{"id":9472,"date":"2025-03-11T13:37:02","date_gmt":"2025-03-11T13:37:02","guid":{"rendered":"https:\/\/www.aegissofttech.com\/insights\/?p=9472"},"modified":"2025-10-02T06:44:35","modified_gmt":"2025-10-02T06:44:35","slug":"integrate-java-23-into-spring-boot-3-x-microservices","status":"publish","type":"post","link":"https:\/\/www.aegissofttech.com\/insights\/integrate-java-23-into-spring-boot-3-x-microservices\/","title":{"rendered":"How to Integrate Java 23 Features into Spring Boot 3.x Microservices"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Java 23 &amp; Springboot compatibility:<\/strong><\/h2>\n\n\n\n<p>As of sept 2025, Java 23 has been released officially. On the other hand Spring Boot 3.x is designed such a way that it is compatible with Java versions 17 through 23. This compatibility actually ensures that we can leverage the latest features of Java 23 within their Spring Boot 3.x applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Compatibility Considerations:<\/h3>\n\n\n\n<p><strong>Jakarta EE Migration:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In Spring Boot 3.x actually it has fully transitioned from Java EE (`javax` packages) to Jakarta EE (`jakarta` packages). This migration basically requires developers to update their imports and dependencies accordingly. For example, ` <strong>javax.persistence.Entity<\/strong>` should be replaced with ` <strong>jakarta.persistence.Entity<\/strong>`. This change aligns with the broader ecosystem&#8217;s shift towards Jakarta EE.<\/li>\n<\/ul>\n\n\n\n<p><strong>Java 23 Features:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Java 23 introduces several enhancements and this includes improved pattern matching and the Vector API and generational ZGC. In our Spring Boot 3.x applications, we can utilize these features seamlessly and only criteria is that our application is running on a Java 23 runtime.<\/li>\n<\/ul>\n\n\n\n<p>Complex Example: Utilizing Java 23 Features in a Spring Boot 3.x Application<\/p>\n\n\n\n<p>Below is an example demonstrating the integration of Java 23&#8217;s pattern matching enhancements within a Spring Boot 3.x REST controller:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"585\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features-1024x585.png\" alt=\"Utilizing Java 23 Features\" class=\"wp-image-9517\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features-1024x585.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features-300x171.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features-768x439.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features.png 1506w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"970\" height=\"486\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features2.png\" alt=\"\" class=\"wp-image-9518\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features2.png 970w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features2-300x150.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Utilizing-Java-23-Features2-768x385.png 768w\" sizes=\"(max-width: 970px) 100vw, 970px\" \/><\/figure>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pattern Matching in `switch`: The `patternMatchExample` method basically portrays Java 23&#8217;s enhanced pattern matching capabilities within a `switch` statement, and this allows for type-specific handling directly in the case labels.<\/li>\n\n\n\n<li>Jakarta Persistence API: The `SampleEntity` class utilizes `jakarta.persistence` annotations and this basically reflects the necessary migration from `javax.persistence` in Spring Boot 3.x.<\/li>\n<\/ul>\n\n\n\n<p><strong>Migration Tips:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Update Dependencies: Ensure all dependencies are compatible with Jakarta EE. This may involve updating library versions or replacing libraries that have not yet migrated to Jakarta EE.<\/li>\n\n\n\n<li>Refactor Imports: Use tools or IDE features to refactor `javax` imports to `jakarta` equivalents systematically.<\/li>\n\n\n\n<li>Testing: Thoroughly test the application after migration to identify and resolve any issues arising from the transition.<\/li>\n<\/ul>\n\n\n\n<p>By adhering to these guidelines, developers can effectively leverage the advancements of Java 23 within their Spring Boot 3.x applications that will definitely ensure modern, efficient, and maintainable codebases.<\/p>\n\n\n\n<p>Integrating Java 23 features into Spring Boot 3.x microservices can significantly enhance development efficiency, performance, and code readability. Below I have explained some key <a href=\"https:\/\/www.aegissofttech.com\/insights\/new-features-java-23\/\" target=\"_blank\" rel=\"noreferrer noopener\">Java 23 features<\/a> and their implications for Spring Boot microservices in addition with complex use case implementations:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Primitive Types in Pattern Matching and `switch` Statements<\/h3>\n\n\n\n<p>Java 23 extends pattern matching to support primitive types in `instanceof` checks and `switch` statements which enables and make it more concise and type-safe code.<\/p>\n\n\n\n<p><strong>Use Case<\/strong>: Dynamic Request Processing Based on Input Type<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In a microservice handling various types of inputs (e.g., JSON, XML, plain text), you can utilize enhanced `switch` statements to process requests dynamically:<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"740\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Dynamic-Request-Processing-Based-on-Input-Type-1024x740.png\" alt=\"Dynamic Request Processing Based on Input Type\" class=\"wp-image-9473\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Dynamic-Request-Processing-Based-on-Input-Type-1024x740.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Dynamic-Request-Processing-Based-on-Input-Type-300x217.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Dynamic-Request-Processing-Based-on-Input-Type-768x555.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Dynamic-Request-Processing-Based-on-Input-Type.png 1476w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>This approach streamlines input handling by leveraging Java 23&#8217;s pattern matching capabilities and it basically reduces boilerplate code and enhances maintainability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structured Concurrency<\/h3>\n\n\n\n<p>Java 23 introduces structured concurrency that basically simplifies managing multiple concurrent tasks by treating them as a single unit of work.<\/p>\n\n\n\n<p><strong>Use Case<\/strong>: Parallel Data Fetching from Multiple Services<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In a scenario &nbsp;what happens actually where a microservice needs to aggregate data from multiple external services and here it may be through various 3<sup>rd<\/sup> party API calls and in this scenario, &nbsp;structured concurrency can be employed to perform parallel data fetching:<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"690\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Parallel-Data-Fetching-from-Multiple-Services-1024x690.png\" alt=\"\" class=\"wp-image-9474\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Parallel-Data-Fetching-from-Multiple-Services-1024x690.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Parallel-Data-Fetching-from-Multiple-Services-300x202.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Parallel-Data-Fetching-from-Multiple-Services-768x517.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Parallel-Data-Fetching-from-Multiple-Services-1536x1034.png 1536w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Parallel-Data-Fetching-from-Multiple-Services.png 1678w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The above implementation ensures that data fetching operations from various svcs are executed concurrently, and this basically improves response times and at the same time it maintains error handling and cancellation policies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Scoped Values<\/h3>\n\n\n\n<p>Scoped values provide a safer and more efficient alternative to thread-local variables, especially useful in microservices handling asynchronous requests.<\/p>\n\n\n\n<p><strong>Use Case<\/strong>: Propagating Context Information in Asynchronous Operations<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When processing requests that require context propagation (e.g., user authentication details) across asynchronous operations, scoped values can be utilized:<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"545\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Propagating-Context-Information-in-Asynchronous-Operations-1024x545.png\" alt=\"Propagating Context Information in Asynchronous Operations\" class=\"wp-image-9475\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Propagating-Context-Information-in-Asynchronous-Operations-1024x545.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Propagating-Context-Information-in-Asynchronous-Operations-300x160.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Propagating-Context-Information-in-Asynchronous-Operations-768x409.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Propagating-Context-Information-in-Asynchronous-Operations-1536x818.png 1536w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Propagating-Context-Information-in-Asynchronous-Operations.png 1612w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>This pattern ensures that context information is safely and efficiently propagated across asynchronous boundaries without the pitfalls of traditional thread-local storage.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Markdown Documentation Comments<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Java 23 allows the use of Markdown syntax in JavaDoc comments and as a result it basically enhances the readability and maintainability of API documentation.<\/li>\n<\/ul>\n\n\n\n<p>Use Case: Enhancing API Documentation for Microservices<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In a Spring Boot microservice, we can document REST controllers using Markdown because it provides user-friendly and formatted API documentation:<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"885\" height=\"1024\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Enhancing-API-Documentation-for-Microservices-885x1024.png\" alt=\"\" class=\"wp-image-9476\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Enhancing-API-Documentation-for-Microservices-885x1024.png 885w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Enhancing-API-Documentation-for-Microservices-259x300.png 259w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Enhancing-API-Documentation-for-Microservices-768x888.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Enhancing-API-Documentation-for-Microservices.png 1214w\" sizes=\"(max-width: 885px) 100vw, 885px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If we utilizing Markdown in documentation comments, then basically it will improve the clarity and accessibility of API documentation as you can see in above example and this facilitates better collaboration and understanding among development teams.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><u>How to migrate a Spring Boot Microservice from Java 17\/21 to Java 23<\/u><\/strong><\/h2>\n\n\n\n<p>If you want to migrate your Spring Boot microservice from Java 17\/21 to Java 23, the major steps would involve updating dependencies, leveraging new language features, and ensuring compatibility with Spring Boot 3.x. Many <strong><a href=\"https:\/\/www.aegissofttech.com\/java-application-development-services.html\" target=\"_blank\" rel=\"noreferrer noopener\">Java development services<\/a><\/strong> providers follow this approach to ensure smooth and efficient migration. Below, I have explained in detail about the migration with detailed examples.<\/p>\n\n\n\n<p><strong>&nbsp;1. Upgrade Java Version and Dependencies<\/strong><\/p>\n\n\n\n<p>First, update your project&#8217;s JDK version to Java 23.<\/p>\n\n\n\n<p><strong>For Maven:<\/strong><\/p>\n\n\n\n<p>Modify your `pom.xml`:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"648\" height=\"148\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/For-Maven.png\" alt=\"For Maven\" class=\"wp-image-9477\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/For-Maven.png 648w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/For-Maven-300x69.png 300w\" sizes=\"(max-width: 648px) 100vw, 648px\" \/><\/figure>\n\n\n\n<p><strong>For Gradle:<\/strong><\/p>\n\n\n\n<p>Modify `build.gradle`: gradle<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"882\" height=\"218\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Gradle.png\" alt=\"Gradle\" class=\"wp-image-9478\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Gradle.png 882w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Gradle-300x74.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Gradle-768x190.png 768w\" sizes=\"(max-width: 882px) 100vw, 882px\" \/><\/figure>\n\n\n\n<p><strong>Check Java version:<\/strong><\/p>\n\n\n\n<p>java -version<\/p>\n\n\n\n<p><strong>Expected output:<\/strong><\/p>\n\n\n\n<p>openjdk version &#8220;23&#8221; 2025-XX-XX<\/p>\n\n\n\n<p><strong>2. Update Dependencies<\/strong><\/p>\n\n\n\n<p>Spring Boot 3.x<\/p>\n\n\n\n<p>Suppose your microservice is currently on Spring Boot 2.x, then you have to update it to latest version of springboot and it is Spring Boot 3.x, because 3.x supports Java 23.<\/p>\n\n\n\n<p><strong>Update `pom.xml`:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1004\" height=\"250\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Spring-Boot-3.x.png\" alt=\" Spring Boot 3.x\" class=\"wp-image-9479\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Spring-Boot-3.x.png 1004w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Spring-Boot-3.x-300x75.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Spring-Boot-3.x-768x191.png 768w\" sizes=\"(max-width: 1004px) 100vw, 1004px\" \/><\/figure>\n\n\n\n<p><strong>3. Code Changes for Java 23 Compatibility<\/strong><\/p>\n\n\n\n<p>(A) Refactor `javax` to `jakarta`<\/p>\n\n\n\n<p>Spring Boot 3.x replaces `javax` with `jakarta`. Update imports in your code:<\/p>\n\n\n\n<p>Before (Java 17\/21 &#8211; Spring Boot 2.x)<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"690\" height=\"154\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Code-Changes-for-Java-23-Compatibility.png\" alt=\"Code Changes for Java 23 Compatibility\" class=\"wp-image-9480\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Code-Changes-for-Java-23-Compatibility.png 690w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Code-Changes-for-Java-23-Compatibility-300x67.png 300w\" sizes=\"(max-width: 690px) 100vw, 690px\" \/><\/figure>\n\n\n\n<p>&nbsp;After (Java 23 &#8211; Spring Boot 3.x)<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"744\" height=\"112\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/After-Java-23-Spring-Boot-3.x.png\" alt=\" After (Java 23 - Spring Boot 3.x)\" class=\"wp-image-9481\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/After-Java-23-Spring-Boot-3.x.png 744w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/After-Java-23-Spring-Boot-3.x-300x45.png 300w\" sizes=\"(max-width: 744px) 100vw, 744px\" \/><\/figure>\n\n\n\n<p>If you use `@WebServlet`, `@WebFilter`, or `@WebListener`, update them:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"714\" height=\"114\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/WebServlet.png\" alt=\"WebServlet\" class=\"wp-image-9482\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/WebServlet.png 714w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/WebServlet-300x48.png 300w\" sizes=\"(max-width: 714px) 100vw, 714px\" \/><\/figure>\n\n\n\n<p>(B) Replace `ThreadLocal` with Scoped Values<\/p>\n\n\n\n<p>&nbsp;Before (Using ThreadLocal in Java 17\/21)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"436\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/ThreadLocal-1024x436.png\" alt=\"\" class=\"wp-image-9483\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/ThreadLocal-1024x436.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/ThreadLocal-300x128.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/ThreadLocal-768x327.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/ThreadLocal.png 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Issue<\/strong>: ThreadLocal is inefficient in reactive Spring applications.<\/p>\n\n\n\n<p>After (Using Scoped Values in Java 23)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"399\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-Scoped-Values-in-Java-23-1024x399.png\" alt=\"Using Scoped Values in Java 23\" class=\"wp-image-9484\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-Scoped-Values-in-Java-23-1024x399.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-Scoped-Values-in-Java-23-300x117.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-Scoped-Values-in-Java-23-768x299.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-Scoped-Values-in-Java-23.png 1406w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Benefits<\/strong>: Scoped Values are more memory-efficient and safe in asynchronous applications.<\/p>\n\n\n\n<p><strong>(C) Optimize Concurrency with Structured Concurrency<\/strong><\/p>\n\n\n\n<p>Java 23 introduces structured concurrency, simplifying parallel execution.<\/p>\n\n\n\n<p>Before (Using `CompletableFuture` in Java 17\/21)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"129\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/CompletableFuture-1024x129.png\" alt=\"CompletableFuture\" class=\"wp-image-9486\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/CompletableFuture-1024x129.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/CompletableFuture-300x38.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/CompletableFuture-768x97.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/CompletableFuture-1536x194.png 1536w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/CompletableFuture.png 1872w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Issue<\/strong>: Harder to manage errors and cancellation.<\/p>\n\n\n\n<p>After (Using StructuredTaskScope in Java 23)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"475\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-StructuredTaskScope-in-Java-23-1024x475.png\" alt=\"Using StructuredTaskScope in Java 23\" class=\"wp-image-9487\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-StructuredTaskScope-in-Java-23-1024x475.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-StructuredTaskScope-in-Java-23-300x139.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-StructuredTaskScope-in-Java-23-768x356.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-StructuredTaskScope-in-Java-23-1536x712.png 1536w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Using-StructuredTaskScope-in-Java-23.png 1548w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Benefits: Improves cancellation, error handling, and performance.<\/p>\n\n\n\n<p><strong>(D) Use Record Patterns for Cleaner Code<\/strong><\/p>\n\n\n\n<p>Java 23 extends pattern matching in records.<\/p>\n\n\n\n<p>Before (Java 17\/21)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>record User(String name, int age) {}<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"189\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Use-Record-Patterns-1024x189.png\" alt=\"Use Record Patterns\" class=\"wp-image-9488\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Use-Record-Patterns-1024x189.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Use-Record-Patterns-300x55.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Use-Record-Patterns-768x142.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Use-Record-Patterns.png 1118w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>After (Java 23 &#8211; Record Patterns in `switch`)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>record User(String name, int age) {}<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"185\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Java-23-Record-Patterns-1024x185.png\" alt=\"Java 23 - Record Patterns\" class=\"wp-image-9489\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Java-23-Record-Patterns-1024x185.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Java-23-Record-Patterns-300x54.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Java-23-Record-Patterns-768x138.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Java-23-Record-Patterns-1536x277.png 1536w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Java-23-Record-Patterns.png 1576w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Benefits: Improves readability by removing unnecessary type checks.<\/p>\n\n\n\n<p><strong>(E) Use Virtual Threads for Efficient Microservices<\/strong><\/p>\n\n\n\n<p>Java 23 refines virtual threads, reducing the need for thread pools.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"916\" height=\"124\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Thread-Pool.png\" alt=\"Thread Pool\" class=\"wp-image-9490\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Thread-Pool.png 916w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Thread-Pool-300x41.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Thread-Pool-768x104.png 768w\" sizes=\"(max-width: 916px) 100vw, 916px\" \/><\/figure>\n\n\n\n<p>After (Java 23 &#8211; Virtual Threads)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"82\" src=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Virtual-Threads-1024x82.png\" alt=\"Virtual Threads\" class=\"wp-image-9491\" title=\"\" srcset=\"https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Virtual-Threads-1024x82.png 1024w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Virtual-Threads-300x24.png 300w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Virtual-Threads-768x61.png 768w, https:\/\/www.aegissofttech.com\/insights\/wp-content\/uploads\/2025\/03\/Virtual-Threads.png 1050w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Benefits: More lightweight and scalable for microservices.<\/p>\n\n\n\n<p><strong>&nbsp;4. Testing Java 23 Migration<\/strong><\/p>\n\n\n\n<p>Run the following tests to validate your migration:<\/p>\n\n\n\n<p>Check Java Version<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>java -version<\/li>\n<\/ul>\n\n\n\n<p>Run Unit Tests<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mvn test<\/li>\n<\/ul>\n\n\n\n<p>Check Jakarta EE Migration<\/p>\n\n\n\n<p>Use Maven Dependency Plugin:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mvn dependency:tree<\/li>\n<\/ul>\n\n\n\n<p>You will have to make sure that all your dependencies that you are using should be Jakarta EE compatible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion:<\/strong><\/h2>\n\n\n\n<p>Your goal to migrating from Java 17\/21 to Java 23 in a Spring Boot microservice is worth because it would improve performance, code readability, and concurrency handling. The key changes include:<\/p>\n\n\n\n<p>\u2714 Updating `javax` to `jakarta`&nbsp;<\/p>\n\n\n\n<p>\u2714 Using Scoped Values instead of ThreadLocal&nbsp;<\/p>\n\n\n\n<p>\u2714 Switching from CompletableFuture to StructuredTaskScope&nbsp;<\/p>\n\n\n\n<p>\u2714 Utilizing Pattern Matching and Record Patterns&nbsp;<\/p>\n\n\n\n<p>\u2714 Replacing Thread Pools with Virtual Threads&nbsp;<\/p>\n\n\n\n<p>By following the above mentioned step, your microservices will be optimized for Java 23 as well as it will leverage the latest Spring Boot 3.x capabilities.<\/p>\n\n\n\n<p><strong>Read More:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.aegissofttech.com\/insights\/kafka-baggage-amp-webflux-migration-to-spring-boot\/\" target=\"_blank\" rel=\"noreferrer noopener\">Kafka, Baggage &amp; Webflux Migration to Spring Boot 3.X for Microservices<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.aegissofttech.com\/insights\/integrating-keycloak-identity-management-in-spring-boot-microservices\/\" target=\"_blank\" rel=\"noreferrer noopener\">Integrating Keycloak for Smooth Identity Management in Spring Boot Microservices<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":" ","protected":false},"author":12,"featured_media":9558,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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