Java spring数据cassandra找不到UserDefinedType

根据教程，我正在试验UserDefinedType注释

我将项目升级为使用spring数据cassandra:1.5.0.BUILD-SNAPSHOT，在书中添加了属性price，实现了相应的UserDefinedType，并在配置中添加了setInitialEntitySet和setUserTypeResolver

然后对cassandra 3.9执行BookRepositoryIntegrationTest时，我得到以下错误：

org.springframework.data.mapping.model.MappingException:未找到用户类型[价格]

知道我错过了什么吗

这是我的零钱

Book.java：

package org.baeldung.spring.data.cassandra.model;

import java.util.HashSet;
import java.util.Set;
import java.util.UUID;

import org.springframework.cassandra.core.Ordering;
import org.springframework.cassandra.core.PrimaryKeyType;
import org.springframework.data.cassandra.mapping.Column;
import org.springframework.data.cassandra.mapping.PrimaryKeyColumn;
import org.springframework.data.cassandra.mapping.Table;

@Table
public class Book {

    @PrimaryKeyColumn(name = "id", ordinal = 0, type = PrimaryKeyType.CLUSTERED, ordering = Ordering.DESCENDING)
    private UUID id;

    @PrimaryKeyColumn(name = "title", ordinal = 1, type = PrimaryKeyType.PARTITIONED)
    private String title;

    @PrimaryKeyColumn(name = "publisher", ordinal = 2, type = PrimaryKeyType.PARTITIONED)
    private String publisher;

    @Column
    private Set<String> tags = new HashSet<>();

    private Price price;

    public Book(final UUID id, final String title, final String publisher, final Set<String> tags) {
        this.id = id;
        this.title = title;
        this.publisher = publisher;
        this.tags.addAll(tags);
    }
}

Price.java：

package org.baeldung.spring.data.cassandra.model;

import org.springframework.data.cassandra.mapping.Column;
import org.springframework.data.cassandra.mapping.UserDefinedType;

@UserDefinedType
public class Price {

    @Column
    private Double amount;

    @Column
    private String currency;

    public Price(Double amount, String currency) {
        this.amount = amount;
        this.currency = currency;
    }

    public Double getAmount() {
        return amount;
    }

    public String getCurrency() {
        return currency;
    }
}

---

尝试使用下面的CassandraConfig类

@Configuration
@PropertySource(value = { "classpath:cassandra.properties" })
@EnableCassandraRepositories(basePackages = "org.baeldung.spring.data.cassandra.repository")
public class CassandraConfig extends AbstractCassandraConfiguration {
private static final Log LOGGER = LogFactory.getLog(CassandraConfig.class);

@Autowired
private Environment environment;

@Override
protected String getKeyspaceName() {
    return environment.getProperty("cassandra.keyspace");
}

@Override
@Bean
public CassandraClusterFactoryBean cluster() {
    final CassandraClusterFactoryBean cluster = new CassandraClusterFactoryBean();
    cluster.setContactPoints(environment.getProperty("cassandra.contactpoints"));
    cluster.setPort(Integer.parseInt(environment.getProperty("cassandra.port")));
    LOGGER.info("Cluster created with contact points [" + environment.getProperty("cassandra.contactpoints") + "] " + "& port [" + Integer.parseInt(environment.getProperty("cassandra.port")) + "].");
    return cluster;
}


@Bean
public CassandraMappingContext mappingContext() throws ClassNotFoundException {
    BasicCassandraMappingContext mappingContext = new BasicCassandraMappingContext();
    mappingContext.setInitialEntitySet(CassandraEntityClassScanner.scan("org.baeldung.spring.data.cassandra.model"));
    mappingContext.setUserTypeResolver(new SimpleUserTypeResolver(cluster().getObject(),getKeyspaceName()));
    return mappingContext;
}

@Bean
public CassandraConverter converter() throws ClassNotFoundException {
    return new MappingCassandraConverter(mappingContext());
}

@Bean
public CassandraSessionFactoryBean session() throws ClassNotFoundException {
    CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
    session.setCluster(cluster().getObject());
    session.setKeyspaceName(getKeyspaceName());
    session.setConverter(converter());
    session.setSchemaAction(SchemaAction.RECREATE);
    return session;
  }
}

---

尝试使用下面的CassandraConfig类

@Configuration
@PropertySource(value = { "classpath:cassandra.properties" })
@EnableCassandraRepositories(basePackages = "org.baeldung.spring.data.cassandra.repository")
public class CassandraConfig extends AbstractCassandraConfiguration {
private static final Log LOGGER = LogFactory.getLog(CassandraConfig.class);

@Autowired
private Environment environment;

@Override
protected String getKeyspaceName() {
    return environment.getProperty("cassandra.keyspace");
}

@Override
@Bean
public CassandraClusterFactoryBean cluster() {
    final CassandraClusterFactoryBean cluster = new CassandraClusterFactoryBean();
    cluster.setContactPoints(environment.getProperty("cassandra.contactpoints"));
    cluster.setPort(Integer.parseInt(environment.getProperty("cassandra.port")));
    LOGGER.info("Cluster created with contact points [" + environment.getProperty("cassandra.contactpoints") + "] " + "& port [" + Integer.parseInt(environment.getProperty("cassandra.port")) + "].");
    return cluster;
}


@Bean
public CassandraMappingContext mappingContext() throws ClassNotFoundException {
    BasicCassandraMappingContext mappingContext = new BasicCassandraMappingContext();
    mappingContext.setInitialEntitySet(CassandraEntityClassScanner.scan("org.baeldung.spring.data.cassandra.model"));
    mappingContext.setUserTypeResolver(new SimpleUserTypeResolver(cluster().getObject(),getKeyspaceName()));
    return mappingContext;
}

@Bean
public CassandraConverter converter() throws ClassNotFoundException {
    return new MappingCassandraConverter(mappingContext());
}

@Bean
public CassandraSessionFactoryBean session() throws ClassNotFoundException {
    CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
    session.setCluster(cluster().getObject());
    session.setKeyspaceName(getKeyspaceName());
    session.setConverter(converter());
    session.setSchemaAction(SchemaAction.RECREATE);
    return session;
  }
}

---

您的代码看起来不错，但未创建用户类型。您还配置了查找用户类型所需的

SimpleUserTypeResolver

未找到用户类型[price]表示在Cassandra中未找到该用户类型

您有两个选项来解决此问题：

您可以自己创建用户定义的类型

使用

SchemaAction。在引导应用程序时重新创建

Baeldung在测试中使用表创建，因此在创建表之前手动创建用户类型可能是更好的选择

CreateUserTypeSpecification userTypeSpecification = mappingContext.
                             getCreateUserTypeSpecificationFor(mappingContext.getExistingPersistentEntity(Price.class))
                            .ifNotExists(ifNotExists);

cqlTemplate.execute(CreateUserTypeCqlGenerator.toCql(userTypeSpecification));

---

您的代码看起来不错，但未创建用户类型。您还配置了查找用户类型所需的

SimpleUserTypeResolver

未找到用户类型[price]表示在Cassandra中未找到该用户类型

您有两个选项来解决此问题：

您可以自己创建用户定义的类型

使用

SchemaAction。在引导应用程序时重新创建

Baeldung在测试中使用表创建，因此在创建表之前手动创建用户类型可能是更好的选择

CreateUserTypeSpecification userTypeSpecification = mappingContext.
                             getCreateUserTypeSpecificationFor(mappingContext.getExistingPersistentEntity(Price.class))
                            .ifNotExists(ifNotExists);

cqlTemplate.execute(CreateUserTypeCqlGenerator.toCql(userTypeSpecification));

---

嘿，工作起来很有魅力！如果说MappingCassandraConverter就是诀窍，我说得对吗？此外，我必须向bean中添加默认构造函数才能加载它们。非常感谢：）很高兴听到这个消息。请接受答案，以便对其他人有所帮助。类似的问题在这里（）。让UDT使用Spring数据的步骤CassandraHey，工作起来很有魅力！如果说MappingCassandraConverter就是诀窍，我说得对吗？此外，我必须向bean中添加默认构造函数才能加载它们。非常感谢：）很高兴听到这个消息。请接受答案，以便对其他人有所帮助。类似的问题在这里（）。让UDT使用Spring数据Cassandra的步骤