actually wraps.

Repositories with Spring Data
Asking for data without writing the SQL yourself.
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Spring Data JDBC vs JPA
Two different answers to what an object mapped to a row actually is.
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The JPA Entity Lifecycle
The four states an entity moves through, and the operations that move it.
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Transactions
What `@Transactional` actually wraps, and the two ways it surprises people.
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Skipping work on purpose, and finding the work you didn't mean to be doing.

Caching in Spring Boot
Skipping work you've already done, on purpose, and knowing when to throw the answer away.
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Where a Spring Boot API Gets Slow
Finding the real bottleneck before optimizing the wrong thing.
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