Error handling

src/main/java/dtos/error/ErrorDetail.java

 package dtos.error;
 
+import java.util.List;
+import java.util.Map;
+
 public class ErrorDetail {
 
     private String title;
     private String detail;
     private long timeStamp;
     private String developerMessage;
+    private Map<String, List<ValidationError>> errors;
 
     public String getTitle() {
         return title;
         this.developerMessage = developerMessage;
     }
 
+    public Map<String, List<ValidationError>> getErrors() {
+        return errors;
+    }
+
+    public void setErrors(Map<String, List<ValidationError>> errors) {
+        this.errors = errors;
+    }
+
 }

src/main/java/dtos/error/ValidationError.java

+package dtos.error;
+
+public class ValidationError {
+
+    private String code;
+    private String message;
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+}

src/main/java/io/zipcoder/tc_spring_poll_application/controller/PollController.java

 import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
 
 import javax.inject.Inject;
+import javax.validation.Valid;
 import java.net.URI;
 
 @RestController
     }
 
     @RequestMapping(value="/polls", method=RequestMethod.POST)
-    public ResponseEntity<?> createPoll(@RequestBody Poll poll) {
+    public ResponseEntity<?> createPoll(@Valid @RequestBody Poll poll) {
         poll = pollRepository.save(poll);
         URI newPollUri = ServletUriComponentsBuilder
                 .fromCurrentRequest()
     }
 
     @RequestMapping(value="/polls/{pollId}", method=RequestMethod.PUT)
-    public ResponseEntity<?> updatePoll(@RequestBody Poll poll, @PathVariable Long pollId) {
+    public ResponseEntity<?> updatePoll(@Valid @RequestBody Poll poll, @PathVariable Long pollId) {
         verifyPoll(pollId);
         Poll p = pollRepository.save(poll);
         return new ResponseEntity<>(HttpStatus.OK);

src/main/java/io/zipcoder/tc_spring_poll_application/domain/Poll.java

 package io.zipcoder.tc_spring_poll_application.domain;
 
+import org.hibernate.validator.constraints.NotEmpty;
+
 import javax.persistence.*;
+import javax.validation.constraints.Size;
 import java.util.Set;
 
 @Entity
     @Column(name = "POLL_ID")
     private Long id;
 
+    @NotEmpty
     @Column(name = "QUESTION")
     private String question;
 
     @OneToMany(cascade = CascadeType.ALL)
     @JoinColumn(name = "POLL_ID")
     @OrderBy
+    @Size(min=2, max = 6)
     private Set<Option> options;
 
     public Long getId() {

src/main/java/io/zipcoder/tc_spring_poll_application/exception/RestExceptionHandler.java

 
 @ControllerAdvice
 public class RestExceptionHandler {
+
     @ExceptionHandler(ResourceNotFoundException.class)
     public ResponseEntity<?> handleResourceNotFoundException(ResourceNotFoundException rnfe, HttpServletRequest request) {
         ErrorDetail errorDetail = new ErrorDetail();
         errorDetail.setDeveloperMessage(rnfe.getClass().getName());
         return new ResponseEntity<>(errorDetail, null, HttpStatus.NOT_FOUND);
     }
+
 }