Hibernate joining two table and fetch all records?

Question

I have two entity class Category and Events.I need to join both the tables and fetch all records which matching the given condition

Answer 1

Hibernate is about mapping objects and the relations, however you are mapping simple id fields.

In your Events class you have the followingL

@Entity
@Table(name = "events")
public class Events implements Serializable { 

    @Column(name = "category_i")
    private Integer categoryI;

}

However it should be a Category instead of an Integer.

@Entity
@Table(name = "events")
public class Events implements Serializable { 

    @ManyToOne
    @Column(name = "category_i")
    private Category category;

}

Then in your Category you should add the mappedBy field to the @ManyToOne on the events field and remove the @JoinColumn.

@Entity
@Table(name = "category")
public class Category implements Serializable {

    @OneToMany(mappedBy="category")
    private Events events;
}

The same applies to the parentCategoryId of the Category class.

Now that you have your mapping corrected you should be able to write the query as you wanted to.