Testing Spring Boot Applications
Executive Summary: Most Spring Boot testing is plain JUnit 5 and Mockito: build the service directly and mock its dependencies. Here I show when to boot…
Category
Java
This Java programming series goes from first classes to production Spring Boot apps. It has more than seventy posts, so it works as a full course.
Early posts cover the language and collections. Later, JDBC fundamentals and JPA and Hibernate add data access. Finally, testing Spring Boot apps ties it all together.
74 articles
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Spring Security Basics
Executive Summary: Spring Security basics rest on two questions: authentication checks who is calling, and authorization decides what…
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Validation and Exception Handling in Spring Boot
Executive Summary: Bean Validation lets you put constraints like @NotNull, @Size, and @Email on fields and check them…
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HTTP, REST, and JSON in Java
Executive Summary: Java’s built-in HttpClient handles HTTP calls, and Jackson’s ObjectMapper turns JSON into records and back. I…
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Repository Pattern in Plain Java
Executive Summary: The repository pattern puts data access behind a domain-named interface, with an in-memory implementation for fast…
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JPA and Hibernate Fundamentals
Executive Summary: JPA and Hibernate replace hand-written row mapping with mutable entities managed by an EntityManager. I cover…
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Building a CRUD App with JDBC
Executive Summary: This hands-on project builds a book catalog CRUD app with plain JDBC, H2, and a small…
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Connection Pools and Transactions in Java
Executive Summary: Production JDBC needs a connection pool and explicit transactions. I show how to configure HikariCP and…
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JDBC Fundamentals: Connections, Statements, and ResultSets
Executive Summary: JDBC is a standard interface over vendor drivers, built on Connection, PreparedStatement, and ResultSet. Here I…
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CI Basics for Java: GitHub Actions from Scratch
Executive Summary: A Java CI pipeline on GitHub Actions starts with one workflow file that checks out the…
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Debugging Java Applications: IDE, Remote, and Techniques
Executive Summary: Debugging Java follows one loop: reproduce, isolate, form one hypothesis, and verify it with evidence. Here…
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Logging in Java: SLF4J, Logback, and Best Practices
Executive Summary: Java logging works best with SLF4J as the facade and Logback as the engine, so levels…
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Writing Good Tests: Patterns, Fixtures, and Anti-Patterns
Executive Summary: Good tests follow the test pyramid: many fast unit tests, fewer integration tests, and a thin…
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Mockito: Mocking, Stubbing, and Verifying
Executive Summary: Mockito lets you replace a class’s dependencies with mocks, stub their responses, and verify the calls…
