Consider parent when application is built and then run

Previously, the parent context was only considered when the builder
was used to run the application. If the application was built using
the builder and then run using SpringApplication.run, the parent
context was not considered.

This commit updates the builder to consider the parent both when it's
used to run the application and when it's used to build the
application that will later be run via SpringApplication.run

Closes gh-4014

Author: wilkinsona

spring-boot/src/main/java/org/springframework/boot/builder/SpringApplicationBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2015 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.
@@ -59,6 +59,7 @@
  * SpringApplication instead.
  *
  * @author Dave Syer
+ * @author Andy Wilkinson
  */
 public class SpringApplicationBuilder {
 
@@ -80,6 +81,8 @@ public class SpringApplicationBuilder {
 
 	private boolean registerShutdownHookApplied;
 
+	private boolean configuredAsChild = false;
+
 	public SpringApplicationBuilder(Object... sources) {
 		this.application = createSpringApplication(sources);
 	}
@@ -120,19 +123,11 @@ public SpringApplication application() {
 	 * @return an application context created from the current state
 	 */
 	public ConfigurableApplicationContext run(String... args) {
-		if (this.parent != null) {
-			// If there is a parent don't register a shutdown hook
-			if (!this.registerShutdownHookApplied) {
-				this.application.setRegisterShutdownHook(false);
-			}
-			// initialize it and make sure it is added to the current context
-			initializers(new ParentContextApplicationContextInitializer(
-					this.parent.run(args)));
-		}
 		if (this.running.get()) {
 			// If already created we just return the existing context
 			return this.context;
 		}
+		configureAsChildIfNecessary();
 		if (this.running.compareAndSet(false, true)) {
 			synchronized (this.running) {
 				// If not already running copy the sources over and then run.
@@ -142,11 +137,23 @@ public ConfigurableApplicationContext run(String... args) {
 		return this.context;
 	}
 
+	private void configureAsChildIfNecessary() {
+		if (this.parent != null && !this.configuredAsChild) {
+			this.configuredAsChild = true;
+			if (!this.registerShutdownHookApplied) {
+				this.application.setRegisterShutdownHook(false);
+			}
+			initializers(
+					new ParentContextApplicationContextInitializer(this.parent.run()));
+		}
+	}
+
 	/**
 	 * Returns a fully configured {@link SpringApplication} that is ready to run.
 	 * @return the fully configured {@link SpringApplication}.
 	 */
 	public SpringApplication build() {
+		configureAsChildIfNecessary();
 		this.application.setSources(this.sources);
 		return this.application;
 	}
@@ -405,7 +412,7 @@ private Map<String, Object> getMapFromProperties(Properties properties) {
 	/**
 	 * Default properties for the environment. Multiple calls to this method are
 	 * cumulative.
-	 * @param defaults
+	 * @param defaults the default properties
 	 * @return the current builder
 	 * @see SpringApplicationBuilder#properties(String...)
 	 */

spring-boot/src/test/java/org/springframework/boot/builder/SpringApplicationBuilderTests.java

@@ -98,7 +98,7 @@ public void specificApplicationContextClass() throws Exception {
 	}
 
 	@Test
-	public void parentContextCreation() throws Exception {
+	public void parentContextCreationThatIsRunDirectly() throws Exception {
 		SpringApplicationBuilder application = new SpringApplicationBuilder(
 				ChildConfig.class).contextClass(SpyApplicationContext.class);
 		application.parent(ExampleConfig.class);
@@ -109,6 +109,18 @@ public void parentContextCreation() throws Exception {
 				equalTo(false));
 	}
 
+	@Test
+	public void parentContextCreationThatIsBuiltThenRun() throws Exception {
+		SpringApplicationBuilder application = new SpringApplicationBuilder(
+				ChildConfig.class).contextClass(SpyApplicationContext.class);
+		application.parent(ExampleConfig.class);
+		this.context = application.build().run();
+		verify(((SpyApplicationContext) this.context).getApplicationContext())
+				.setParent(any(ApplicationContext.class));
+		assertThat(((SpyApplicationContext) this.context).getRegisteredShutdownHook(),
+				equalTo(false));
+	}
+
 	@Test
 	public void parentContextCreationWithChildShutdown() throws Exception {
 		SpringApplicationBuilder application = new SpringApplicationBuilder(