Polish contribution

Closes gh-4188

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfiguration.java

@@ -18,6 +18,7 @@ package org.springframework.boot.autoconfigure.jersey;
 
 import java.util.Arrays;
 import java.util.EnumSet;
+import java.util.List;
 import java.util.Map.Entry;
 
 import javax.annotation.PostConstruct;
@@ -48,6 +49,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration;
@@ -58,6 +60,7 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
+import org.springframework.core.annotation.AnnotationAwareOrderComparator;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.annotation.Order;
 import org.springframework.util.ClassUtils;
@@ -93,20 +96,14 @@ public class JerseyAutoConfiguration implements ServletContextAware {
 	private ResourceConfig config;
 
 	@Autowired(required = false)
-	private ResourceConfigCustomizer customizer;
+	private List<ResourceConfigCustomizer> customizers;
 
 	private String path;
 
 	@PostConstruct
 	public void path() {
 		resolveApplicationPath();
-		applyCustomConfig();
-	}
-
-	private void applyCustomConfig() {
-		if (this.customizer != null) {
-			this.customizer.customize(this.config);
-		}
+		customize();
 	}
 
 	private void resolveApplicationPath() {
@@ -119,6 +116,15 @@ public class JerseyAutoConfiguration implements ServletContextAware {
 		}
 	}
 
+	private void customize() {
+		if (this.customizers != null) {
+			AnnotationAwareOrderComparator.sort(this.customizers);
+			for (ResourceConfigCustomizer customizer : this.customizers) {
+				customizer.customize(this.config);
+			}
+		}
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	public FilterRegistrationBean requestContextFilter() {
@@ -218,8 +224,9 @@ public class JerseyAutoConfiguration implements ServletContextAware {
 	}
 
 	@ConditionalOnClass(JacksonFeature.class)
+	@ConditionalOnSingleCandidate(ObjectMapper.class)
 	@Configuration
-	static class ObjectMapperResourceConfigCustomizer {
+	static class JacksonResourceConfigCustomizer {
 
 		@Bean
 		public ResourceConfigCustomizer resourceConfigCustomizer() {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jersey/ResourceConfigCustomizer.java

@@ -18,17 +18,19 @@ package org.springframework.boot.autoconfigure.jersey;
 
 import org.glassfish.jersey.server.ResourceConfig;
 
-import org.springframework.context.annotation.Configuration;
-
 /**
- * Callback for customizing the Jersey {@link Configuration}.
+ * Callback interface that can be implemented by beans wishing to customize Jersey's
+ * {@link ResourceConfig} before it is used.
  *
  * @author Eddú Meléndez
  * @since 1.4.0
- * @see JerseyAutoConfiguration
  */
 public interface ResourceConfigCustomizer {
 
+	/**
+	 * Customize the resource config.
+	 * @param config the {@link ResourceConfig} to customize
+	 */
 	void customize(ResourceConfig config);
 
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomObjectMapperProviderTests.java

@@ -47,7 +47,8 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.web.client.RestTemplate;
 
-import static org.junit.Assert.assertEquals;
+import static org.assertj.core.api.Assertions.assertThat;
+
 
 /**
  * @author Eddú Meléndez
@@ -67,8 +68,8 @@ public class JerseyAutoConfigurationCustomObjectMapperProviderTests {
 	public void contextLoads() {
 		ResponseEntity<String> response = this.restTemplate.getForEntity(
 				"http://localhost:" + this.port + "/rest/message", String.class);
-		assertEquals(HttpStatus.OK, response.getStatusCode());
-		assertEquals("{\"subject\":\"Jersey\"}", response.getBody());
+		assertThat(HttpStatus.OK).isEqualTo(response.getStatusCode());
+		assertThat("{\"subject\":\"Jersey\"}").isEqualTo(response.getBody());
 	}
 
 	@MinimalWebConfiguration

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationObjectMapperProviderTests.java

@@ -47,7 +47,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.web.client.RestTemplate;
 
-import static org.junit.Assert.assertEquals;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * @author Eddú Meléndez
@@ -67,8 +67,8 @@ public class JerseyAutoConfigurationObjectMapperProviderTests {
 	public void contextLoads() {
 		ResponseEntity<String> response = this.restTemplate.getForEntity(
 				"http://localhost:" + this.port + "/rest/message", String.class);
-		assertEquals(HttpStatus.OK, response.getStatusCode());
-		assertEquals("{\"subject\":\"Jersey\",\"body\":null}", response.getBody());
+		assertThat(HttpStatus.OK).isEqualTo(response.getStatusCode());
+		assertThat("{\"subject\":\"Jersey\",\"body\":null}").isEqualTo(response.getBody());
 	}
 
 	@MinimalWebConfiguration

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -1754,6 +1754,9 @@ all the endpoints:
 	}
 ----
 
+You can also register an arbitrary number of beans implementing `ResourceConfigCustomizer`
+for more advanced customizations.
+
 All the registered endpoints should be `@Components` with HTTP resource annotations
 (`@GET` etc.), e.g.