implement API Json error and generator

src/main/java/wtf/beatrice/releasehive/model/ApiError.java

@@ -0,0 +1,33 @@
+package wtf.beatrice.releasehive.model;
+
+import jakarta.persistence.Entity;
+
+import java.util.UUID;
+
+@Entity
+public class ApiError
+{
+    UUID exceptionId;
+
+    String message;
+
+    public ApiError() {
+        exceptionId = UUID.randomUUID();
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public UUID getExceptionId() {
+        return exceptionId;
+    }
+
+    public void setExceptionId(UUID exceptionId) {
+        this.exceptionId = exceptionId;
+    }
+}

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

@@ -6,8 +6,8 @@ import wtf.beatrice.releasehive.util.JsonUtil;
 import wtf.beatrice.releasehive.model.User;
 import wtf.beatrice.releasehive.service.AccountService;
 
-@RequestMapping("/api/v1/users")
 @RestController
+@RequestMapping("/api/v1/users")
 public class AccountResource {
 
     private final AccountService accountService;
@@ -22,7 +22,6 @@ public class AccountResource {
             produces="application/json")
     public String register(@RequestBody User user)
     {
-        accountService.registerUser(user);
-        return JsonUtil.convertToJson(user);
+        return accountService.registerUser(user);
     }
 }

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

@@ -5,5 +5,5 @@ import wtf.beatrice.releasehive.model.User;
 public interface AccountService
 {
 
-    void registerUser(User user);
+    String registerUser(User user);
 }

src/main/java/wtf/beatrice/releasehive/service/AccountServiceImpl.java

@@ -5,15 +5,28 @@ import org.hibernate.Transaction;
 import org.springframework.stereotype.Service;
 import wtf.beatrice.releasehive.db.HibernateManager;
 import wtf.beatrice.releasehive.model.User;
+import wtf.beatrice.releasehive.util.JsonUtil;
 
 @Service
 public class AccountServiceImpl implements AccountService {
 
     @Override
-    public void registerUser(User user) {
+    public String registerUser(User user) {
+
+        if(null == user.getUsername() || user.getUsername().isEmpty()) {
+            return JsonUtil.spawnJsonError("Cannot register user without username");
+        }
+
+
+        if(null == user.getPassword() || user.getPassword().isEmpty()) {
+            return JsonUtil.spawnJsonError("Cannot register user without password");
+        }
+
         Session session = HibernateManager.getSession();
         Transaction transaction = session.beginTransaction();
-        session.save(user);
+        session.persist(user);
         transaction.commit();
+
+        return JsonUtil.convertToJson(user);
     }
 }

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

@@ -4,6 +4,7 @@ import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import wtf.beatrice.releasehive.model.ApiError;
 
 public class JsonUtil
 {
@@ -23,4 +24,12 @@ public class JsonUtil
             return e.getMessage();
         }
     }
+
+    public static String spawnJsonError(String errorMessage) {
+        ApiError apiError = new ApiError();
+        apiError.setMessage(errorMessage);
+        String error = convertToJson(apiError);
+        LOGGER.error(error);
+        return error;
+    }
 }