Unable to get SchemaAction.CREATE to work - spring-data-cassandra

Question

My Spring Data Cassandra configuration looks like this:
#Configuration
#EnableCassandraRepositories(basePackages = {
"mypackage.repository.cassandra",
})
public class DistributedRepositoryConfiguration {
// ...
#Bean
public CassandraSessionFactoryBean session() throws Exception {
CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
session.setCluster(cluster().getObject());
session.setKeyspaceName(configuration.get().getKeyspace());
session.setConverter(converter());
session.setSchemaAction(SchemaAction.CREATE);
return session;
}
}
Generally, Spring Data Cassandra works in my project. However, when I start my application I have no tables created. Anyone who could tell me what I'm doing wrong?

Answer 1

It is not written well in documentation if you want to have automatic table creation you should tell cassandra where to look for entity classes:
<cassandra:mapping entity-base-packages="your.package" />
If you want to do the same using annotiation configuration you have to explicitly tell CassandraTemplate where to look for it. So
#Bean
public CassandraSessionFactoryBean session() throws Exception {
CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
session.setCluster(cluster().getObject());
session.setKeyspaceName(keyspaceName);
session.setConverter(converter());
session.setSchemaAction(SchemaAction.CREATE);
return session;
}
#Bean
public CassandraConverter converter() throws Exception {
return new MappingCassandraConverter(mappingContext());
}
#Bean
public CassandraMappingContext mappingContext() throws Exception {
BasicCassandraMappingContext bean = new BasicCassandraMappingContext();
bean.setInitialEntitySet(CassandraEntityClassScanner.scan(("package.with.your.entities")));
return bean;
}
To do it with ease I suggest using AbstractCassandraConfiguration and override methods which You need.

Answer 2

I checked the class AbstractCassandraConfiguration and found the following code:
public String[] getEntityBasePackages() {
return new String[] { getClass().getPackage().getName() };
}
Since my config class isn't in the main package, the component scan does not find my classes with the #Table annotation. So I override the method "getEntityBasePackages()" using my StartUp class and everything worked fine.
This is my config class:
#Configuration
public class CassandraConfig extends AbstractCassandraConfiguration {
#Value("${spring.data.cassandra.keyspace-name}")
private String keyspaceName;
#Override
protected String getKeyspaceName() {
return keyspaceName;
}
#Override
public String[] getEntityBasePackages() {
return new String[]{AppStartup.class.getPackage().getName()};
}
#Override
protected List<CreateKeyspaceSpecification> getKeyspaceCreations() {
return Collections.singletonList(CreateKeyspaceSpecification
.createKeyspace(keyspaceName)
.ifNotExists(true)
.with(KeyspaceOption.DURABLE_WRITES, true)
.withSimpleReplication());
}
#Override
public SchemaAction getSchemaAction() {
return SchemaAction.CREATE_IF_NOT_EXISTS;
}
}
Using this class, your application should create the required keyspace and tables to run.

Answer 3

If you using CassandraDataConfiguration just annotated you base class application with:
#EntityScan("mypackage.repository.cassandra")
The base package information will be used in CassandraDataAutoConfiguration.cassandraMapping method to add this package to cassandra mapping.