You are performing a get by key in a HashMap, but the element is not found, even though you are sure that this pair was inserted. How can this happen?
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Java
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What is the difference between Primary Key and Unique Key?
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What are prototype beans used for in Spring? Provide an example of usage.
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How does the XOR gateway work in BPMN 2.0?
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Tell us about the Bridge pattern — what is it for and how does it work?
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How does the Inclusive gateway work in BPMN 2.0?
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How to guarantee atomicity of writing to a database and sending an event to Kafka (Transactional Outbox pattern)?
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How do you understand the term 'Inversion of Control'?
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Have you ever optimized SQL queries? How do you use EXPLAIN ANALYZE?
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How should string variables be compared in Java?
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What are Stream API used for? What advantages did they add?
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How does the message receiving mechanism work in Kafka consumer? Where is the offset stored?
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What is the purpose of Group ID in Kafka consumer?
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Does Postgres support the READ UNCOMMITTED isolation level? What happens if it is specified in @Transactional?
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Can you inherit from enum, i.e., extend enum?
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What is the difference between rebase and merge in Git?
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What is the complexity of the insert (put) algorithm in TreeMap?
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What are the pitfalls of setter injection?
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What bean injection methods do you know in Spring?
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What will happen if the scheduler sends an event to Kafka but crashes before marking the record in the outbox as sent?
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