<![CDATA[Boot Camp Java - Medium]]> https://medium.com/boot-camp-java?source=rss----8ae4340d85e1---4 https://cdn-images-1.medium.com/proxy/1*TGH72Nnw24QL3iV9IOm4VA.png Boot Camp Java - Medium https://medium.com/boot-camp-java?source=rss----8ae4340d85e1---4 Medium Fri, 13 Nov 2026 21:29:00 GMT <![CDATA[20 Hidden Java Concepts Principal Engineers Know, Each One Run on Java 25]]>

A 9 KB method the JIT never compiles, an NPE that loses its trace, -Xmx32g holding less than 31g: 20 JVM behaviours, run on Java 25.

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]]> https://medium.com/boot-camp-java/20-hidden-java-concepts-principal-engineers-know-each-one-run-on-java-25-3812bbfd6300?source=rss----8ae4340d85e1---4 https://medium.com/p/3812bbfd6300 Thu, 12 Nov 2026 06:58:35 GMT 2026-11-12T06:58:35.527Z <![CDATA[20 Spring Boot Microservices Interview Questions Principal Engineers Should Be Able to Defend]]>

Twenty system-level Spring Boot microservices interview questions for principal engineers, with Spring Boot 4.1 defaults checked in source.

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]]> https://medium.com/boot-camp-java/20-spring-boot-microservices-interview-questions-principal-engineers-should-be-able-to-defend-146ccc027964?source=rss----8ae4340d85e1---4 https://medium.com/p/146ccc027964 Sat, 07 Nov 2026 14:07:44 GMT 2026-11-07T14:07:46.226Z <![CDATA[Spring Boot 4 + Java 25: 10 Things You Should Stop Doing in Your application.yml]]>

timeout: 30 bound as 30 ms, Norway’s country code became false, a typo in a pool size was silently ignored. 10 habits, bound on Boot 4.1.

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]]> https://medium.com/boot-camp-java/spring-boot-4-java-25-10-things-you-should-stop-doing-in-your-application-yml-7e51de2af0f5?source=rss----8ae4340d85e1---4 https://medium.com/p/7e51de2af0f5 Fri, 06 Nov 2026 03:12:23 GMT 2026-11-06T17:35:33.771Z <![CDATA[Spring Boot 4.2: 15 Things That Change When You Upgrade From 4.1,]]>

RestTemplate deprecated, the AMQP starter repurposed, relative redirects, one forwarded header dropped. Each run on 4.1.2 vs 4.2.0-RC1.

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]]> https://medium.com/boot-camp-java/spring-boot-4-2-15-things-that-change-when-you-upgrade-from-4-1-f31bb777caf7?source=rss----8ae4340d85e1---4 https://medium.com/p/f31bb777caf7 Thu, 05 Nov 2026 12:17:55 GMT 2026-11-05T12:17:55.811Z <![CDATA[Split Brain Explained: What Happens When Two Nodes Both Think They Are the Leader]]>

A 4-second GC pause made a second leader in 5 of 5 runs and 50 emails went out twice. Why leases can’t stop it, and the 2 things that do.

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]]> https://medium.com/boot-camp-java/split-brain-explained-what-happens-when-two-nodes-both-think-they-are-the-leader-991ca420ba0c?source=rss----8ae4340d85e1---4 https://medium.com/p/991ca420ba0c Tue, 03 Nov 2026 11:17:50 GMT 2026-11-03T11:17:50.635Z <![CDATA[20 Array and String Interview Problems in Java, Solved by the 5 Patterns Behind Them]]>

Two pointers, sliding window, prefix sums, binary search: 20 problems, all tested. Fruit Into Baskets brute force: 34.9 s; the window: 1…

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]]> https://medium.com/boot-camp-java/20-array-and-string-interview-problems-in-java-solved-by-the-5-patterns-behind-them-061c2ed330f7?source=rss----8ae4340d85e1---4 https://medium.com/p/061c2ed330f7 Sun, 01 Nov 2026 06:21:31 GMT 2026-11-01T06:21:31.698Z <![CDATA[10 Java Traps That Fail a Correct-Looking DSA Solution, Tested on Java 25]]>

Negative modulo, a midpoint that overflows, Integer == above 127: ten Java traps that pass the sample test and fail the hidden one, all…

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]]> https://medium.com/boot-camp-java/10-java-traps-that-fail-a-correct-looking-dsa-solution-tested-on-java-25-b01f65161355?source=rss----8ae4340d85e1---4 https://medium.com/p/b01f65161355 Sat, 31 Oct 2026 10:03:01 GMT 2026-10-31T10:03:01.513Z <![CDATA[Spring Boot 4 + Java 25: 10 Things You Should Stop Doing in Your Spring Security Config]]>

@PreAuthorize without @EnableMethodSecurity let a plain user through. permitAll() in the wrong place opened /admin. 10 habits, tested.

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]]> https://medium.com/boot-camp-java/spring-boot-4-java-25-10-things-you-should-stop-doing-in-your-spring-security-config-97d3b38fda0b?source=rss----8ae4340d85e1---4 https://medium.com/p/97d3b38fda0b Fri, 30 Oct 2026 11:54:16 GMT 2026-10-30T11:54:16.597Z <![CDATA[Spring Boot 4 + Java 25: 10 Things You Should Stop Doing in Your Exception Handling]]>

A catch (Exception e) made shutdown take 5 seconds instead of 0. Returning e.getMessage() leaked the SQL and a customer’s email. A return…

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]]> https://medium.com/boot-camp-java/spring-boot-4-java-25-10-things-you-should-stop-doing-in-your-exception-handling-adcb0a5145a9?source=rss----8ae4340d85e1---4 https://medium.com/p/adcb0a5145a9 Wed, 28 Oct 2026 02:31:59 GMT 2026-10-28T02:32:00.388Z <![CDATA[Advent of Code in Java 25: 10 Language Features That Make Puzzle Solutions Shorter]]>

No class, no static main, sliding windows in one call, a parser the compiler checks, and the computeIfAbsent memo trap. Run on Java 25.

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]]> https://medium.com/boot-camp-java/advent-of-code-in-java-25-10-language-features-that-make-puzzle-solutions-shorter-ea05077e2efe?source=rss----8ae4340d85e1---4 https://medium.com/p/ea05077e2efe Tue, 27 Oct 2026 04:02:23 GMT 2026-10-27T04:02:23.695Z