Allow multiple MessageSources that are comma separated.

Fixes gh-532, Fixes gh-506

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

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.autoconfigure;
 
+import static org.springframework.util.StringUtils.commaDelimitedListToStringArray;
+import static org.springframework.util.StringUtils.trimAllWhitespace;
+
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.context.EnvironmentAware;
@@ -26,6 +29,7 @@ import org.springframework.context.support.ResourceBundleMessageSource;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
 import org.springframework.core.env.Environment;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for {@link MessageSource}.
@@ -48,7 +52,9 @@ public class MessageSourceAutoConfiguration implements EnvironmentAware {
 	public MessageSource messageSource() {
 		ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
 		String basename = this.environment.getProperty("basename", "messages");
-		messageSource.setBasename(basename);
+		if (StringUtils.hasText(basename)) {
+			messageSource.setBasenames(commaDelimitedListToStringArray(trimAllWhitespace(basename)));
+		}
 		String encoding = this.environment.getProperty("encoding", "utf-8");
 		messageSource.setDefaultEncoding(encoding);
 		return messageSource;

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

@@ -16,14 +16,14 @@
 
 package org.springframework.boot.autoconfigure;
 
+import static org.junit.Assert.assertEquals;
+
 import java.util.Locale;
 
 import org.junit.Test;
 import org.springframework.boot.test.EnvironmentTestUtils;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
-import static org.junit.Assert.assertEquals;
-
 /**
  * Tests for {@link MessageSourceAutoConfiguration}.
  *
@@ -55,6 +55,20 @@ public class MessageSourceAutoConfigurationTests {
 				this.context.getMessage("foo", null, "Foo message", Locale.UK));
 	}
 
+	@Test
+	public void testMultipleMessageSourceCreated() throws Exception {
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.register(MessageSourceAutoConfiguration.class,
+				PropertyPlaceholderAutoConfiguration.class);
+		EnvironmentTestUtils.addEnvironment(this.context,
+				"spring.messages.basename:test/messages,test/messages2");
+		this.context.refresh();
+		assertEquals("bar",
+				this.context.getMessage("foo", null, "Foo message", Locale.UK));
+		assertEquals("bar-bar",
+				this.context.getMessage("foo-foo", null, "Foo-Foo message", Locale.UK));
+	}
+
 	@Test
 	public void testBadEncoding() throws Exception {
 		this.context = new AnnotationConfigApplicationContext();

spring-boot-autoconfigure/src/test/resources/test/messages2.properties

@@ -0,0 +1 @@
+foo-foo=bar-bar