DATACMNS-1755 - Drop Java 8 check.

Remove explicit Java 8 check since it is now the minimum supported
version.

Original pull request: #448.

src/main/java/org/springframework/data/convert/Jsr310Converters.java

@@ -30,7 +30,6 @@ import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.Date;
 import java.util.List;
 
@@ -38,7 +37,6 @@ import javax.annotation.Nonnull;
 
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.lang.NonNull;
-import org.springframework.util.ClassUtils;
 
 /**
  * Helper class to register JSR-310 specific {@link Converter} implementations in case the we're running on Java 8.
@@ -51,8 +49,6 @@ import org.springframework.util.ClassUtils;
  */
 public abstract class Jsr310Converters {
 
-	private static final boolean JAVA_8_IS_PRESENT = ClassUtils.isPresent("java.time.LocalDateTime",
-			Jsr310Converters.class.getClassLoader());
 	private static final List<Class<?>> CLASSES = Arrays.asList(LocalDateTime.class, LocalDate.class, LocalTime.class,
 			Instant.class, ZoneId.class, Duration.class, Period.class);
 
@@ -63,10 +59,6 @@ public abstract class Jsr310Converters {
 	 */
 	public static Collection<Converter<?, ?>> getConvertersToRegister() {
 
-		if (!JAVA_8_IS_PRESENT) {
-			return Collections.emptySet();
-		}
-
 		List<Converter<?, ?>> converters = new ArrayList<>();
 		converters.add(DateToLocalDateTimeConverter.INSTANCE);
 		converters.add(LocalDateTimeToDateConverter.INSTANCE);
@@ -93,10 +85,6 @@ public abstract class Jsr310Converters {
 
 	public static boolean supports(Class<?> type) {
 
-		if (!JAVA_8_IS_PRESENT) {
-			return false;
-		}
-
 		return CLASSES.contains(type);
 	}