Deprecate support for Velocity

Support for Velocity has been deprecated in Spring Framework 4.3 with
the plan being to remove it in 5.0. This commit deprecates Spring
Boot's support in 1.4, with the plan being to remove it in 2.0.

Closes gh-5276

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/velocity/VelocityAutoConfiguration.java

@@ -55,11 +55,14 @@ import org.springframework.web.servlet.view.velocity.VelocityConfigurer;
  * @author Andy Wilkinson
  * @author Brian Clozel
  * @since 1.1.0
+ * @deprecated In 1.4.0 following the deprecation of Velocity support in Spring Framework
+ * 4.3
  */
 @Configuration
 @ConditionalOnClass({ VelocityEngine.class, VelocityEngineFactory.class })
 @AutoConfigureAfter(WebMvcAutoConfiguration.class)
 @EnableConfigurationProperties(VelocityProperties.class)
+@Deprecated
 public class VelocityAutoConfiguration {
 
 	private static final Log logger = LogFactory.getLog(VelocityAutoConfiguration.class);
@@ -88,6 +91,7 @@ public class VelocityAutoConfiguration {
 		}
 	}
 
+	@Deprecated
 	protected static class VelocityConfiguration {
 
 		@Autowired
@@ -107,6 +111,7 @@ public class VelocityAutoConfiguration {
 
 	@Configuration
 	@ConditionalOnNotWebApplication
+	@Deprecated
 	public static class VelocityNonWebConfiguration extends VelocityConfiguration {
 
 		@Bean
@@ -122,6 +127,7 @@ public class VelocityAutoConfiguration {
 	@Configuration
 	@ConditionalOnClass(Servlet.class)
 	@ConditionalOnWebApplication
+	@Deprecated
 	public static class VelocityWebConfiguration extends VelocityConfiguration {
 
 		@Bean

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/velocity/VelocityProperties.java

@@ -28,7 +28,10 @@ import org.springframework.web.servlet.view.velocity.VelocityViewResolver;
  *
  * @author Andy Wilkinson
  * @since 1.1.0
+ * @deprecated In 1.4.0 following the deprecation of Velocity support in Spring Framework
+ * 4.3
  */
+@Deprecated
 @ConfigurationProperties(prefix = "spring.velocity")
 public class VelocityProperties extends AbstractTemplateViewResolverProperties {
 

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/velocity/VelocityTemplateAvailabilityProvider.java

@@ -29,7 +29,10 @@ import org.springframework.util.ClassUtils;
  *
  * @author Andy Wilkinson
  * @since 1.1.0
+ * @deprecated In 1.4.0 following the deprecation of Velocity support in Spring Framework
+ * 4.3
  */
+@Deprecated
 public class VelocityTemplateAvailabilityProvider
 		implements TemplateAvailabilityProvider {
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/EnableAutoConfigurationImportSelectorTests.java

@@ -45,7 +45,9 @@ import static org.mockito.BDDMockito.given;
  *
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ *
  */
+@SuppressWarnings("deprecation")
 @RunWith(MockitoJUnitRunner.class)
 public class EnableAutoConfigurationImportSelectorTests {
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/velocity/VelocityAutoConfigurationTests.java

@@ -54,6 +54,7 @@ import static org.hamcrest.Matchers.containsString;
  * @author Andy Wilkinson
  * @author Stephane Nicoll
  */
+@SuppressWarnings("deprecation")
 public class VelocityAutoConfigurationTests {
 
 	@Rule

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/velocity/VelocityTemplateAvailabilityProviderTests.java

@@ -30,6 +30,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Andy Wilkinson
  */
+@SuppressWarnings("deprecation")
 public class VelocityTemplateAvailabilityProviderTests {
 
 	private final TemplateAvailabilityProvider provider = new VelocityTemplateAvailabilityProvider();