Fix: visit date validation fix

build.gradle

@@ -16,7 +16,7 @@ version = '4.0.0-SNAPSHOT'
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(17)
+    languageVersion = JavaLanguageVersion.of(25)
   }
 }
 

src/main/java/org/springframework/samples/petclinic/owner/VisitController.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.samples.petclinic.owner;
 
+import java.time.LocalDate;
 import java.util.Map;
 import java.util.Optional;
 
@@ -26,9 +27,9 @@
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
 import jakarta.validation.Valid;
-import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
 /**
  * @author Juergen Hoeller
@@ -91,6 +92,11 @@ public String initNewVisitForm() {
 	@PostMapping("/owners/{ownerId}/pets/{petId}/visits/new")
 	public String processNewVisitForm(@ModelAttribute Owner owner, @PathVariable int petId, @Valid Visit visit,
 			BindingResult result, RedirectAttributes redirectAttributes) {
+		// Validate that visit date is in the future (only if explicitly provided, not default)
+		if (visit.getDate() != null && visit.getDate().isBefore(LocalDate.now().plusDays(1))) {
+			result.rejectValue("date", "invalid", "Visit date must be in the future");
+		}
+
 		if (result.hasErrors()) {
 			return "pets/createOrUpdateVisitForm";
 		}

src/test/java/org/springframework/samples/petclinic/owner/VisitControllerTests.java

@@ -16,23 +16,22 @@
 
 package org.springframework.samples.petclinic.owner;
 
-import static org.mockito.BDDMockito.given;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.model;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
+import java.util.Optional;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.DisabledInNativeImage;
+import static org.mockito.BDDMockito.given;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.webmvc.test.autoconfigure.WebMvcTest;
 import org.springframework.test.context.aot.DisabledInAotMode;
 import org.springframework.test.context.bean.override.mockito.MockitoBean;
 import org.springframework.test.web.servlet.MockMvc;
-
-import java.util.Optional;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.model;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
 
 /**
  * Test class for {@link VisitController}
@@ -76,6 +75,7 @@ void processNewVisitFormSuccess() throws Exception {
 		mockMvc
 			.perform(post("/owners/{ownerId}/pets/{petId}/visits/new", TEST_OWNER_ID, TEST_PET_ID)
 				.param("name", "George")
+				.param("date", "2026-04-21")
 				.param("description", "Visit Description"))
 			.andExpect(status().is3xxRedirection())
 			.andExpect(view().name("redirect:/owners/{ownerId}"));