Fix CronExpression roll-forward issue

This commit makes sure that BitsCronField rolls the date forward in
cases where we cannot find a next bit to elapse to.

Closes: gh-26964

spring-context/src/main/java/org/springframework/scheduling/support/BitsCronField.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -192,6 +192,11 @@ final class BitsCronField extends CronField {
 			while (current != next && count++ < CronExpression.MAX_ATTEMPTS) {
 				temporal = type().elapseUntil(temporal, next);
 				current = type().get(temporal);
+				next = nextSetBit(current);
+				if (next == -1) {
+					temporal = type().rollForward(temporal);
+					next = nextSetBit(0);
+				}
 			}
 			if (count >= CronExpression.MAX_ATTEMPTS) {
 				return null;

spring-context/src/test/java/org/springframework/scheduling/support/CronExpressionTests.java

@@ -497,6 +497,29 @@ class CronExpressionTests {
 		assertThat(actual.getDayOfMonth()).isEqualTo(13);
 	}
 
+	@Test
+	public void everyTenDays() {
+		CronExpression cronExpression = CronExpression.parse("0 15 12 */10 1-8 5");
+
+		LocalDateTime last = LocalDateTime.parse("2021-04-30T12:14:59");
+		LocalDateTime expected = LocalDateTime.parse("2021-05-21T12:15");
+		LocalDateTime actual = cronExpression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+
+		last = actual;
+		expected = LocalDateTime.parse("2021-06-11T12:15");
+		actual = cronExpression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+
+		last = actual;
+		expected = LocalDateTime.parse("2022-01-21T12:15");
+		actual = cronExpression.next(last);
+		assertThat(actual).isNotNull();
+		assertThat(actual).isEqualTo(expected);
+	}
+
 	@Test
 	void yearly() {
 		CronExpression expression = CronExpression.parse("@yearly");