Fix problem when uploading file using form-data in jersey2 client (#12563)

* Fix problem when uploading file using form-data in jersey2 client

* Remove serialization that is not required for most cases

* Small fix

modules/openapi-generator/src/main/resources/Java/libraries/jersey2/ApiClient.mustache

@@ -1218,7 +1218,12 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
         queryParams,
         allHeaderParams,
         cookieParams,
+        {{#hasHttpSignatureMethods}}
         serializeToString(body, formParams, contentType, isBodyNullable),
+        {{/hasHttpSignatureMethods}}
+        {{^hasHttpSignatureMethods}}
+        null,
+        {{/hasHttpSignatureMethods}}
         method,
         target.getUri());
 

samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/ApiClient.java

@@ -1139,7 +1139,7 @@ public class ApiClient extends JavaTimeFormatter {
         queryParams,
         allHeaderParams,
         cookieParams,
-        serializeToString(body, formParams, contentType, isBodyNullable),
+        null,
         method,
         target.getUri());
 

samples/client/petstore/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java

@@ -1139,7 +1139,7 @@ public class ApiClient extends JavaTimeFormatter {
         queryParams,
         allHeaderParams,
         cookieParams,
-        serializeToString(body, formParams, contentType, isBodyNullable),
+        null,
         method,
         target.getUri());
 

samples/openapi3/client/extensions/x-auth-id-alias/java/jersey2-java8/src/main/java/org/openapitools/client/ApiClient.java

@@ -1069,7 +1069,7 @@ public class ApiClient extends JavaTimeFormatter {
         queryParams,
         allHeaderParams,
         cookieParams,
-        serializeToString(body, formParams, contentType, isBodyNullable),
+        null,
         method,
         target.getUri());
 

samples/openapi3/client/petstore/java/jersey2-java8-special-characters/src/main/java/org/openapitools/client/ApiClient.java

@@ -1014,7 +1014,7 @@ public class ApiClient extends JavaTimeFormatter {
         queryParams,
         allHeaderParams,
         cookieParams,
-        serializeToString(body, formParams, contentType, isBodyNullable),
+        null,
         method,
         target.getUri());