Throw Exception from controller methods

modules/swagger-codegen/src/main/resources/JavaSpring/apiController.mustache

@@ -29,7 +29,7 @@ import java.util.concurrent.Callable;
 public class {{classname}}Controller implements {{classname}} {
 {{^jdk8}}{{#operation}}
     public {{#async}}Callable<{{/async}}ResponseEntity<{{>returnTypes}}>{{#async}}>{{/async}} {{operationId}}({{#allParams}}{{>queryParams}}{{>pathParams}}{{>headerParams}}{{>bodyParams}}{{>formParams}}{{#hasMore}},
-        {{/hasMore}}{{/allParams}}) {
+        {{/hasMore}}{{/allParams}}) throws Exception {
         // do some magic!{{^async}}
         return new ResponseEntity<{{>returnTypes}}>(HttpStatus.OK);{{/async}}{{#async}}
         return new Callable<ResponseEntity<{{>returnTypes}}>>() {