I got error in save() method in spring-boot

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Java

API

JPA

Spring

springboot

I am trying to make a project in spring-boot! But in the controller, I am getting an error in the save() method as follows:

The method save(S) in the type CrudRepository<demoapplication,integer> is not applicable for the arguments (DemoApplication)Java(67108979)
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Here is the main App code:

package com.practice.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
}

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Here is the entity code:

package com.practice.demo.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="practice_with_spring")
public class DemoApplication {
    @Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

	@Column(name = "name")
	private String name;

	@Column(name = "password")
	private int password;
	
	@Column(name = "age")
	private String age;
	
	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getpassword() {
		return password;
	}

	public void setpassword(int password) {
		this.password = password;
	}

	public String getage() {
		return age;
	}

	public void setage(String age) {
		this.age = age;
	}
}

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Here is the Controller code:

package com.practice.demo.controller;

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.practice.demo.DemoApplication;
import com.practice.demo.repository.DemoApplicationRepository;

import org.springframework.beans.factory.annotation.Autowired;

@RestController
@RequestMapping(value="/DemoApplication")
public class DemoApplicationController {
    @Autowired
    private DemoApplicationRepository DemoApplicationRepository;

    @PostMapping("/save")
	DemoApplicationController createOrSaveEmployee(@RequestBody DemoApplication DemoApplication) {
	
        return DemoApplicationRepository.save(  DemoApplication);
	}
}

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Here is the Repository code:

package com.practice.demo.repository;

import com.practice.demo.entity.DemoApplication;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface DemoApplicationRepository extends JpaRepository<demoapplication,integer>{
    
}

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This is the line which gives me an Error:

return DemoApplicationRepository.save( DemoApplication);

What I have tried:

I tried to solve this problem by myself, but I wasted more hours in this error than I expected. Moreover, i am a newbie in spring-boot projects. So can someone please help me!