JDK 24: update JEPs

Author: wesleyegberto

README.md

@@ -13,6 +13,7 @@ A project to explore more about the new features from Java 8 through Java 21.
 
 * [Java 24](java-24/)
   * Generational Shenandoah (experimental)
+  * Compact Object Headers (experimental)
   * Prepare to Restrict the Use of JNI
   * Late Barrier Expansion for G1
   * Key Derivation Function API (preview)
@@ -27,39 +28,47 @@ A project to explore more about the new features from Java 8 through Java 21.
 * [Java 23](java-23/) (Sep, 2024)
   * Primitive Types in Patterns, `instanceof` and `switch` (preview)
   * Class-File API (preview 2)
-  * Stream Gatherers (preview 2)
   * Markdown Documentation Comments
+  * Vector API (incubator)
+  * Stream Gatherers (preview 2)
+  * Deprecate the Memory-Access Methods in Unsafe for Removal
+  * ZGC Generational Mode by Default
   * Module Import Declarations (preview)
   * Implicity Declared Classes and Instance Main Methods (preview 3)
   * Structured Concurrency (preview 3)
   * Scoped Value (preview 3)
   * Flexible Constructor Bodies (preview 2)
 
 * [Java 22](java-22/) (Mar, 2024)
+  * Region Pinning for G1
   * Statements before `super` (preview)
   * FFM API (standard)
   * Unnamed Variable & Patterns
+  * Class-File API (preview)
   * Launch Multi-File Source-Code Programs
   * String Templates (preview 2)
+  * Vector API (incubator)
   * Stream Gatherers (preview)
   * Structured Concurrency (preview 2)
   * Scoped Value (preview 2)
-  * Class-File API (preview)
   * Implicity Declared Classes and Instance Main Methods (preview 2)
 
 * [Java 21](java-21/) (LTS; Sep, 2023)
-  * Virtual Threads (standard) :rocket:
+  * String Templates (preview)
+  * Sequenced Collections
+  * Generational ZGC
   * Record Pattern (standard) :rocket:
   * Pattern Matching for `switch` (standard) :rocket:
-  * Sequenced Collections
-  * String Templates (preview)
   * Foreign Function & memory API (preview 3)
   * Unnamed Patterns and Variables (preview)
+  * Virtual Threads (standard) :rocket:
   * Unnamed Classes and Instance Main Methods (preview)
+  * Scoped Value (preview)
+  * Vector API (incubator)
+  * Deprecate the Windows 32-bit x86 Port for Removal
   * Prepare to Disallow the Dynamic Loading of Agents
   * KEM API
   * Structured Concurrency (preview)
-  * Scoped Value (preview)
 
 * [Java 20](java-20/) (Mar, 2023)
   * Scoped values (incubator)
@@ -68,6 +77,7 @@ A project to explore more about the new features from Java 8 through Java 21.
   * Foreign Function & memory API (preview 2)
   * Virtual Threads (preview 2)
   * Structured concurrency (second incubator)
+  * Vector API (incubator)
 
 * [Java 19](java-19/) (Sep, 2022)
   * Virtual Thread (preview) :rocket:
@@ -84,12 +94,20 @@ A project to explore more about the new features from Java 8 through Java 21.
   * Deprecated method `finalize`
 
 * [Java 17](java-17/) (LTS; Sep, 2021)
-  * Sealed classes (standard)
-  * Pattern matching for `switch` (preview)
+  * Restore Always-Strict Floating-Point Semantics
   * Enhanced Pseudo-Random Number Generator
-  * Deprecate the Applet API for Removal
   * New macOS rendering for Java 2D API
+  * macOS/AArch64 Port
+  * Deprecate the Applet API for Removal
+  * Strongly Encapsulate JDK Internals
+  * Pattern matching for `switch` (preview)
+  * Remove RMI Activation
+  * Sealed Classes (standard)
   * Remove the experimental AOT and JIT compiler
+  * Deprecate the Security Manager for Removal
+  * Foreign Function & Memory API (incubator)
+  * Vector API (fourth incubator)
+  * Context-Specific Deserialization Filters
 
 * [Java 16](java-16/) (Mar, 2021)
   * Records (standard)

java-17/README.md

@@ -22,6 +22,7 @@ To run each example use: `java --enable-preview --source 17 <FileName.java>`
 ## Features
 
 * **Sealed Classes (standard)**
+  * promotion to standard without change
 * **Pattern Matching for `switch` (preview)**
   * improved switch to support pattern matching for types (like `instanceof`)
   * support for `null` case

java-24/README.md

@@ -5,6 +5,7 @@ To run each example use: `java --enable-preview --source 24 <FileName.java>`
 ## JEPs
 
 * [404](https://openjdk.org/jeps/404) - Generational Shenandoah (Experimental)
+* [450](https://openjdk.org/jeps/450) - Compact Object Headers (Experimental)
 * [472](https://openjdk.org/jeps/472) - Prepare to Restrict the Use of JNI
 * [475](https://openjdk.org/jeps/475) - Late Barrier Expansion for G1
 * [478](https://openjdk.org/jeps/478) - Key Derivation Function API (Preview)
@@ -70,6 +71,8 @@ To run each example use: `java --enable-preview --source 24 <FileName.java>`
             System.out.println("Method " + mm.methodName().stringValue());
         }
         ```
+* **Steam Gatherers**
+    * promotion to standard without change
 * **Scoped Values**
     * re-preview with API changes
     * removed methods `callWhere` and `runWhere` to make API more fluent
@@ -78,6 +81,12 @@ To run each example use: `java --enable-preview --source 24 <FileName.java>`
         * `ScopedValue.where(SCOPE_A, "my-value").where(SCOPE_B, "other-value").run(() -> {})`
 * **Primitive Types in Patterns, instanceof, and switch**
     * re-preview without change
+* **ZGC - Remove the Non-Generational Mode**
+    * remove non-generational mode of the ZGC to reduce maintenance cost
+    * changes in command-line options:
+        * `-XX:+UseZGC`: will use generational ZGC
+        * `-XX:+UseZGC -XX:+ZGenerational`: will use generational ZGC and print a warning about obsolete option
+        * `-XX:+UseZGC -XX:-ZGenerational`: will use generational ZGC and print a warning about obsolete option
 
 ## Links