Remove implements Serializable from DTOs

src/main/java/cz/muni/ics/kypo/training/adaptive/dto/AbstractPhaseDTO.java

@@ -2,9 +2,7 @@ package cz.muni.ics.kypo.training.adaptive.dto;
 
 import cz.muni.ics.kypo.training.adaptive.enums.PhaseType;
 
-import java.io.Serializable;
-
-public abstract class AbstractPhaseDTO implements Serializable {
+public abstract class AbstractPhaseDTO {
 
     private Long id;
     private String title;

src/main/java/cz/muni/ics/kypo/training/adaptive/dto/AbstractQuestionDTO.java

@@ -5,10 +5,9 @@ import io.swagger.annotations.ApiModelProperty;
 
 import javax.validation.constraints.NotEmpty;
 import javax.validation.constraints.NotNull;
-import java.io.Serializable;
 import java.util.List;
 
-public abstract class AbstractQuestionDTO implements Serializable {
+public abstract class AbstractQuestionDTO {
 
     @ApiModelProperty(value = "Order of question", required = true, example = "0")
     @NotNull(message = "Question order must be specified")

src/main/java/cz/muni/ics/kypo/training/adaptive/dto/InfoPhaseDTO.java

 package cz.muni.ics.kypo.training.adaptive.dto;
 
-import java.io.Serializable;
-
-public class InfoPhaseDTO extends AbstractPhaseDTO implements Serializable {
+public class InfoPhaseDTO extends AbstractPhaseDTO {
 
     private String content;
 

src/main/java/cz/muni/ics/kypo/training/adaptive/dto/QuestionChoiceDTO.java

@@ -4,9 +4,8 @@ import io.swagger.annotations.ApiModelProperty;
 
 import javax.validation.constraints.NotEmpty;
 import javax.validation.constraints.NotNull;
-import java.io.Serializable;
 
-public class QuestionChoiceDTO implements Serializable {
+public class QuestionChoiceDTO {
 
     @ApiModelProperty(value = "Question choice ID. Leave blank if new choice is added", required = true, example = "1")
     private Long id;

src/main/java/cz/muni/ics/kypo/training/adaptive/dto/QuestionDTO.java

@@ -2,9 +2,7 @@ package cz.muni.ics.kypo.training.adaptive.dto;
 
 import io.swagger.annotations.ApiModelProperty;
 
-import java.io.Serializable;
-
-public class QuestionDTO extends AbstractQuestionDTO implements Serializable {
+public class QuestionDTO extends AbstractQuestionDTO {
 
     @ApiModelProperty(value = "Question ID. Leave blank if a new question is added", required = true, example = "1")
     private Long id;

src/main/java/cz/muni/ics/kypo/training/adaptive/dto/TaskDTO.java

 package cz.muni.ics.kypo.training.adaptive.dto;
 
-import java.io.Serializable;
-
-public class TaskDTO implements Serializable {
+public class TaskDTO {
 
     private Long id;
     private String title;