fixed notnull, cors

src/main/java/edu/uchicago/mpcs/topics/Application.java

@@ -58,7 +58,9 @@ public class Application {
         return new WebMvcConfigurer() {
             @Override
             public void addCorsMappings(CorsRegistry registry) {
-                registry.addMapping("/**").allowedOrigins("http://localhost:3000");
+                registry.addMapping("/**")
+                        .allowedOrigins("http://localhost:3000")
+                        .allowedMethods("GET", "POST","PUT", "DELETE");
             }
         };
     }

src/main/java/edu/uchicago/mpcs/topics/auction/Bid.java

@@ -4,7 +4,7 @@ import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
-import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
 import java.util.Date;
 
 @Entity
@@ -14,7 +14,7 @@ public class Bid
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long bidId;
 
-    @NotBlank
+    @NotNull
     private Long userId;
     private Long amount;
     private String itemId;

src/main/java/edu/uchicago/mpcs/topics/controller/UserController.java

 package edu.uchicago.mpcs.topics.controller;
 
-import edu.uchicago.mpcs.topics.auction.Item;
-import edu.uchicago.mpcs.topics.service.ItemService;
 import edu.uchicago.mpcs.topics.service.UserService;
 import edu.uchicago.mpcs.topics.user.User;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -14,7 +12,7 @@ import java.util.List;
  */
 
 @RestController
-@RequestMapping("/item")
+@RequestMapping("/user")
 public class UserController {
 
     @Autowired