BAEL-3801: Update spring-boot-rest to use latest Spring Boot version (#8740)

* BAEL-3801: Upgrade to Spring Boot 2.2.2

* BAEL-3801: Fix JacksonMarshaller

* BAEL-3801: Get rid of deprecated HATEOAS classes

* BAEL-3801: Fix H2 tables drop order

* BAEL-3801: Remove commented property from pom.xml

spring-boot-rest/pom.xml

@@ -95,7 +95,6 @@
         <guava.version>27.0.1-jre</guava.version>
         <xstream.version>1.4.11.1</xstream.version>
         <modelmapper.version>2.3.5</modelmapper.version>
-        <spring-boot.version>2.1.9.RELEASE</spring-boot.version>
     </properties>
     
 </project>

spring-boot-rest/src/main/java/com/baeldung/persistence/config/CustomH2Dialect.java

@@ -0,0 +1,26 @@
+package com.baeldung.persistence.config;
+
+import org.hibernate.dialect.H2Dialect;
+
+/**
+ * Since H2 1.4.200. the behavior of the drop table commands has changed.
+ * Tables are not dropped in a correct order.
+ * Until this is properly fixed directly in Hibernate project,
+ * let's use this custom H2Dialect class to solve this issue.
+ *
+ * @see <a href="https://hibernate.atlassian.net/browse/HHH-13711">https://hibernate.atlassian.net/browse/HHH-13711</a>
+ * @see <a href="https://github.com/hibernate/hibernate-orm/pull/3093">https://github.com/hibernate/hibernate-orm/pull/3093</a>
+ */
+public class CustomH2Dialect extends H2Dialect {
+
+    @Override
+    public boolean dropConstraints() {
+        return true;
+    }
+
+    @Override
+    public boolean supportsIfExistsAfterAlterTable() {
+        return true;
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/persistence/model/Customer.java

@@ -1,14 +1,13 @@
 package com.baeldung.persistence.model;
 
-import java.util.Map;
-
-import org.springframework.hateoas.ResourceSupport;
-
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
+import org.springframework.hateoas.RepresentationModel;
+
+import java.util.Map;
 
 @JsonInclude(Include.NON_NULL)
-public class Customer extends ResourceSupport {
+public class Customer extends RepresentationModel<Customer> {
     private String customerId;
     private String customerName;
     private String companyName;

spring-boot-rest/src/main/java/com/baeldung/persistence/model/Order.java

@@ -1,8 +1,8 @@
 package com.baeldung.persistence.model;
 
-import org.springframework.hateoas.ResourceSupport;
+import org.springframework.hateoas.RepresentationModel;
 
-public class Order extends ResourceSupport {
+public class Order extends RepresentationModel<Order> {
     private String orderId;
     private double price;
     private int quantity;

spring-boot-rest/src/main/java/com/baeldung/web/controller/CustomerController.java

@@ -1,13 +1,13 @@
 package com.baeldung.web.controller;
 
-import static org.springframework.hateoas.mvc.ControllerLinkBuilder.linkTo;
+import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.linkTo;
-import static org.springframework.hateoas.mvc.ControllerLinkBuilder.methodOn;
+import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.methodOn;
 
 import java.util.List;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.hateoas.Link;
-import org.springframework.hateoas.Resources;
+import org.springframework.hateoas.CollectionModel;
 import org.springframework.hateoas.config.EnableHypermediaSupport;
 import org.springframework.hateoas.config.EnableHypermediaSupport.HypermediaType;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -41,7 +41,7 @@ public class CustomerController {
     }
 
     @GetMapping(value = "/{customerId}/orders", produces = { "application/hal+json" })
-    public Resources<Order> getOrdersForCustomer(@PathVariable final String customerId) {
+    public CollectionModel<Order> getOrdersForCustomer(@PathVariable final String customerId) {
         final List<Order> orders = orderService.getAllOrdersForCustomer(customerId);
         for (final Order order : orders) {
             final Link selfLink = linkTo(
@@ -50,12 +50,12 @@ public class CustomerController {
         }
 
         Link link = linkTo(methodOn(CustomerController.class).getOrdersForCustomer(customerId)).withSelfRel();
-        Resources<Order> result = new Resources<>(orders, link);
+        CollectionModel<Order> result = new CollectionModel<>(orders, link);
         return result;
     }
 
     @GetMapping(produces = { "application/hal+json" })
-    public Resources<Customer> getAllCustomers() {
+    public CollectionModel<Customer> getAllCustomers() {
         final List<Customer> allCustomers = customerService.allCustomers();
 
         for (final Customer customer : allCustomers) {
@@ -72,7 +72,7 @@ public class CustomerController {
         }
 
         Link link = linkTo(CustomerController.class).withSelfRel();
-        Resources<Customer> result = new Resources<>(allCustomers, link);
+        CollectionModel<Customer> result = new CollectionModel<>(allCustomers, link);
         return result;
     }
 

spring-boot-rest/src/main/resources/persistence-h2.properties

@@ -17,6 +17,6 @@ jdbc.user=sa
 jdbc.pass=
 
 # hibernate.X
-hibernate.dialect=org.hibernate.dialect.H2Dialect
+hibernate.dialect=com.baeldung.persistence.config.CustomH2Dialect
 hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop

spring-boot-rest/src/test/java/com/baeldung/test/JacksonMarshaller.java

@@ -60,7 +60,7 @@ public final class JacksonMarshaller implements IMarshaller {
         List<T> entities = null;
         try {
             if (clazz.equals(Foo.class)) {
-                entities = objectMapper.readValue(resourcesAsString, new TypeReference<List<Foo>>() {
+                entities = objectMapper.readValue(resourcesAsString, new TypeReference<List<T>>() {
                     // ...
                 });
             } else {