Refine AliasFor usage

This commit makes sure to use `getAliasedStringArray` rather than
`getStringArray` as the latter does not work with ASM. While this will
probably be fixed in the core framework, this commit also adds dedicated
tests with ASM to ensure that the code works as expected.

Closes gh-6337

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/domain/EntityScanPackages.java

@@ -155,7 +155,8 @@ public class EntityScanPackages {
 		private Set<String> getPackagesToScan(AnnotationMetadata metadata) {
 			AnnotationAttributes attributes = AnnotationAttributes.fromMap(
 					metadata.getAnnotationAttributes(EntityScan.class.getName()));
-			String[] basePackages = attributes.getStringArray("basePackages");
+			String[] basePackages = attributes.getAliasedStringArray("basePackages",
+					EntityScan.class, metadata.getClassName());
 			Class<?>[] basePackageClasses = attributes
 					.getClassArray("basePackageClasses");
 			Set<String> packagesToScan = new LinkedHashSet<String>();

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/domain/EntityScanPackagesTests.java

@@ -24,6 +24,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.annotation.AnnotationConfigurationException;
@@ -112,6 +113,17 @@ public class EntityScanPackagesTests {
 		assertThat(packages.getPackageNames()).containsExactly("a");
 	}
 
+	@Test
+	public void entityScanAnnotationWhenHasValueAttributeShouldSetupPackagesAsm()
+			throws Exception {
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.registerBeanDefinition("entityScanValueConfig",
+				new RootBeanDefinition(EntityScanValueConfig.class.getName()));
+		this.context.refresh();
+		EntityScanPackages packages = EntityScanPackages.get(this.context);
+		assertThat(packages.getPackageNames()).containsExactly("a");
+	}
+
 	@Test
 	public void entityScanAnnotationWhenHasBasePackagesAttributeShouldSetupPackages()
 			throws Exception {

spring-boot/src/main/java/org/springframework/boot/orm/jpa/EntityScanRegistrar.java

 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 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.
@@ -63,7 +63,8 @@ class EntityScanRegistrar implements ImportBeanDefinitionRegistrar {
 	private Set<String> getPackagesToScan(AnnotationMetadata metadata) {
 		AnnotationAttributes attributes = AnnotationAttributes
 				.fromMap(metadata.getAnnotationAttributes(EntityScan.class.getName()));
-		String[] basePackages = attributes.getStringArray("basePackages");
+		String[] basePackages = attributes.getAliasedStringArray("basePackages",
+				EntityScan.class, metadata.getClassName());
 		Class<?>[] basePackageClasses = attributes.getClassArray("basePackageClasses");
 		Set<String> packagesToScan = new LinkedHashSet<String>();
 		packagesToScan.addAll(Arrays.asList(basePackages));

spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletComponentScanRegistrar.java

@@ -76,7 +76,8 @@ class ServletComponentScanRegistrar implements ImportBeanDefinitionRegistrar {
 	private Set<String> getPackagesToScan(AnnotationMetadata metadata) {
 		AnnotationAttributes attributes = AnnotationAttributes.fromMap(
 				metadata.getAnnotationAttributes(ServletComponentScan.class.getName()));
-		String[] basePackages = attributes.getStringArray("basePackages");
+		String[] basePackages = attributes.getAliasedStringArray("basePackages",
+				ServletComponentScan.class, metadata.getClassName());
 		Class<?>[] basePackageClasses = attributes.getClassArray("basePackageClasses");
 		Set<String> packagesToScan = new LinkedHashSet<String>();
 		packagesToScan.addAll(Arrays.asList(basePackages));

spring-boot/src/test/java/org/springframework/boot/orm/jpa/EntityScanTests.java

@@ -26,6 +26,7 @@ import org.junit.rules.ExpectedException;
 
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -61,6 +62,15 @@ public class EntityScanTests {
 		assertSetPackagesToScan("com.mycorp.entity");
 	}
 
+	@Test
+	public void simpleValueAsm() throws Exception {
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.registerBeanDefinition("valueConfig",
+				new RootBeanDefinition(ValueConfig.class.getName()));
+		this.context.refresh();
+		assertSetPackagesToScan("com.mycorp.entity");
+	}
+
 	@Test
 	public void needsEntityManageFactory() throws Exception {
 		this.thrown.expect(IllegalStateException.class);

spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletComponentScanRegistrarTests.java

@@ -21,6 +21,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.annotation.AnnotationConfigurationException;
@@ -57,6 +58,18 @@ public class ServletComponentScanRegistrarTests {
 				"com.example.bar");
 	}
 
+	@Test
+	public void packagesConfiguredWithValueAsm() {
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.registerBeanDefinition("valuePackages",
+				new RootBeanDefinition(ValuePackages.class.getName()));
+		this.context.refresh();
+		ServletComponentRegisteringPostProcessor postProcessor = this.context
+				.getBean(ServletComponentRegisteringPostProcessor.class);
+		assertThat(postProcessor.getPackagesToScan()).contains("com.example.foo",
+				"com.example.bar");
+	}
+
 	@Test
 	public void packagesConfiguredWithBackPackages() {
 		this.context = new AnnotationConfigApplicationContext(BasePackages.class);