fix: set default character encoding to utf8 fixes #406

Author: oliemansm

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/GraphQLMultipartInvocationInputParser.java

@@ -109,6 +109,7 @@ private Optional<Part> findPart(Map<String, List<Part>> parts) {
         .filter(parts::containsKey)
         .map(key -> getPart(parts, key))
         .findFirst()
+        .filter(Optional::isPresent)
         .map(Optional::get);
   }
 

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/GraphQLPostInvocationInputParser.java

@@ -10,7 +10,6 @@
 import graphql.kickstart.servlet.input.GraphQLInvocationInputFactory;
 import java.io.IOException;
 import java.util.List;
-import java.util.stream.Collectors;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/HttpRequestHandlerImpl.java

@@ -4,6 +4,7 @@
 import graphql.GraphQLException;
 import graphql.kickstart.execution.input.GraphQLInvocationInput;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
@@ -32,14 +33,17 @@ public HttpRequestHandlerImpl(
   @Override
   public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException {
     try {
+      if (request.getCharacterEncoding() == null) {
+        request.setCharacterEncoding(StandardCharsets.UTF_8.name());
+      }
       GraphQLInvocationInputParser invocationInputParser =
           GraphQLInvocationInputParser.create(
               request,
               configuration.getInvocationInputFactory(),
               configuration.getObjectMapper(),
               configuration.getContextSetting());
       GraphQLInvocationInput invocationInput =
-          invocationInputParser.getGraphQLInvocationInput(request, response);
+          invocationInputParser.  getGraphQLInvocationInput(request, response);
       requestInvoker.execute(invocationInput, request, response);
     } catch (GraphQLException | JsonProcessingException e) {
       response.setStatus(STATUS_BAD_REQUEST);