Problem: mutations don't work

Can't parse variables passed as a string

Solution: adjust parsing of the request

Author: yrashk

src/main/java/graphql/servlet/GraphQLServlet.java

@@ -14,7 +14,7 @@
  */
 package graphql.servlet;
 
-import com.fasterxml.jackson.annotation.JsonRawValue;
+import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.io.CharStreams;
@@ -165,10 +165,20 @@ public String executeQuery(String query) {
     public static class Request {
         @Getter @Setter
         private String query;
-        @Getter @Setter
+        @Getter
         private Map<String, Object> variables = new HashMap<>();
         @Getter @Setter
         private String operationName;
+
+        @SneakyThrows @JsonProperty("variables")
+        public String getVariablesAsString() {
+            return new ObjectMapper().writeValueAsString(variables);
+        }
+
+        @SneakyThrows
+        public void setVariables(String variables) {
+            this.variables = new ObjectMapper().readValue(variables, new TypeReference<Map<String, Object>>() {});
+        }
     }
 
     @Override