Fix sorting of auto configuration classes on JDK 8

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/AutoConfigurationSorter.java

 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2014 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.
@@ -15,7 +15,6 @@
  */
 
 package org.springframework.boot.autoconfigure;
-
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -38,6 +37,7 @@ import org.springframework.core.type.classreading.MetadataReader;
 import org.springframework.core.type.classreading.MetadataReaderFactory;
 import org.springframework.util.Assert;
 
+
 /**
  * Sort {@link EnableAutoConfiguration auto-configuration} classes into priority order by
  * reading {@link Ordered} and {@link AutoConfigureAfter} annotations (without loading
@@ -63,6 +63,9 @@ class AutoConfigurationSorter {
 		List<String> orderedClassNames = new ArrayList<String>(classNames);
 
 		// Sort initially by order
+		Collections.sort(orderedClassNames);
+
+		// Then sort by order
 		Collections.sort(orderedClassNames, new Comparator<String>() {
 			@Override
 			public int compare(String o1, String o2) {
@@ -130,7 +133,7 @@ class AutoConfigurationSorter {
 		}
 
 		public Set<String> getClassesRequestedAfter(String className) {
-			Set<String> rtn = new HashSet<String>();
+			Set<String> rtn = new LinkedHashSet<String>();
 			rtn.addAll(get(className).getAfter());
 			for (Map.Entry<String, AutoConfigurationClass> entry : this.classes
 					.entrySet()) {

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

 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2014 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.
@@ -94,6 +94,14 @@ public class AutoConfigurationSorterTests {
 		assertThat(actual, nameMatcher(C, W, B, A, X));
 	}
 
+	@Test
+	public void byAutoConfigureMixedBeforeAndAfterWithDifferentInputOrder()
+			throws Exception {
+		List<String> actual = this.sorter
+				.getInPriorityOrder(Arrays.asList(W, X, A, B, C));
+		assertThat(actual, nameMatcher(C, W, B, A, X));
+	}
+
 	@Test
 	public void byAutoConfigureAfterWithMissing() throws Exception {
 		List<String> actual = this.sorter.getInPriorityOrder(Arrays.asList(A, B));