make messageConverters lazy in SpringDecoder and SpringEncoder

pom.xml

@@ -258,6 +258,11 @@
 			  <artifactId>bootstrap</artifactId>
 			  <version>3.2.0</version>
 		    </dependency>
+            <dependency>
+                <groupId>javax.inject</groupId>
+                <artifactId>javax.inject</artifactId>
+                <version>1</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>
 

spring-cloud-netflix-core/pom.xml

@@ -136,6 +136,10 @@
 			<scope>test</scope>
 		</dependency>
 		<dependency>
+			<groupId>javax.inject</groupId>
+			<artifactId>javax.inject</artifactId>
+		</dependency>
+        <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
         </dependency>

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/feign/SpringDecoder.java

@@ -17,6 +17,8 @@ import feign.Response;
 import feign.codec.DecodeException;
 import feign.codec.Decoder;
 
+import javax.inject.Provider;
+
 import static org.springframework.cloud.netflix.feign.FeignUtils.getHttpHeaders;
 
 /**
@@ -25,7 +27,7 @@ import static org.springframework.cloud.netflix.feign.FeignUtils.getHttpHeaders;
 public class SpringDecoder implements Decoder {
 
     @Autowired
-    HttpMessageConverters messageConverters;
+    Provider<HttpMessageConverters> messageConverters;
 
 	public SpringDecoder() {
 	}
@@ -35,7 +37,7 @@ public class SpringDecoder implements Decoder {
 		if (type instanceof Class || type instanceof ParameterizedType) {
             @SuppressWarnings({ "unchecked", "rawtypes" })
             HttpMessageConverterExtractor<?> extractor = new HttpMessageConverterExtractor(
-                    type, messageConverters.getConverters());
+                    type, messageConverters.get().getConverters());
 
             return extractor.extractData(new FeignResponseAdapter(response));
         }

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/feign/SpringEncoder.java

@@ -15,6 +15,7 @@ import org.springframework.http.HttpOutputMessage;
 import org.springframework.http.MediaType;
 import org.springframework.http.converter.HttpMessageConverter;
 
+import javax.inject.Provider;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
@@ -29,7 +30,7 @@ public class SpringEncoder implements Encoder {
 	private static final Logger logger = LoggerFactory.getLogger(SpringEncoder.class);
 
     @Autowired
-    HttpMessageConverters messageConverters;
+    Provider<HttpMessageConverters> messageConverters;
 
 	public SpringEncoder() {
 	}
@@ -48,7 +49,7 @@ public class SpringEncoder implements Encoder {
 				requestContentType = MediaType.valueOf(type);
 			}
 
-			for (HttpMessageConverter<?> messageConverter : messageConverters.getConverters()) {
+			for (HttpMessageConverter<?> messageConverter : messageConverters.get().getConverters()) {
 				if (messageConverter.canWrite(requestType, requestContentType)) {
 					if (logger.isDebugEnabled()) {
 						if (requestContentType != null) {