Update Coffee Kata to JDK 21.

Signed-off-by: Donald Raab <[email protected]>

README.md

@@ -33,7 +33,7 @@ Guava, Apache Commons and/or Vavr on a simple domain
 
 
 ## What you will need to build the katas
-1. Java 17
+1. Java 21
 2. Maven 3.6.1+
 3. IDE of your choice
 

coffee-shop-kata-solutions/pom.xml

@@ -32,8 +32,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>20</maven.compiler.source>
-        <maven.compiler.target>20</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <junit5.version>5.10.0</junit5.version>
     </properties>
 
@@ -70,4 +70,4 @@
         </plugins>
     </build>
 
-</project>
+</project>

coffee-shop-kata/SETUP.md

@@ -1,22 +1,22 @@
 ## Setting up the project
 
 ### Requirements
-* [JDK 20](https://jdk.java.net/20/) installed on your computer 
+* [JDK 21](https://jdk.java.net/21/) installed on your computer 
 
   Note: The latest version of IntelliJ only supports Java 20
 * [Maven 3.6.1+](https://maven.apache.org/download.cgi) installed on your computer
-* [IntelliJ IDEA 2023.1+](https://www.jetbrains.com/idea/download/?section=windows) or similar IDE for Java
+* [IntelliJ IDEA 2023.2.5+](https://www.jetbrains.com/idea/download/?section=windows) or similar IDE for Java
 
 ### Project setup
 1. Git clone the entire [code-katas](https://github.com/BNYMellon/CodeKatas) project from GitHub or download the project
    as a .zip file.
 2. Launch the project in the IDE and point to the pom.xml to be opened as a project.
    You can find more instructions on how to do
    that [here](https://www.jetbrains.com/idea/guide/tutorials/working-with-maven/importing-a-project/).
-3. To use Java 20 preview features in IntelliJ IDEA, follow these steps:
+3. To use Java 21 features in IntelliJ IDEA, follow these steps:
    - Go to File | Project Structure.
-   - Set the Project SDK to 20.
-   - Set the Project language level to "20 (Preview)...".
+   - Set the Project SDK to 21.
+   - Set the Project language level to "21 - Record patterns, pattern matching for switch...".
    - Make sure you have the correct JDK selected.
 4. To verify that the Java 8 module is set up correctly,
    run [CoffeeShopTest](jdk8/src/test/java/bnymellon/codekatas/coffeeshopkata/CoffeeShopTest.java) in the
@@ -26,4 +26,4 @@
    jdk21 module - the class should compile but all tests will fail.
 
 ### Getting started
-* Follow the [README](README.md) for instructions on how to complete the kata.
+* Follow the [README](README.md) for instructions on how to complete the kata.

coffee-shop-kata/jdk21/pom.xml

@@ -30,8 +30,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>20</maven.compiler.source>
-        <maven.compiler.target>20</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <junit5.version>5.10.0</junit5.version>
     </properties>