#1639 - Prepare 2.0 development.

Upgrade to Java 17 and Spring Framework 6. Switch to JakartaEE 9 version of the Servlet API. Drop support for Joda Time.

Configure Kotlin plugin to target JDK 1.8 as it doesn't support 17, yet.

src/docs/java/org/springframework/hateoas/AffordancesSample.java

@@ -17,8 +17,6 @@ package org.springframework.hateoas;
 
 import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.*;
 
-import lombok.var;
-
 import org.springframework.hateoas.SimpleRepresentationModelAssemblerTest.Employee;
 import org.springframework.hateoas.mediatype.Affordances;
 import org.springframework.http.HttpMethod;

src/main/java/org/springframework/hateoas/server/mvc/WebMvcLinkBuilderFactory.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.hateoas.server.mvc;
 
+import jakarta.servlet.ServletContext;
+
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -25,8 +27,6 @@ import java.util.Map;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-import javax.servlet.ServletContext;
-
 import org.springframework.core.MethodParameter;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.format.support.DefaultFormattingConversionService;

src/test/java/org/springframework/hateoas/TestUtils.java

@@ -17,10 +17,10 @@ package org.springframework.hateoas;
 
 import static org.assertj.core.api.Assertions.*;
 
-import java.io.IOException;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
 
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.springframework.mock.web.MockFilterChain;

src/test/java/org/springframework/hateoas/server/mvc/WebMvcLinkBuilderFactoryUnitTest.java

@@ -18,13 +18,13 @@ package org.springframework.hateoas.server.mvc;
 import static org.assertj.core.api.Assertions.*;
 import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.*;
 
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-import org.joda.time.DateTime;
-import org.joda.time.format.ISODateTimeFormat;
 import org.junit.jupiter.api.Test;
 import org.springframework.core.MethodParameter;
 import org.springframework.format.annotation.DateTimeFormat;
@@ -96,11 +96,11 @@ class WebMvcLinkBuilderFactoryUnitTest extends TestUtils {
 	@Test
 	void usesDateTimeFormatForUriBinding() {
 
-		DateTime now = DateTime.now();
+		LocalDateTime now = LocalDateTime.now();
 
 		WebMvcLinkBuilderFactory factory = new WebMvcLinkBuilderFactory();
 		Link link = factory.linkTo(methodOn(SampleController.class).sampleMethod(now)).withSelfRel();
-		assertThat(link.getHref()).endsWith("/sample/" + ISODateTimeFormat.date().print(now));
+		assertThat(link.getHref()).endsWith("/sample/" + now.format(DateTimeFormatter.ISO_DATE));
 	}
 
 	/**
@@ -190,7 +190,7 @@ class WebMvcLinkBuilderFactoryUnitTest extends TestUtils {
 		HttpEntity<?> sampleMethod(@PathVariable("id") Long id, SpecialType parameter);
 
 		@RequestMapping("/sample/{time}")
-		HttpEntity<?> sampleMethod(@PathVariable("time") @DateTimeFormat(iso = ISO.DATE) DateTime time);
+		HttpEntity<?> sampleMethod(@PathVariable("time") @DateTimeFormat(iso = ISO.DATE) LocalDateTime time);
 
 		@RequestMapping("/sample/mapsupport")
 		HttpEntity<?> sampleMethodWithMap(@RequestParam Map<String, String> queryParams);