Added model in webapp.

src/main/webapp/src/app/model/group.ts

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+import {GroupLeader} from "./groupLeader";
+import {GroupMember} from "./groupMember";
+
+export class Group {
+  id: number | null;
+  groupLeaders: GroupLeader[];
+  groupMembers: GroupMember[];
+
+  constructor(id: number | null, groupLeaders: GroupLeader[], groupMembers: GroupMember[]) {
+    this.id = id;
+    this.groupLeaders = groupLeaders;
+    this.groupMembers = groupMembers;
+  }
+}

src/main/webapp/src/app/model/groupLeader.ts

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+export class GroupLeader {
+  id: number;
+  personId: number;
+  groupId: number;
+
+  constructor(id: number, personId: number, groupId: number) {
+    this.id = id;
+    this.personId = personId;
+    this.groupId = groupId;
+  }
+}

src/main/webapp/src/app/model/groupMember.ts

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+export class GroupMember {
+  id: number;
+  studentId: number;
+  groupId: number;
+
+  constructor(id: number, studentId: number, groupId: number) {
+    this.id = id;
+    this.studentId = studentId;
+    this.groupId = groupId;
+  }
+}

src/main/webapp/src/app/model/person.ts

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+import {Student} from "./student";
+
+export class Person {
+  id: number | null;
+  name: string;
+  surname: string;
+
+  student: Student | null;
+
+  constructor(id: number | null, name: string, surname: string, student: Student | null) {
+    this.id = id;
+    this.name = name;
+    this.surname = surname;
+    this.student = student;
+  }
+}

src/main/webapp/src/app/model/student.ts

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+export class Student {
+  id: number | null;
+  personId: number | null;
+  index: string;
+  constructor(id: number | null, personId: number | null, index: string) {
+    this.id = id;
+    this.personId = personId;
+    this.index = index;
+  }
+}