Fix ManagementContextConfiguration @order support

Update `ManagementContextConfigurationsImportSelector` to instantiate
classes so that order annotations are respected.

Fixes spring-projectsgh-7814

Author: philwebb

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ManagementContextConfigurationsImportSelector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -19,6 +19,7 @@
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 
 import org.springframework.beans.factory.BeanClassLoaderAware;
 import org.springframework.context.annotation.DeferredImportSelector;
@@ -27,6 +28,7 @@
 import org.springframework.core.annotation.Order;
 import org.springframework.core.io.support.SpringFactoriesLoader;
 import org.springframework.core.type.AnnotationMetadata;
+import org.springframework.util.ClassUtils;
 
 /**
  * Selects configuration classes for the management context configuration. Entries are
@@ -47,11 +49,26 @@ class ManagementContextConfigurationsImportSelector
 	@Override
 	public String[] selectImports(AnnotationMetadata metadata) {
 		// Find all possible auto configuration classes, filtering duplicates
-		List<String> factories = new ArrayList<String>(
-				new LinkedHashSet<String>(SpringFactoriesLoader.loadFactoryNames(
-						ManagementContextConfiguration.class, this.classLoader)));
-		AnnotationAwareOrderComparator.sort(factories);
-		return factories.toArray(new String[0]);
+		List<String> names = loadFactoryNames();
+		Set<Class<?>> classes = new LinkedHashSet<Class<?>>();
+		for (String factoryName : names) {
+			classes.add(ClassUtils.resolveClassName(factoryName, this.classLoader));
+		}
+		return getSortedClassNames(new ArrayList<Class<?>>(classes));
+	}
+
+	protected List<String> loadFactoryNames() {
+		return SpringFactoriesLoader
+				.loadFactoryNames(ManagementContextConfiguration.class, this.classLoader);
+	}
+
+	private String[] getSortedClassNames(List<Class<?>> classes) {
+		AnnotationAwareOrderComparator.sort(classes);
+		List<String> names = new ArrayList<String>();
+		for (Class<?> sourceClass : classes) {
+			names.add(sourceClass.getName());
+		}
+		return names.toArray(new String[names.size()]);
 	}
 
 	@Override

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/ManagementContextConfigurationsImportSelectorTests.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+
+import org.springframework.core.annotation.Order;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ManagementContextConfigurationsImportSelector}.
+ *
+ * @author Phillip Webb
+ */
+public class ManagementContextConfigurationsImportSelectorTests {
+
+	@Test
+	public void selectImportsShouldOrderResult() throws Exception {
+		String[] imports = new TestManagementContextConfigurationsImportSelector()
+				.selectImports(null);
+		assertThat(imports).containsExactly(A.class.getName(), B.class.getName(),
+				C.class.getName());
+	}
+
+	private static class TestManagementContextConfigurationsImportSelector
+			extends ManagementContextConfigurationsImportSelector {
+
+		@Override
+		protected List<String> loadFactoryNames() {
+			return Arrays.asList(C.class.getName(), A.class.getName(), B.class.getName());
+		}
+
+	}
+
+	@Order(1)
+	private static class A {
+
+	}
+
+	@Order(2)
+	private static class B {
+
+	}
+
+	@Order(3)
+	private static class C {
+
+	}
+
+}