implement JSON API handling

pom.xml

@@ -24,6 +24,11 @@
             <artifactId>spring-boot-starter-web</artifactId>
             <version>3.3.2</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-json</artifactId>
+            <version>3.3.2</version>
+        </dependency>
 
         <dependency>
             <groupId>org.hibernate</groupId>

src/main/java/wtf/beatrice/releasehive/AccountController.java

@@ -1,29 +0,0 @@
-package wtf.beatrice.releasehive;
-
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.RestController;
-
-import java.util.UUID;
-
-@RestController
-public class AccountController {
-
-    private final AccountService accountService = new AccountService();
-
-
-    @PostMapping("/register")
-    public String register(
-            @RequestParam(name = "username") String username,
-            @RequestParam(name="password") String password)
-    {
-
-        UUID id = UUID.randomUUID();
-        User user = new User();
-        user.setUsername(username);
-        user.setPassword(password);
-        user.setUuid(id);
-        accountService.registerUser(user);
-        return "user registered, " + username + ", " + password + ", " + id.toString();
-    }
-}

src/main/java/wtf/beatrice/releasehive/AccountResource.java

@@ -0,0 +1,27 @@
+package wtf.beatrice.releasehive;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.UUID;
+
+@RequestMapping("/api/v1/users")
+@RestController
+public class AccountResource {
+
+    private final AccountService accountService = new AccountService();
+
+
+    @PostMapping(
+            value="/register",
+            produces="application/json")
+    public String register(@RequestBody User user)
+    {
+        UUID id = UUID.randomUUID();
+        user.setUuid(id);
+        accountService.registerUser(user);
+
+        return JsonUtil.convertToJson(user);
+    }
+}

src/main/java/wtf/beatrice/releasehive/AccountService.java

@@ -8,8 +8,8 @@ public class AccountService
 
     public void registerUser(User user) {
         Session session = HibernateManager.getSession();
-        Transaction tx = session.beginTransaction();
+        Transaction transaction = session.beginTransaction();
         session.save(user);
-        tx.commit();
+        transaction.commit();
     }
 }

src/main/java/wtf/beatrice/releasehive/JsonUtil.java

@@ -0,0 +1,21 @@
+package wtf.beatrice.releasehive;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class JsonUtil
+{
+    private static final Logger LOGGER = LogManager.getLogger(JsonUtil.class);
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    public static String convertToJson(Object input) {
+        try {
+            return MAPPER.writeValueAsString(input);
+        } catch (JsonProcessingException e) {
+            LOGGER.error(e);
+            return e.getMessage();
+        }
+    }
+}