<![CDATA[Stories by Cem Dırman on Medium]]> https://medium.com/@cemdrman?source=rss-668f1f3dbd5d------2 https://cdn-images-1.medium.com/fit/c/150/150/1*kfrM2yV5lBZrBfQnvofyfQ@2x.jpeg Stories by Cem Dırman on Medium https://medium.com/@cemdrman?source=rss-668f1f3dbd5d------2 Medium Wed, 04 Nov 2026 21:01:45 GMT <![CDATA[The Decorator Pattern in Spring: Wrap a Bean With Caching or Metrics Without Touching It]]>

If you have used Spring’s @Cacheable or built a Strategy map of beans, you already know Spring likes to keep behavior out of your core…

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]]> https://medium.com/@cemdrman/the-decorator-pattern-in-spring-wrap-a-bean-with-caching-or-metrics-without-touching-it-afcfbd1a7536?source=rss-668f1f3dbd5d------2 https://medium.com/p/afcfbd1a7536 Mon, 02 Nov 2026 09:01:02 GMT 2026-11-02T09:01:02.583Z <![CDATA[Your @TransactionalEventListener Is Silently Not Firing]]>

If you are coming from plain @EventListener, you already know the shape: publish an event, a listener reacts, your service stays decoupled…

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]]> https://medium.com/@cemdrman/your-transactionaleventlistener-is-silently-not-firing-df167d8e6ae5?source=rss-668f1f3dbd5d------2 https://medium.com/p/df167d8e6ae5 Fri, 30 Oct 2026 09:01:04 GMT 2026-10-30T09:01:04.325Z <![CDATA[C# & .NET for Java/Spring Developers-3: LINQ vs Java Streams]]>

If you’re coming from Spring Boot, you reach for Stream<T> any time you need to filter, map, or collect a list without writing a for loop…

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]]> https://medium.com/@cemdrman/c-net-for-java-spring-developers-3-linq-vs-java-streams-20bec197c624?source=rss-668f1f3dbd5d------2 https://medium.com/p/20bec197c624 Wed, 28 Oct 2026 09:01:05 GMT 2026-10-28T09:01:05.598Z <![CDATA[C# & .NET for Java/Spring Developers-2]]>

In Part 1 we compared project files and dotnet CLI basics. This time it’s async. If you’ve written a Spring Boot service that fans out to…

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]]> https://medium.com/@cemdrman/c-net-for-java-spring-developers-2-d63cbbe41a9b?source=rss-668f1f3dbd5d------2 https://medium.com/p/d63cbbe41a9b Tue, 27 Oct 2026 09:01:02 GMT 2026-10-27T09:01:02.648Z <![CDATA[C# & .NET for Java/Spring Developers-1]]>

If you’ve spent years shipping Spring Boot services, C# and .NET will feel familiar within about ten minutes and then throw a few genuine…

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]]> https://medium.com/@cemdrman/c-net-for-java-spring-developers-1-dd81614e643c?source=rss-668f1f3dbd5d------2 https://medium.com/p/dd81614e643c Mon, 26 Oct 2026 09:01:04 GMT 2026-10-26T09:01:04.186Z <![CDATA[Your API Gets Slower on Every Page: Keyset Pagination with Spring Data]]>

If you paginate with Pageable, you are using OFFSET pagination, and it has a property most people never notice in development: it gets…

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]]> https://medium.com/@cemdrman/your-api-gets-slower-on-every-page-keyset-pagination-with-spring-data-69ac065974cc?source=rss-668f1f3dbd5d------2 https://medium.com/p/69ac065974cc Fri, 23 Oct 2026 08:51:01 GMT 2026-10-23T08:51:01.611Z <![CDATA[Your save() Runs a SELECT Before Every INSERT — Blame Your UUID Keys]]>

Turn on SQL logging, save a brand-new entity, and watch the console. You expect one line: an INSERT. Instead you get two — a SELECT by…

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]]> https://medium.com/@cemdrman/your-save-runs-a-select-before-every-insert-blame-your-uuid-keys-aa47e5f2f4a4?source=rss-668f1f3dbd5d------2 https://medium.com/p/aa47e5f2f4a4 Thu, 22 Oct 2026 09:01:02 GMT 2026-10-22T09:01:02.804Z <![CDATA[Delete the switch: Spring Injects the Strategy Pattern for You]]>

If you have written any Spring service, you have written this switch at least once. Something arrives with a type on it — a payment method…

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]]> https://medium.com/@cemdrman/delete-the-switch-spring-injects-the-strategy-pattern-for-you-77b80c35048a?source=rss-668f1f3dbd5d------2 https://medium.com/p/77b80c35048a Wed, 21 Oct 2026 07:01:04 GMT 2026-10-21T07:01:04.122Z <![CDATA[Your Heap Just Got Smaller in Java 27: Compact Object Headers]]>

If you upgraded a service to Java 27 and noticed the heap graph settle a notch lower without touching a line of code, you are looking at…

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]]> https://medium.com/@cemdrman/your-heap-just-got-smaller-in-java-27-compact-object-headers-9b6d8b62f63f?source=rss-668f1f3dbd5d------2 https://medium.com/p/9b6d8b62f63f Tue, 20 Oct 2026 09:01:04 GMT 2026-10-20T09:01:04.099Z <![CDATA[Your @Scheduled Job Runs Three Times. ShedLock Fixes That.]]>

If you are coming from Spring Boot, @Scheduled feels like the whole job scheduler in one annotation. Add @EnableScheduling, drop…

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]]> https://medium.com/@cemdrman/your-scheduled-job-runs-three-times-shedlock-fixes-that-0c63c741e606?source=rss-668f1f3dbd5d------2 https://medium.com/p/0c63c741e606 Mon, 19 Oct 2026 07:36:01 GMT 2026-10-19T07:36:01.441Z