How do I access Cassandra from a Spring boot application?-CodePudding

I am new to using Spring Boot Applications. I would like to know how to connect cassandra database to the application. I added this dependency in the pom.xml file :

<dependency>
    <groupId>com.datastax.oss</groupId>
    <artifactId>java-driver-core</artifactId>
    <version>4.1.0</version>
</dependency>

And these lines to the application.yml file :

spring:
  data:
    cassandra:
      keyspace-name: test-keyspace
      contact-points: localhost
      port: 9042
      schemaAction: CREATE_IF_NOT_EXISTS
      request:
        timeout: 10s
      connection:
        connect-timeout: 10s
      locaDatacenter: datacenter1

However, when I run the application, I get such errors :

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: 

Error creating bean with name'org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration':
Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: 


Error creating bean with name 'cassandraSession' defined in class path resource [org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.class]: 
Unsatisfied dependency expressed through method 'cassandraSession' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: 


Error creating bean with name 'cassandraSessionBuilder' defined in class path resource [org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.class]: 
Unsatisfied dependency expressed through method 'cassandraSessionBuilder' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: 


Error creating bean with name 'cassandraDriverConfigLoader' defined in class path resource [org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.class]: 
Bean instantiation via factory method failed; 
nested exception is org.springframework.beans.BeanInstantiationException: 


Failed to instantiate [com.datastax.oss.driver.api.core.config.DriverConfigLoader]: Factory method 'cassandraDriverConfigLoader' threw exception; nested exception is java.lang.NoSuchFieldError: CONNECTION_CONNECT_TIMEOUT

CodePudding user response：

Instead of the DataStax Java driver, try Spring Boot's dependency for Spring Data (which pulls in the DataStax driver itself):

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-cassandra</artifactId>
</dependency>

CodePudding user response：

In addition to Aaron's answer, there's a good chance that there's a version conflict in your deployment that's leading to the exceptions you posted.

It isn't necessary to specify the Cassandra Java driver as a dependency because Spring Boot will pull all the required dependencies correct versions automatically for you.

Since you're new, I would recommend that you start with a working example instead of doing one on your own. The Spring project has a repository on GitHub with Spring Data examples including one specific for Cassandra.

Additionally, DataStaxDevs recently ran an interactive workshop that shows you how to build a microservices app with Spring Data Cassandra and Spring Boot. Details of the workshop and the hands-on tutorials with full working code are available here -- https://github.com/DataStaxDevs/workshop-spring-data-cassandra. Cheers!