[JAVA] Cassandra x Spring Boot struggle record

Summary of this article

--Since I have never touched Cassandra, it is a record when I tried to build ~ Spring Boot application to reference / update --The environment is a local PC (Mac)


Cassandra: http://cassandra.apache.org/doc/latest/ SpringDataCassandra: https://spring.io/projects/spring-data-cassandra property Setting item: https://docs.spring.io/spring-boot/docs/current/reference/html/appendix-application-properties.html#data-properties

Building Cassandra


#Cassandra body
brew install cassandra
# CQL(Cassandra Query Language)
brew install cql


cassandra -f

Connection error: ('Unable to connect to any servers', {'': error(61, "Tried connecting to [('', 9042)]. Last error: Connection refused")})

It doesn't move. .. .. In my case, it seems that JAVA_HOME shouldn't point to the Java 11 directory. .. .. After redefining it, it will start up safely!

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_211.jdk/Contents/Home/
cassandra -f

Start with Homebrew anyway!

vi /usr/local/etc/cassandra/cassandra-env.sh
#"Export JAVA" at the end_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_211.jdk/Contents/Home/Added

brew services start cassandra



cqlsh localhost 9042 With this

Let's play Cassandra alone for a moment


Resume from here The explanation of detailed options is omitted here. .. ..

Add KeySpace

Concept corresponding to Database in MySQL and Oracle

-- #Before adding keyspace
DESCRIBE keyspaces
-- system_traces  system_schema  system_auth  system  system_distributed

-- #Added "sample" keyspace
CREATE KEYSPACE sample WITH REPLICATION = {'class':'SimpleStrategy','replication_factor':1};

-- #Before adding keyspace
DESCRIBE keyspaces
-- system_schema  system_auth  system  sample  system_distributed  system_traces

By the way, the deletion is


Move Database

USE sample

Creating a table

Here, we simply assume data with Key and Value.

CREATE TABLE t_sample (key text PRIMARY KEY, value text);

--Check the list
DESCRIBE tables;

--Check table definition
DESCRIBE table t_sample;

By the way, the deletion is

DROP TABLE t_sample;

Data manipulation

Using the t_sample table created earlier

--Reference (empty)
select * from t_sample;

--Reference (equivalent to above)
select key, value from t_sample;

INSERT INTO t_sample (key, value) VALUES ('key1', 'value1');

--Registration (duplicate)
--The query is successful and behaves like an update
INSERT INTO t_sample (key, value) VALUES ('key1', 'value2');

UPDATE t_sample SET value = 'value3' WHERE key = 'key1';

DELETE FROM t_sample WHERE key = 'key1';

It's my first experience to be updated instead of being played if I violate the primary

Build Spring application

project creation


plugins {
    id 'org.springframework.boot' version '2.2.4.RELEASE'
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'java'

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

repositories {

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-cassandra'
    //webflux is for operation check
    implementation 'org.springframework.boot:spring-boot-starter-webflux'


      keyspace-name: sample

Create model class for table


import lombok.Value;
import org.springframework.data.cassandra.core.mapping.PrimaryKey;
import org.springframework.data.cassandra.core.mapping.Table;

public class Sample {
    private String key;
    private String value;

Try to register / reference / delete


public class Application {
    public static void main(String[] args) {

        Cluster cluster = Cluster.builder()
                .withoutJMXReporting()  //Error if not attached
        Session session = cluster.connect("sample");

        var template = new CassandraTemplate(session);
        var data = new Sample("key1", "value1");

        //Search all
        var selected = template.select("SELECT * from t_sample", Sample.class);
        log.info("selected: {}", selected);
        data = new Sample("key1", "value2");
        //Conditional search
        selected = template.select(Query.query(Criteria.where("key").is("key1")), Sample.class);
        log.info("selected: {}", selected);
        //Delete (PK specified)
        template.deleteById("key1", Sample.class);
        //Get the number
        var count = template.count(Sample.class);
        log.info("count: {}", count);

        //Connection closed

The following error occurred unless .withoutJMXReporting () was described.

Exception in thread "main" java.lang.NoClassDefFoundError: com/codahale/metrics/JmxReporter

Try to make it look like a web application

First of all, investigate how much "spring-boot-starter-data-cassandra" will register beans


--ʻOrg.springframework.boot.autoconfigure.cassandra.CassandraAutoConfigurationis registered as a bean --It seems good to set properties underspring.data.cassandra --spring.data.cassandra.keyspace-name = sample`


――Is it Session or Session Factory? --ʻOrg.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfigurationis registered as a bean --This also seems to reflect the settings underspring.data.cassandra`


--Similar to Session, ʻorg.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration` is registered as a bean.

Conclusion ... Suddenly use Cassandra Template and it's OK!


public class CassandraController {
    private final CassandraTemplate template;

    // curl localhost:8080
    public List<Sample> all() {
        return template.select("SELECT * FROM t_sample", Sample.class);

    // curl localhost:8080/key1
    public Sample getByKey(@PathVariable String key) {
        return template.selectOneById(key, Sample.class);

    // curl localhost:8080/insert -d '{"key":"key1","value":"value1"}' -X PATCH -H 'Content-Type: application/json'
    public Sample patch(@RequestBody Sample sample) {
        return template.insert(sample);

    // curl localhost:8080/key1 -X DELETE
    public Boolean delete(@PathVariable String key) {
        return template.deleteById(key, Sample.class);

Reactive support

Just use ReactiveCassandraTemplate! Don't forget to change the return type to Flux or Mono! (It is also OK as a publisher at once)


public class ReactiveCassandraController {
    private final ReactiveCassandraTemplate template;

    // curl localhost:8080/reactive
    public Flux<Sample> all() {
        return template.select("SELECT * FROM t_sample", Sample.class);

    // curl localhost:8080/reactive/key1
    public Mono<Sample> getByKey(@PathVariable String key) {
        return template.selectOneById(key, Sample.class);

    // curl localhost:8080/reactive/insert -d '{"key":"key1","value":"value1"}' -X PATCH -H 'Content-Type: application/json'
    public Mono<Sample> patch(@RequestBody Sample sample) {
        return template.insert(sample);

    // curl localhost:8080/reactive/key1 -X DELETE
    public Mono<Boolean> delete(@PathVariable String key) {
        return template.deleteById(key, Sample.class);


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