3 pages from the guide: the cover, the contents (75 questions in 7 sections) and one complete question with its answer, code and interview tips.
Testing is where Spring Boot interviews get practical: which annotation loads what, why the context starts ten times, when @Transactional hides a bug, and what to mock. This guide answers 75 questions on test strategy and slices, the web layer, the data layer with real databases in containers, Mockito, JUnit 5 and AssertJ, testing integrations such as REST clients, Kafka and RabbitMQ, and keeping a suite fast, stable and meaningful.
75 questions in 7 sections, 75 code examples in a 97-page PDF (2026 edition).
A 52-page print-friendly guide to the Spring Boot annotations you actually use, with copyable code and interview questions.
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Read a section, then close the guide and explain the answer aloud. For the questions titled "What is wrong with this test?", find the flaw in the snippet before you read the explanation, then compare the fix with the tests in your own project.
save followed by findById inside one transaction returns the same managed instance from the persistence context. No SELECT runs, and with a sequence generator not even the INSERT has run. The test cannot detect a wrong column mapping or a violated constraint. Flush and clear before reading, and use saveAndFlush when you assert on exceptions.
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It covers this topic in depth. It is one topic from the TechTribers Java Interview Series, which has all 23 parts (1,200+ questions) in one bundle.
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500+ curated Spring Boot interview questions by difficulty, with detailed answers, coding challenges and cheat sheets.
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60 Hibernate and Spring Data JPA interview questions: the persistence context, mapping, N+1 and fetching, queries, repositories, transactions and locking.
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