Spring-data-cassandra：创建名为"sessionFactory"的 bean 时出错，并且无法解析对 bean 'cassandraTemplate' 的引用

Question

我有一个springboot应用程序，我在其中连接到cassandra DB。

我的绒球.xml：

parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-cassandra</artifactId>
</dependency>

cassandraConfig 定义：

@Configuration
@PropertySource("file:///Users/s1b03vf/Work/carrierhub/cass.properties")
@ConfigurationProperties()
@EnableCassandraRepositories(basePackageClasses = {MCSEDistributorRepository.class})
public class MSCECassandraConfig {
protected String contactPoints;
protected int port;
protected String username;
protected String password;
protected String keyspace;

@Override
protected AuthProvider getAuthProvider() {
return new PlainTextAuthProvider(username, password);
}

@Override
protected String getKeyspaceName() {
return keyspace;
}

@Override
protected String getContactPoints() {
return contactPoints;
}

@Override
protected int getPort() {
return port;
}

@Override
public String[] getEntityBasePackages() {
return new String[]{"com.example.demo.entity.cassandra"};
}
}

存储库类：

@Repository
public interface MCSEDistributorRepository extends CassandraRepository<MCSEDistributor, String> {
}

实体类：

@Table("mcse_offer")
public class MCSEDistributor {
@Column
@PrimaryKey
private int id;
@Column
private String name;
}

现在，当我启动应用程序时，我遇到了以下错误：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'documentationPluginsBootstrapper' defined in URL [jar:file:/Users/s1b03vf/.m2/repository/io/springfox/springfox-spring-web/2.9.2/springfox-spring-web-2.9.2.jar!/springfox/documentation/spring/web/plugins/DocumentationPluginsBootstrapper.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'webMvcRequestHandlerProvider' defined in URL [jar:file:/Users/s1b03vf/.m2/repository/io/springfox/springfox-spring-web/2.9.2/springfox-spring-web-2.9.2.jar!/springfox/documentation/spring/web/plugins/WebMvcRequestHandlerProvider.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Unsatisfied dependency expressed through method 'requestMappingHandlerMapping' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MCSEDistributorRepository': Cannot resolve reference to bean 'cassandraTemplate' while setting bean property 'cassandraTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cassandraTemplate' defined in class path resource [com/example/demo/config/MSCECassandraConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.cassandra.core.CassandraAdminTemplate]: Factory method 'cassandraTemplate' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [com/example/demo/config/MSCECassandraConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.cassandra.SessionFactory]: Factory method 'sessionFactory' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'session' defined in class path resource [com/example/demo/config/MSCECassandraConfig.class]: Invocation of init method failed; nested exception is com.datastax.driver.core.exceptions.DriverInternalError: Unexpected exception thrown

它说了cassandraTemplate和sessionFactory的依赖和bean创建问题。我是使用弹簧数据的新手，所以不确定我在这里错过了什么。

从启动日志中，我可以看到它正在使用以下驱动程序版本：

2020-06-08 22:44:57.782  INFO 42129 --- [  restartedMain] com.datastax.driver.core                 : DataStax Java driver 3.7.2 for Apache Cassandra

Answer 1

尝试调用 super，然后设置所需的属性

@Bean
public CassandraClusterFactoryBean cluster() {
CassandraClusterFactoryBean cluster = super.cluster();

cluster.setContactPoints("127.0.0.1");
cluster.setPort(9142);
return cluster;
}

Answer 2

解决了问题。问题是CassandraConfig类缺少这个：

@Override
protected boolean getMetricsEnabled() {
return false;
} 

添加了这个，它开始运行良好。

Answer 3

您的@configuration类有问题。 它没有@bean注释。 看看这个例子 卡桑德拉@configuration类来自： https://www.baeldung.com/spring-data-cassandra-tutorial

@Configuration
public class CassandraConfig extends AbstractCassandraConfiguration {
@Override
protected String getKeyspaceName() {
return "testKeySpace";
}
@Bean
public CassandraClusterFactoryBean cluster() {
CassandraClusterFactoryBean cluster = 
new CassandraClusterFactoryBean();
cluster.setContactPoints("127.0.0.1");
cluster.setPort(9142);
return cluster;
}
@Bean
public CassandraMappingContext cassandraMapping() 
throws ClassNotFoundException {
return new BasicCassandraMappingContext();
}
}

还介绍了如何配置存储库和表。