started with erd implementation

Natlab/src/main/java/fu/berlin/swp/datenverwaltung2020/natlab/Natlab/entity/Course.java

+package fu.berlin.swp.datenverwaltung2020.natlab.Natlab.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.time.LocalDate;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "course")
+public class Course {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "course_id")
+    private String id;
+
+    @Column(name = "course_number")
+    private String courseNumber;
+
+    @Column(name = "course_name")
+    private String name;
+
+    @Column(name = "course_topic")
+    private String topic;
+
+    @Column(name = "present_students")
+    private int presentStudents;
+
+    @Column(name = "registeredS_students")
+    private int registeredStudents;
+
+    @Column(name = "event_type")
+    private String eventType;
+
+    @Column(name = "group_name")
+    private String groupName;
+
+    @Column(name = "course_start")
+    private LocalDate courseStart;
+
+    @ManyToMany
+    @JoinTable(name = "users_courses",
+            joinColumns = @JoinColumn(name = "course_id"),
+            inverseJoinColumns = @JoinColumn(name = "users_id"))
+    private List<User> users;
+
+}

Natlab/src/main/java/fu/berlin/swp/datenverwaltung2020/natlab/Natlab/entity/User.java

+package fu.berlin.swp.datenverwaltung2020.natlab.Natlab.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "users")
+public class User {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "users_id")
+    private int id;
+
+    @Column(name = "first_name")
+    private String firstName;
+
+    @Column(name = "last_name")
+    private String lastName;
+
+    @Column(name = "email")
+    private String email;
+
+    @Column(name = "password")
+    private String password;
+
+    @ManyToMany(mappedBy = "users")
+    private List<Course> courses;
+
+}

Natlab/src/main/resources/application.properties

@@ -4,9 +4,9 @@ spring.datasource.driver-class-name=org.postgresql.Driver
 spring.datasource.username=postgres
 spring.datasource.password=
 
-# The SQL dialect makes Hibernate generate better SQL for the chosen database
-spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
+spring.jpa.database-platform=org.hibernate.dialect.PostgreSQL9Dialect
+
+spring.jpa.hibernate.ddl-auto=update
 
-# Hibernate ddl auto (create, create-drop, validate, update)
-spring.jpa.hibernate.ddl-auto = update