diff --git a/pom.xml b/pom.xml
index d29355c5f..a33d32e7d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,19 +3,19 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.samples</groupId>
   <artifactId>spring-petclinic</artifactId>
-  <version>2.7.3</version>
+  <version>3.0.0-SNAPSHOT</version>
 
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.7.3</version>
+    <version>3.0.0-SNAPSHOT</version>
   </parent>
   <name>petclinic</name>
 
   <properties>
 
     <!-- Generic properties -->
-    <java.version>1.8</java.version>
+    <java.version>17</java.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
@@ -86,6 +86,7 @@
     <dependency>
       <groupId>org.ehcache</groupId>
       <artifactId>ehcache</artifactId>
+      <classifier>jakarta</classifier>
     </dependency>
 
     <!-- webjars -->
diff --git a/src/main/java/org/springframework/samples/petclinic/model/BaseEntity.java b/src/main/java/org/springframework/samples/petclinic/model/BaseEntity.java
index 4cb9ffc0c..3038bce3a 100644
--- a/src/main/java/org/springframework/samples/petclinic/model/BaseEntity.java
+++ b/src/main/java/org/springframework/samples/petclinic/model/BaseEntity.java
@@ -17,10 +17,10 @@ package org.springframework.samples.petclinic.model;
 
 import java.io.Serializable;
 
-import javax.persistence.GeneratedValue;
-import javax.persistence.GenerationType;
-import javax.persistence.Id;
-import javax.persistence.MappedSuperclass;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
 
 /**
  * Simple JavaBean domain object with an id property. Used as a base class for objects
diff --git a/src/main/java/org/springframework/samples/petclinic/model/NamedEntity.java b/src/main/java/org/springframework/samples/petclinic/model/NamedEntity.java
index 088e52e81..7c2ccb2d6 100644
--- a/src/main/java/org/springframework/samples/petclinic/model/NamedEntity.java
+++ b/src/main/java/org/springframework/samples/petclinic/model/NamedEntity.java
@@ -15,8 +15,8 @@
  */
 package org.springframework.samples.petclinic.model;
 
-import javax.persistence.Column;
-import javax.persistence.MappedSuperclass;
+import jakarta.persistence.Column;
+import jakarta.persistence.MappedSuperclass;
 
 /**
  * Simple JavaBean domain object adds a name property to <code>BaseEntity</code>. Used as
diff --git a/src/main/java/org/springframework/samples/petclinic/model/Person.java b/src/main/java/org/springframework/samples/petclinic/model/Person.java
index 15fabacc3..e41b6ba90 100644
--- a/src/main/java/org/springframework/samples/petclinic/model/Person.java
+++ b/src/main/java/org/springframework/samples/petclinic/model/Person.java
@@ -15,9 +15,9 @@
  */
 package org.springframework.samples.petclinic.model;
 
-import javax.persistence.Column;
-import javax.persistence.MappedSuperclass;
-import javax.validation.constraints.NotEmpty;
+import jakarta.persistence.Column;
+import jakarta.persistence.MappedSuperclass;
+import jakarta.validation.constraints.NotEmpty;
 
 /**
  * Simple JavaBean domain object representing an person.
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/Owner.java b/src/main/java/org/springframework/samples/petclinic/owner/Owner.java
index 52ff1190f..ce3ef931a 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/Owner.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/Owner.java
@@ -18,21 +18,21 @@ package org.springframework.samples.petclinic.owner;
 import java.util.ArrayList;
 import java.util.List;
 
-import javax.persistence.CascadeType;
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.FetchType;
-import javax.persistence.JoinColumn;
-import javax.persistence.OneToMany;
-import javax.persistence.OrderBy;
-import javax.persistence.Table;
-import javax.validation.constraints.Digits;
-import javax.validation.constraints.NotEmpty;
-
 import org.springframework.core.style.ToStringCreator;
 import org.springframework.samples.petclinic.model.Person;
 import org.springframework.util.Assert;
 
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OrderBy;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.Digits;
+import jakarta.validation.constraints.NotEmpty;
+
 /**
  * Simple JavaBean domain object representing an owner.
  *
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java b/src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java
index 3c9632710..f4fc5d91b 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/OwnerController.java
@@ -17,7 +17,7 @@ package org.springframework.samples.petclinic.owner;
 
 import java.util.List;
 import java.util.Map;
-import javax.validation.Valid;
+
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
@@ -33,6 +33,8 @@ import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.servlet.ModelAndView;
 
+import jakarta.validation.Valid;
+
 /**
  * @author Juergen Hoeller
  * @author Ken Krebs
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/Pet.java b/src/main/java/org/springframework/samples/petclinic/owner/Pet.java
index a863c754f..0b0c08ac6 100755
--- a/src/main/java/org/springframework/samples/petclinic/owner/Pet.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/Pet.java
@@ -20,19 +20,19 @@ import java.util.Collection;
 import java.util.LinkedHashSet;
 import java.util.Set;
 
-import javax.persistence.CascadeType;
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.FetchType;
-import javax.persistence.JoinColumn;
-import javax.persistence.ManyToOne;
-import javax.persistence.OneToMany;
-import javax.persistence.OrderBy;
-import javax.persistence.Table;
-
 import org.springframework.format.annotation.DateTimeFormat;
 import org.springframework.samples.petclinic.model.NamedEntity;
 
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OrderBy;
+import jakarta.persistence.Table;
+
 /**
  * Simple business object representing a pet.
  *
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/PetController.java b/src/main/java/org/springframework/samples/petclinic/owner/PetController.java
index 2feae7ee2..9d88f0399 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/PetController.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/PetController.java
@@ -16,7 +16,7 @@
 package org.springframework.samples.petclinic.owner;
 
 import java.util.Collection;
-import javax.validation.Valid;
+
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.ModelMap;
 import org.springframework.util.StringUtils;
@@ -29,6 +29,8 @@ import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 
+import jakarta.validation.Valid;
+
 /**
  * @author Juergen Hoeller
  * @author Ken Krebs
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/PetType.java b/src/main/java/org/springframework/samples/petclinic/owner/PetType.java
index 6f0aa58d3..eeea6a758 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/PetType.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/PetType.java
@@ -15,11 +15,11 @@
  */
 package org.springframework.samples.petclinic.owner;
 
-import javax.persistence.Entity;
-import javax.persistence.Table;
-
 import org.springframework.samples.petclinic.model.NamedEntity;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+
 /**
  * @author Juergen Hoeller Can be Cat, Dog, Hamster...
  */
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/Visit.java b/src/main/java/org/springframework/samples/petclinic/owner/Visit.java
index 8d9116533..d052a4e8d 100755
--- a/src/main/java/org/springframework/samples/petclinic/owner/Visit.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/Visit.java
@@ -17,14 +17,14 @@ package org.springframework.samples.petclinic.owner;
 
 import java.time.LocalDate;
 
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.Table;
-import javax.validation.constraints.NotEmpty;
-
 import org.springframework.format.annotation.DateTimeFormat;
 import org.springframework.samples.petclinic.model.BaseEntity;
 
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotEmpty;
+
 /**
  * Simple JavaBean domain object representing a visit.
  *
diff --git a/src/main/java/org/springframework/samples/petclinic/owner/VisitController.java b/src/main/java/org/springframework/samples/petclinic/owner/VisitController.java
index 610a3c5b4..c823d91f2 100644
--- a/src/main/java/org/springframework/samples/petclinic/owner/VisitController.java
+++ b/src/main/java/org/springframework/samples/petclinic/owner/VisitController.java
@@ -17,8 +17,6 @@ package org.springframework.samples.petclinic.owner;
 
 import java.util.Map;
 
-import javax.validation.Valid;
-
 import org.springframework.stereotype.Controller;
 import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.WebDataBinder;
@@ -28,6 +26,8 @@ import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 
+import jakarta.validation.Valid;
+
 /**
  * @author Juergen Hoeller
  * @author Ken Krebs
diff --git a/src/main/java/org/springframework/samples/petclinic/vet/Specialty.java b/src/main/java/org/springframework/samples/petclinic/vet/Specialty.java
index 3a7347f45..b0b6315fc 100644
--- a/src/main/java/org/springframework/samples/petclinic/vet/Specialty.java
+++ b/src/main/java/org/springframework/samples/petclinic/vet/Specialty.java
@@ -15,11 +15,11 @@
  */
 package org.springframework.samples.petclinic.vet;
 
-import javax.persistence.Entity;
-import javax.persistence.Table;
-
 import org.springframework.samples.petclinic.model.NamedEntity;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+
 /**
  * Models a {@link Vet Vet's} specialty (for example, dentistry).
  *
diff --git a/src/main/java/org/springframework/samples/petclinic/vet/Vet.java b/src/main/java/org/springframework/samples/petclinic/vet/Vet.java
index 014becfce..7a70155c3 100644
--- a/src/main/java/org/springframework/samples/petclinic/vet/Vet.java
+++ b/src/main/java/org/springframework/samples/petclinic/vet/Vet.java
@@ -21,18 +21,18 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
-import javax.persistence.Entity;
-import javax.persistence.FetchType;
-import javax.persistence.JoinColumn;
-import javax.persistence.JoinTable;
-import javax.persistence.ManyToMany;
-import javax.persistence.Table;
-import javax.xml.bind.annotation.XmlElement;
-
 import org.springframework.beans.support.MutableSortDefinition;
 import org.springframework.beans.support.PropertyComparator;
 import org.springframework.samples.petclinic.model.Person;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.JoinTable;
+import jakarta.persistence.ManyToMany;
+import jakarta.persistence.Table;
+import jakarta.xml.bind.annotation.XmlElement;
+
 /**
  * Simple JavaBean domain object representing a veterinarian.
  *
diff --git a/src/main/java/org/springframework/samples/petclinic/vet/Vets.java b/src/main/java/org/springframework/samples/petclinic/vet/Vets.java
index 961e5c096..9b672d25e 100644
--- a/src/main/java/org/springframework/samples/petclinic/vet/Vets.java
+++ b/src/main/java/org/springframework/samples/petclinic/vet/Vets.java
@@ -15,11 +15,12 @@
  */
 package org.springframework.samples.petclinic.vet;
 
-import javax.xml.bind.annotation.XmlElement;
-import javax.xml.bind.annotation.XmlRootElement;
 import java.util.ArrayList;
 import java.util.List;
 
+import jakarta.xml.bind.annotation.XmlElement;
+import jakarta.xml.bind.annotation.XmlRootElement;
+
 /**
  * Simple domain object representing a list of veterinarians. Mostly here to be used for
  * the 'vets' {@link org.springframework.web.servlet.view.xml.MarshallingView}.
diff --git a/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java b/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java
index 5fee8191a..683db21f6 100644
--- a/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java
+++ b/src/test/java/org/springframework/samples/petclinic/model/ValidatorTests.java
@@ -16,16 +16,17 @@
 
 package org.springframework.samples.petclinic.model;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Locale;
+import java.util.Set;
+
 import org.junit.jupiter.api.Test;
 import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
 
-import javax.validation.ConstraintViolation;
-import javax.validation.Validator;
-import java.util.Locale;
-import java.util.Set;
-
-import static org.assertj.core.api.Assertions.assertThat;
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.Validator;
 
 /**
  * @author Michael Isvy Simple test to make sure that Bean Validation is working (useful