Add JodaModule bean if detected on classpath

Fixes gh-146

spring-boot-autoconfigure/pom.xml

@@ -26,6 +26,11 @@
 			<artifactId>jackson-databind</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.datatype</groupId>
+			<artifactId>jackson-datatype-joda</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>commons-dbcp</groupId>
 			<artifactId>commons-dbcp</artifactId>

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/HttpMessageConvertersAutoConfiguration.java

@@ -23,11 +23,11 @@ import java.util.List;
 
 import javax.annotation.PostConstruct;
 
+import org.joda.time.DateTime;
 import org.springframework.beans.factory.BeanFactoryUtils;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.annotation.Bean;
@@ -38,6 +38,7 @@ import org.springframework.http.converter.json.MappingJackson2HttpMessageConvert
 
 import com.fasterxml.jackson.databind.Module;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.joda.JodaModule;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for {@link HttpMessageConverter}s.
@@ -60,7 +61,17 @@ public class HttpMessageConvertersAutoConfiguration {
 	}
 
 	@Configuration
-	@ConditionalOnBean(ObjectMapper.class)
+	@ConditionalOnClass({ JodaModule.class, DateTime.class })
+	protected static class JodaModuleConfiguration {
+
+		@Bean
+		public JodaModule jodaModule() {
+			return new JodaModule();
+		}
+
+	}
+
+	@Configuration
 	@ConditionalOnClass(ObjectMapper.class)
 	protected static class ObjectMappers {
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/HttpMessageConvertersAutoConfigurationTests.java

@@ -37,6 +37,7 @@ import com.fasterxml.jackson.databind.module.SimpleModule;
 
 import static org.hamcrest.Matchers.hasItem;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Matchers.argThat;
 import static org.mockito.Mockito.verify;
@@ -72,6 +73,14 @@ public class HttpMessageConvertersAutoConfigurationTests {
 		assertTrue(converters.getConverters().contains(converter));
 	}
 
+	@Test
+	public void defaultJacksonModules() throws Exception {
+		this.context = new AnnotationConfigApplicationContext();
+		this.context.register(HttpMessageConvertersAutoConfiguration.class);
+		this.context.refresh();
+		assertNotNull(this.context.getBean("jodaModule", Module.class));
+	}
+
 	@Test
 	public void customJacksonModules() throws Exception {
 		this.context = new AnnotationConfigApplicationContext();
@@ -82,7 +91,8 @@ public class HttpMessageConvertersAutoConfigurationTests {
 
 		@SuppressWarnings({ "unchecked", "unused" })
 		ObjectMapper result = verify(mapper).registerModules(
-				(Iterable<Module>) argThat(hasItem(this.context.getBean(Module.class))));
+				(Iterable<Module>) argThat(hasItem(this.context.getBean("jacksonModule",
+						Module.class))));
 	}
 
 	@Test