DemoApplication.java

package com.example.demo;

import java.time.Instant;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.joda.time.DateTime;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.cassandra.core.CassandraTemplate;
import org.springframework.data.cassandra.core.convert.CassandraCustomConversions;

@SpringBootApplication
public class DemoApplication {

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

	@Bean
	CassandraCustomConversions cassandraCustomConversions() {
		List<Converter> converters = new ArrayList<>();
		converters.add(new InstantToDateTimeConverter());
		converters.add(new DateTimeToInstantConverter());
		CassandraCustomConversions ccv = new CassandraCustomConversions(converters);
		return ccv;
	}

	class DateTimeToInstantConverter implements Converter<DateTime, java.time.Instant> {
		@Override
		public java.time.Instant convert(DateTime source) {
			return source.toDate().toInstant();
		}
	}

	class InstantToDateTimeConverter implements Converter<Instant, DateTime> {
		@Override
		public DateTime convert(java.time.Instant source) {
			return new DateTime(Date.from(source));
		}
	}

	@Bean
	CommandLineRunner runner(CassandraTemplate cassandraTemplate){

		return args -> {

			List<MyEntity> select = cassandraTemplate.select("SELECT * FROM myentity", MyEntity.class);
			System.out.println(select);
		};
	}



}

MyEntity.java

package com.example.demo;

import org.joda.time.DateTime;

import org.springframework.data.annotation.Id;

/**
 * create table myentity (id varchar PRIMARY KEY, ts timestamp);
 */
public class MyEntity {

	@Id String id;

	DateTime ts;

	public String getId() {
		return id;
	}

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

	public DateTime getTs() {
		return ts;
	}

	public void setTs(DateTime ts) {
		this.ts = ts;
	}
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>3.2.2</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.sample</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo</name>
	<description>demo</description>
	<properties>
		<java.version>17</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-cassandra</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>joda-time</groupId>
			<artifactId>joda-time</artifactId>
			<version>2.12.7</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>