Raise the minimum supported version of Java to 17

Closes gh-749

samples/junit5/build.gradle

@@ -16,8 +16,8 @@ repositories {
 
 group = 'com.example'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 ext {
 	snippetsDir = file('build/generated-snippets')

samples/rest-assured/build.gradle

@@ -16,8 +16,8 @@ repositories {
 
 group = 'com.example'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 ext {
 	snippetsDir = file('build/generated-snippets')

samples/rest-notes-slate/build.gradle

@@ -15,8 +15,8 @@ repositories {
 
 group = 'com.example'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 ext {
 	snippetsDir = file('build/generated-snippets')

samples/rest-notes-spring-data-rest/pom.xml

@@ -17,7 +17,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>1.8</java.version>
+		<java.version>17</java.version>
 		<spring-restdocs.version>3.0.0-SNAPSHOT</spring-restdocs.version>
 	</properties>
 

samples/rest-notes-spring-hateoas/build.gradle

@@ -16,8 +16,8 @@ repositories {
 
 group = 'com.example'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 ext {
 	snippetsDir = file('build/generated-snippets')

samples/testng/build.gradle

@@ -16,8 +16,8 @@ repositories {
 
 group = 'com.example'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 ext {
 	snippetsDir = file('build/generated-snippets')

samples/web-test-client/build.gradle

@@ -14,8 +14,8 @@ repositories {
 
 group = 'com.example'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 ext {
 	snippetsDir = file('build/generated-snippets')