Polish "Check for multiple processors in OnClassCondition"

Closes gh-16115

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java

@@ -46,26 +46,21 @@ class OnClassCondition extends FilteringSpringBootCondition {
 	@Override
 	protected final ConditionOutcome[] getOutcomes(String[] autoConfigurationClasses,
 			AutoConfigurationMetadata autoConfigurationMetadata) {
-		// Split the work and perform half in a background thread. Using a single
+		// Split the work and perform half in a background thread if more than one
-		// additional thread seems to offer the best performance. More threads make
+		// processor is available. Using a single additional thread seems to offer the
-		// things worse
+		// best performance. More threads make things worse.
 		if (Runtime.getRuntime().availableProcessors() > 1) {
 			return resolveOutcomesThreaded(autoConfigurationClasses,
 					autoConfigurationMetadata);
 		}
 		else {
-			return resolveOutcomes(autoConfigurationClasses, autoConfigurationMetadata);
+			OutcomesResolver outcomesResolver = new StandardOutcomesResolver(
+					autoConfigurationClasses, 0, autoConfigurationClasses.length,
+					autoConfigurationMetadata, getBeanClassLoader());
+			return outcomesResolver.resolveOutcomes();
 		}
 	}
 
-	private ConditionOutcome[] resolveOutcomes(String[] autoConfigurationClasses,
-			AutoConfigurationMetadata autoConfigurationMetadata) {
-		OutcomesResolver outcomesResolver = createOutcomesResolver(
-				autoConfigurationClasses, 0, autoConfigurationClasses.length,
-				autoConfigurationMetadata);
-		return outcomesResolver.resolveOutcomes();
-	}
-
 	private ConditionOutcome[] resolveOutcomesThreaded(String[] autoConfigurationClasses,
 			AutoConfigurationMetadata autoConfigurationMetadata) {
 		int split = autoConfigurationClasses.length / 2;