fix: update Jackson imports for Spring Boot 4.0 / Jackson 3.0 compatibility

src/main/java/io/pactflow/example/kafka/ProductMessageBuilder.java

@@ -1,8 +1,8 @@
 package io.pactflow.example.kafka;
 
 import org.springframework.messaging.Message;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.core.JacksonException;
+import tools.jackson.databind.ObjectMapper;
 import org.springframework.kafka.support.KafkaHeaders;
 import org.springframework.messaging.support.MessageBuilder;
 
@@ -15,7 +15,7 @@ public ProductMessageBuilder withProduct(ProductEvent product) {
     return this;
   }
 
-  public Message<String> build() throws JsonProcessingException {
+  public Message<String> build() throws JacksonException {
     return MessageBuilder.withPayload(this.mapper.writeValueAsString(this.product))
         .setHeader(KafkaHeaders.TOPIC, "products").setHeader("Content-Type", "application/json; charset=utf-8")
         .build();

src/main/java/io/pactflow/example/kafka/ProductRepository.java

@@ -1,6 +1,6 @@
 package io.pactflow.example.kafka;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
+import tools.jackson.core.JacksonException;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -22,7 +22,7 @@ public void save(final ProductEvent product) {
       Message<String> message = new ProductMessageBuilder().withProduct(product).build();
       this.template.send(message);
 
-    } catch (final JsonProcessingException e) {
+    } catch (final JacksonException e) {
       logger.error("unable to serialise product to JSON", e);
     }
   }

src/test/java/io/pactflow/example/kafka/ProductsKafkaProducerTest.java

@@ -15,7 +15,7 @@
 
 import java.util.HashMap;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
+import tools.jackson.core.JacksonException;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.TestTemplate;
@@ -42,15 +42,15 @@ void before(PactVerificationContext context) {
   }
 
   @PactVerifyProvider("a product event update")
-  public MessageAndMetadata productUpdateEvent() throws JsonProcessingException {
+  public MessageAndMetadata productUpdateEvent() throws JacksonException {
     ProductEvent product = new ProductEvent("id1", "product name", "product type", "v1", EventType.UPDATED, 15.00);
     Message<String> message = new ProductMessageBuilder().withProduct(product).build();
 
     return generateMessageAndMetadata(message);
   }
 
   @PactVerifyProvider("a product created event")
-  public MessageAndMetadata productCreatedEvent() throws JsonProcessingException {
+  public MessageAndMetadata productCreatedEvent() throws JacksonException {
     ProductEvent product = new ProductEvent("id1", "product name", "product type", "v1", EventType.CREATED, 27.00);
     Message<String> message = new ProductMessageBuilder().withProduct(product).build();