1. Create new workspace 2. Configure Eclipse to compile/run on Java 17:  - Window -> Preferences -> Java -> Compiler -> JDK Compliance -> 17 (can use project specific of global settings for this)  - Window -> Preferences -> Java -> Installed JRE -> Execution Environment -> JavaSE-17 3. Configure WildFly 24+ runtime:  - Window -> Preferences -> Server -> Runtime Environment -> Add (make sure you add WildFly 24+ runtime with JavaSE-17 as execution environment) 4. Optional: Add new Server (via "Server" tab in Eclipse) based on that newly created runtime. 5. Import/create JSF project(s). Optional: If creating new select JSF version 2.3. And use the runtime created in step 3. Assumption is that Maven is already configured. 6. Make sure the project will use Java 17:  - Right click on the project -> Properties -> Java Compiler -> JDK compliance -> 17 (or uncheck "Use project specific settings" and use the Java 17 based global settings). 7. Check "Project Facets" -> Java (it will be set to a Java version that is lower than 17, max that can be selected is 16). 8. Navigate to <project_workspace_location>/<project_name>/.settings and edit file "org.eclipse.wst.common.project.facet.core.xml". Replace "<installed facet="java" version="16"/>" with "<installed facet="java" version="17"/>". 9. Restart Eclipse and open the same workspace/project. Error is displayed. (Note changing anything in the UI [Project properties] for the Facets version will wipe the runtime from that options for that facet if Java 17 is used for a version)