How to Generate Dynamic Content using Mustache Templates?

import java.time.Duration;
import java.util.Date;
import java.util.function.Function;

public class TodoItems {

    public TodoItems() {
    }

    public TodoItems(String title, String text) {
        this.itemTitle = title;
        this.itemText = text;
        createdDate = new Date();
    }

    private String itemTitle;
    private String itemText;
    private boolean done = false;

    private Date createdDate;
    private Date completedDate;

    public void markAsDone() {
        done = true;
        completedDate = new Date();
    }

    public String getTitle() {
        return itemTitle;
    }

    public void setTitle(String title) {
        this.itemTitle = title;
    }

    public String getText() {
        return itemText;
    }

    public void setText(String text) {
        this.itemText = text;
    }

    public boolean getDone() {
        return done;
    }

    public Date getCreatedOn() {
        return createdDate;
    }

    public Date getCompletedOn() {
        return completedDate;
    }

    public void setDone(boolean done) {
        this.done = done;
    }

    public void setCompletedOn(Date completedOn) {
        this.completedDate = completedOn;
    }

    public long doneSince() {
        return done ? Duration
          .between(createdDate.toInstant(), completedDate.toInstant())
          .toMinutes() : 0;
    }

    public Function<Object, Object> handleDone() {
        return (obj) -> done ? String.format("<small>Done %s minutes ago<small>", obj) : "";

    }

}

import com.github.mustachejava.DefaultMustacheFactory;
import com.github.mustachejava.MustacheFactory;

public class MustacheUtil {

    private static final MustacheFactory mf = new DefaultMustacheFactory();
    
    public static MustacheFactory getMustacheFactory(){
        return mf;
    }    
    
}

import com.samskivert.mustache.DefaultCollector;
import com.samskivert.mustache.Mustache;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages = {"com.gfg"})
public class SpringMustacheApplication {

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

    @Bean
    public Mustache.Compiler mustacheCompiler(Mustache.TemplateLoader templateLoader) {
        return Mustache.compiler()
          // Here if the value is not provided 
          // then defaultValue will be taken
          .defaultValue("Some Author")
          .withLoader(templateLoader)
          .withCollector(new DefaultCollector());
    }
}

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

import org.fluttercode.datafactory.impl.DataFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.ModelAndView;

import com.gfg.springmustache.model.GeekArticle;

@Controller
public class GeekArticleController {

    @GetMapping("/article")
    public ModelAndView displayArticle(Map<String, Object> model) {

        List<GeekArticle> geekArticles = IntStream.range(0, 10)
          .mapToObj(i -> generateArticle("Article Title " + i))
          .collect(Collectors.toList());

        model.put("articles", geekArticles);

        return new ModelAndView("index", model);
    }

    private GeekArticle generateArticle(String title) {
        GeekArticle geekArticle = new GeekArticle();
        DataFactory factory = new DataFactory();
        geekArticle.setTitle(title);
        geekArticle.setBody(
          "A data structure is not only used for organizing the data. It is also used for processing, retrieving, and storing data. There are different basic and advanced types of data structures that are used in almost every program or software system that has been developed. So we must have good knowledge about data structures.");
        geekArticle.setPublishDate(factory.getBirthDate().toString());
        //article.setAuthor(factory.getName());
        return geekArticle;
    }
}

public class GeekArticle {
  
    private String geekTitle;
    private String geekBody;
    private String geekAuthorName;
    private String publishDate;

    public String getTitle() {
        return geekTitle;
    }

    public void setTitle(String title) {
        this.geekTitle = title;
    }

    public String getBody() {
        return geekBody;
    }

    public void setBody(String body) {
        this.geekBody = body;
    }

    public String getAuthor() {
        return geekAuthorName;
    }

    public void setAuthor(String author) {
        this.geekAuthorName = author;
    }

    public String getPublishDate() {
        return publishDate;
    }

    public void setPublishDate(String publishDate) {
        this.publishDate = publishDate;
    }

}