fix the doc to list jdk 21 as the new dependency

Author: shroffk

README.md

@@ -8,7 +8,7 @@ https://control-system-studio.readthedocs.io
 
 
 ## Requirements
- - [JDK17 or later, suggested is OpenJDK](https://adoptium.net/en-GB/temurin/archive/?version=17).
+ - [JDK21 or later, suggested is OpenJDK](https://adoptium.net/en-GB/temurin/releases?version=21).
  - [maven 3.x](https://maven.apache.org/) or [ant](http://ant.apache.org/)
 
 
@@ -27,7 +27,7 @@ mvn clean verify -f dependencies/pom.xml
 Define the JAVA_HOME environment variable to point to your Java installation directory. 
 Mac OS users should use something like:
 ```
-export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-17.0.10+7/Contents/Home
+export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-21.0.11+10/Contents/Home
 ```
 Verify through:
 ```
@@ -73,14 +73,14 @@ Download "Eclipse for Java Developers" from https://www.eclipse.org/downloads/pa
 
 Start Eclipse like this:
 
-    export JAVA_HOME=/path/to/your/jdk-17-or-later
+    export JAVA_HOME=/path/to/your/jdk-21-or-later
     export PATH="$JAVA_HOME/bin:$PATH"
     eclipse/eclipse -consoleLog
 
 Check Eclipse Preferences:
 
- * Java, Installed JREs: JDK 17-or-later should be the default
- * Java, Compiler: JDK Compliance should be "9" or higher
+ * Java, Installed JREs: JDK 21-or-later should be the default
+ * Java, Compiler: JDK Compliance should be "21" or higher
 
 
 ### Use plain Java configuration
@@ -112,7 +112,7 @@ In Help/Eclipse Marketplace, search for Maven Integration for Eclipse Luna or ne
 Use File/Import/Maven/Existing Maven Projects to import the phoebus source code.
 
 There can be a compiler error because the "JRE System Library" in the Package Explorer shows "[J2SE-1.4]".
-Right click on the affected projects (greeting-app, probe), Build Path, Configure Build Path, Libraries, Edit the JRE System Library to use the Workspace default (jdk-17).
+Right click on the affected projects (greeting-app, probe), Build Path, Configure Build Path, Libraries, Edit the JRE System Library to use the Workspace default (jdk-21).
 Restart Eclipse IDE.
 
 Can now start product/src/main/java/org.phoebus.product/Launcher.java.
@@ -126,14 +126,14 @@ To import the project:
 * Select the Phoebus directory
 * Import project from external model: Maven
 * Accept the default options and click Next twice
-* Ensure that the JDK is version 11 or above
+ * Ensure that the JDK is version 21 or above
 * Change the project name to Phoebus and click finish
 
 To run the Phoebus application:
 
 * Run | Edit Configurations...
 * Select + | Application
-* Module: Your JRE 17
+ * Module: Your JRE 21
 * Classpath `-cp`: select `product` from drop-down
 * Main class: `org.phoebus.product.Launcher`
 * Set the name to Phoebus

app/queue-server/README.md

@@ -30,7 +30,7 @@ A JavaFX-based client for the [Bluesky QueueServer](https://blueskyproject.io/bl
 
 ### Prerequisites
 
-- **Java 17** or later
+- **Java 21** or later
 - **Maven** (for building from source)
 - **Bluesky Queue Server** running and accessible
 
@@ -107,4 +107,4 @@ When making changes:
 2. Test with both WebSocket and HTTP fallback modes
 3. Verify API key authentication works
 4. Update documentation for new features
-5. Follow existing code style and patterns
+5. Follow existing code style and patterns

services/save-and-restore/README.md

@@ -4,7 +4,7 @@ The save-and-restore service implements service as a collection
 of REST endpoints. These can be used by clients to manage configurations (aka save sets) and
 snapshots, to compare snapshots and to restore PV values from snapshots.
 
-The service is packaged as a self-contained Spring Boot jar file. External dependencies are limited to a JVM (Java 17+)
+The service is packaged as a self-contained Spring Boot jar file. External dependencies are limited to a JVM (Java 21+)
 and a running instance of Elasticsearch (8.x).
 
 # Build
@@ -82,4 +82,4 @@ This may be preferable compared to setting environment variables on command line
 ```>export HOST_IP_ADDRESS=1.2.3.4```.
 
 **NOTE:** Accessing IOCs over pva (default mode in the Docker compose files) works **only** if IOC is running on the
-same host as the Docker container. Moreover, this has been verified to work only on Linux.
+same host as the Docker container. Moreover, this has been verified to work only on Linux.

services/save-and-restore/doc/index.rst

@@ -5,7 +5,7 @@ The save-and-restore service implements service as a collection
 of REST endpoints. These can be used by clients to manage configurations (aka save sets) and
 snapshots, to compare snapshots and to restore PV values from snapshots.
 
-The service is packaged as a self-contained Spring Boot jar file. External dependencies are limited to a JVM (Java 17+)
+The service is packaged as a self-contained Spring Boot jar file. External dependencies are limited to a JVM (Java 21+)
 and a running instance of Elasticsearch (8.x).
 
 Running the service