support CDS

Author: mmoayyed

app/src/main/resources/common/README.md.mustache

@@ -125,6 +125,21 @@ Run the CAS web application as a *standalone* executable WAR:
 ./gradlew[.bat] clean executable
 ```
 
+### CDS Support
+
+CDS is a JVM feature that can help reduce the startup time and memory footprint of Java applications. CAS via Spring Boot
+now has support for easy creation of a CDS friendly layout. This layout can be created by extracting the CAS web application file
+with the help of the `tools` jarmode:
+
+```bash
+# Note:
+# You must first build the web application with "executable" turned off
+java -Djarmode=tools -jar build/libs/{{appName}}.war extract
+
+# Run the CAS web application via CDS
+java -jar {{appName}}/{{appName}}.war
+```
+
 ## External
 
 Deploy the binary web application file in `build/libs` after a successful build to a servlet container of choice.

ci/validate-cas-overlay.sh

@@ -212,6 +212,26 @@ if [[ "$CAS_MAJOR_VERSION" -ge 7 ]]; then
   ./gradlew --init-script openrewrite.gradle rewriteDryRun \
     -PtargetVersion="${targetVersion}" -DactiveRecipe="$recipeName"
   [ $? -eq 0 ] && echo "Gradle command ran successfully." || exit 1
+
+  if [[ "$CAS_MINOR_VERSION" -ge 1 ]]; then
+    printgreen "Build CAS web application without executable mode..."
+    ./gradlew clean build -Pexecutable=false --no-daemon
+    
+    printgreen "Extracting Uber WAR from CAS to prepare CDS launch..."
+    java -Djarmode=tools -jar build/libs/cas.war extract
+    java -jar ./cas/cas.war --spring.profiles.active=none --server.ssl.enabled=false --server.port=8091 &
+    pid=$!
+    sleep 15
+    echo "Launched executable CAS with pid ${pid}. Waiting for CAS server to come online..."
+    until curl -k -L --output /dev/null --silent --fail http://localhost:8091/cas/login; do
+       echo -n '.'
+       sleep 5
+    done
+    echo -e "\n\nReady!"
+    echo "Killing process $pid"
+    kill -9 $pid
+    [ "$CI" = "true" ] && pkill java
+  fi
 fi
 
 [ "$CI" = "true" ] && pkill java