fix: serialize JSONObject in OnlyOfficeEditorServlet

# Conflicts:
#	src/main/java/onlyoffice/OnlyOfficeEditorServlet.java

src/main/java/onlyoffice/OnlyOfficeEditorServlet.java

@@ -25,7 +25,11 @@
 import com.atlassian.confluence.user.ConfluenceUser;
 import com.atlassian.confluence.util.velocity.VelocityUtils;
 import com.atlassian.sal.api.message.I18nResolver;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.onlyoffice.manager.settings.SettingsManager;
 import com.onlyoffice.model.documenteditor.Config;
 import com.onlyoffice.model.documenteditor.config.document.DocumentType;
@@ -181,7 +185,7 @@ public void doGet(final HttpServletRequest request, final HttpServletResponse re
                 config.getEditorConfig().setLang(localeManager.getLocale(user).toLanguageTag());
                 config.getEditorConfig().setActionLink(actionData);
 
-                ObjectMapper mapper = new ObjectMapper();
+                ObjectMapper mapper = createObjectMapper();
 
                 context.put("request", request);
                 context.put("configAsHtml", mapper.writeValueAsString(config));
@@ -210,4 +214,19 @@ public void doGet(final HttpServletRequest request, final HttpServletResponse re
             throw new ServletException(e.getMessage(), e);
         }
     }
+
+    private ObjectMapper createObjectMapper() {
+        ObjectMapper objectMapper = new ObjectMapper();
+        SimpleModule module = new SimpleModule();
+        module.addSerializer(JSONObject.class, new JsonSerializer<JSONObject>() {
+            @Override
+            public void serialize(final JSONObject jsonObject, final JsonGenerator jsonGenerator,
+                                  final SerializerProvider serializerProvider) throws IOException {
+                jsonGenerator.writeObject(jsonObject.toMap());
+            }
+        });
+        objectMapper.registerModule(module);
+
+        return objectMapper;
+    }
 }