Update Jackson config and refactor JSON handling

Introduced Jackson dependencies to replace Gson for JSON processing. Updated application properties and controllers to handle Jackson-specific exceptions. Refactored form serialization to use Jackson's `ObjectMapper` for better date handling and consistency.

src/main/java/com/alttd/forms/form/Form.java

@@ -1,11 +1,15 @@
 package com.alttd.forms.form;
 
-import com.google.gson.Gson;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 
 public abstract class Form {
 
-    public String toJsonString() {
-        return new Gson().toJson(this);
+    public String toJsonString() throws JsonProcessingException {
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.registerModule(new JavaTimeModule());
+        return objectMapper.writeValueAsString(this);
     }
 
     public abstract String toHtml();

src/main/java/com/alttd/forms/form/StoreFormQuery.java

@@ -8,6 +8,7 @@ import java.util.Optional;
 import java.util.Random;
 import java.util.concurrent.CompletableFuture;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -41,6 +42,9 @@ public class StoreFormQuery {
         } catch (SQLException e) {
             logger.error("Failed insert form query for: " + form, e);
             return Optional.empty();
+        } catch (JsonProcessingException e) {
+            logger.error("Invalid class for JSON, failed insert form query for: " + form, e);
+            return Optional.empty();
         }
     }
 

src/main/java/com/alttd/forms/verify_mail/FormQuery.java

@@ -3,7 +3,9 @@ package com.alttd.forms.verify_mail;
 import com.alttd.forms.contact.ContactFormData;
 import com.alttd.forms.database.DatabaseConnection;
 import com.alttd.forms.form.Form;
-import com.google.gson.Gson;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -53,6 +55,9 @@ public class FormQuery {
             } catch (IllegalArgumentException e) {
                 logger.error("Invalid form class in database", e);
                 return Optional.empty();
+            } catch (JsonProcessingException e) {
+                logger.error("Invalid form json in database", e);
+                return Optional.empty();
             }
         } catch (SQLException e) {
             logger.error("Failed select form query for form with id: {}", formId, e);
@@ -60,10 +65,12 @@ public class FormQuery {
         }
     }
 
-    private Form getForm(String className, String json) throws IllegalArgumentException {
+    private Form getForm(String className, String json) throws IllegalArgumentException, JsonProcessingException {
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.registerModule(new JavaTimeModule());
         switch (className) {
             case "ContactFormData" -> {
-                return new Gson().fromJson(json, ContactFormData.class);
+                return objectMapper.readValue(json, ContactFormData.class);
             }
             default -> throw new IllegalArgumentException("Invalid form class name: " + className);
         }

src/main/java/com/alttd/forms/verify_mail/VerifyController.java

@@ -1,6 +1,7 @@
 package com.alttd.forms.verify_mail;
 
 import com.alttd.forms.mail.mail_forms.MailForm;
+import com.fasterxml.jackson.core.JsonProcessingException;
 import jakarta.validation.Valid;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -51,12 +52,20 @@ public class VerifyController {
                     } catch (URISyntaxException e) {
                         logger.error("Unable to create URI for posting form", e); //TODO more clear
                         return ResponseEntity.ok("Unable to create URI for posting form, please contact us at [email protected]");
+                    } catch (JsonProcessingException e) {
+                        logger.error("Unable to send form to Discord, invalid JSON", e);
+                        return ResponseEntity.ok("Unable to send form to Discord, please contact us at [email protected]");
                     } catch (IOException | InterruptedException e) {
                         logger.error("Unable to send form to Discord", e); //TODO more clear
                         return ResponseEntity.ok("Unable to send form to Discord, please contact us at [email protected]");
                     }
                     MailForm.sendForm("[email protected]", form);
-                    return ResponseEntity.ok(form.toJsonString());
+                    try {
+                        return ResponseEntity.ok(form.toJsonString());
+                    } catch (JsonProcessingException e) {
+                        logger.error("Unable to send form to Discord, invalid JSON", e);
+                        return ResponseEntity.ok("Unable to send form to Discord, please contact us at [email protected]");
+                    }
                 })
                 .orElse(ResponseEntity.ok(result.failReason()))
         ).exceptionally(throwable -> ResponseEntity.internalServerError()

src/main/resources/application.properties

@@ -1,3 +1,4 @@
 logging.level.com.alttd.forms=warn
 server.port=8002
-spring.jackson.date-format=yyyy-MM-dd
+spring.jackson.date-format=yyyy-MM-dd
+spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS=false