✨ Fixed error caused by null handling

Author: rmcdouga

spring/fluentforms-sample-webmvc-app/src/main/java/com/_4point/aem/fluentforms/sampleapp/resources/AfSubmissionHandler.java

@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 
+import org.jspecify.annotations.NonNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
@@ -15,12 +16,12 @@ public class AfSubmissionHandler implements AemProxyAfSubmission.AfSubmissionHan
 	public static final String AF_TEMPLATE_NAME = "sample00002test";
 
 	@Override
-	public boolean canHandle(String formName) {
+	public boolean canHandle(@NonNull String formName) {
 		return Objects.equals(AF_TEMPLATE_NAME, formName);
 	}
 
 	@Override
-	public SubmitResponse processSubmission(Submission submission) {
+	public @NonNull SubmitResponse processSubmission(@NonNull Submission submission) {
 		// TODO: Implement a less trivial submission handler, maybe one that generates and returns a PDF.
 		logger.atInfo().log("Received submission");
 		return Response.text("Successful Submit");