#55 added conference model without user's participation and deposit. May be needed new user model.

src/main/java/ru/ulstu/conference/model/Conference.java

@@ -1,11 +1,60 @@
 package ru.ulstu.conference.model;
 
+import org.hibernate.annotations.Fetch;
+import org.hibernate.annotations.FetchMode;
+import org.hibernate.validator.constraints.NotBlank;
 import ru.ulstu.core.model.BaseEntity;
+import ru.ulstu.deadline.model.Deadline;
+import ru.ulstu.paper.model.Paper;
+import ru.ulstu.user.model.User;
 
+import javax.persistence.CascadeType;
+import javax.persistence.Column;
 import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToMany;
+import javax.persistence.OneToMany;
+import javax.persistence.OrderBy;
 import javax.persistence.Table;
+import javax.persistence.Temporal;
+import javax.persistence.TemporalType;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 
 @Entity
 @Table(name = "conference")
 public class Conference extends BaseEntity {
+
+    @NotBlank
+    private String title;
+
+    private String description;
+
+    private String url;
+
+    private int ping;
+
+    @Column(name = "begin_date")
+    @Temporal(TemporalType.TIMESTAMP)
+    private Date beginDate = new Date();
+
+    @Column(name = "end_date")
+    @Temporal(TemporalType.TIMESTAMP)
+    private Date endDate = new Date();
+
+    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
+    @JoinColumn(name = "conference_id", unique = true)
+    @Fetch(FetchMode.SUBSELECT)
+    @OrderBy("date")
+    private List<Deadline> deadlines = new ArrayList<>();
+
+    @ManyToMany(fetch = FetchType.EAGER)
+    private Set<Paper> papers = new HashSet<>();
+
+    @ManyToMany(fetch = FetchType.EAGER)
+    private Set<User> users = new HashSet<>();
 }