spring-data-cassandra 找不到 UserDefinedType答案

【问题标题】：UserDefinedType not found by spring-data-cassandraspring-data-cassandra 找不到 UserDefinedType
【发布时间】：2017-07-27 13:10:43
【问题描述】：

基于教程spring-data-cassandra-tutorial 我正在尝试使用 UserDefinedType 注释。

我将项目升级为使用spring-data-cassandra:1.5.0.BUILD-SNAPSHOT，将属性price添加到book，实现了对应的UserDefinedType，并在配置中添加了setInitialEntitySet和setUserTypeResolver。

当我对 cassandra 3.9 执行 BookRepositoryIntegrationTest 时，我收到以下错误：

org.springframework.data.mapping.model.MappingException：找不到用户类型[价格]

知道我错过了什么吗？

这是我的更改...

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);
    }
}

pom.xml：

    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.baeldung</groupId>
    <artifactId>spring-data-cassandra</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-data-cassandra</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <org.springframework.version>4.3.4.RELEASE</org.springframework.version>

        <org.springframework.data.version>1.5.0.BUILD-SNAPSHOT</org.springframework.data.version>

        <junit.version>4.12</junit.version>
        <org.slf4j.version>1.7.12</org.slf4j.version>
        <logback.version>1.1.3</logback.version>
        <cassandra-driver-core.version>3.1.2</cassandra-driver-core.version>
        <cassandra-unit.version>3.0.0.1</cassandra-unit.version>
        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>        
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-cassandra</artifactId>
            <version>${org.springframework.data.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${org.springframework.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.cassandraunit</groupId>
            <artifactId>cassandra-unit-spring</artifactId>
            <version>${cassandra-unit.version}</version>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.cassandraunit</groupId>
                    <artifactId>cassandra-unit</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.cassandraunit</groupId>
            <artifactId>cassandra-unit</artifactId>
            <version>${cassandra-unit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-core</artifactId>
            <version>${cassandra-driver-core.version}</version>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${org.slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>${logback.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${org.slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>log4j-over-slf4j</artifactId>
            <version>${org.slf4j.version}</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
                     <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-surefire-plugin</artifactId>
                        <version>${maven-surefire-plugin.version}</version>
                        <configuration>
                            <excludes>
                                <exclude>**/*IntegrationTest.java</exclude>
                                <exclude>**/*LiveTest.java</exclude>
                            </excludes>
                        </configuration>
                    </plugin>
                </plugins>
            </build>

    <profiles>
        <profile>
            <id>integration</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-surefire-plugin</artifactId>
                        <executions>
                            <execution>
                                <phase>integration-test</phase>
                                <goals>
                                    <goal>test</goal>
                                </goals>
                                <configuration>
                                    <excludes>
                                        <exclude>**/*LiveTest.java</exclude>
                                    </excludes>
                                    <includes>
                                        <include>**/*IntegrationTest.java</include>
                                    </includes>
                                </configuration>
                            </execution>
                        </executions>
                        <configuration>
                            <systemPropertyVariables>
                                <test.mime>json</test.mime>
                            </systemPropertyVariables>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
</project>

CassandraConfig.java

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.baeldung.spring.data.cassandra.model.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.data.cassandra.config.CassandraClusterFactoryBean;
import org.springframework.data.cassandra.config.CassandraEntityClassScanner;
import org.springframework.data.cassandra.config.java.AbstractCassandraConfiguration;
import org.springframework.data.cassandra.mapping.BasicCassandraMappingContext;
import org.springframework.data.cassandra.mapping.CassandraMappingContext;
import org.springframework.data.cassandra.mapping.SimpleUserTypeResolver;
import org.springframework.data.cassandra.repository.config.EnableCassandraRepositories;

@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;
    }

    @Override
    @Bean
    public CassandraMappingContext cassandraMapping() throws ClassNotFoundException {
        BasicCassandraMappingContext ctx = new BasicCassandraMappingContext();
        ctx.setInitialEntitySet(CassandraEntityClassScanner.scan(Book.class));
        ctx.setUserTypeResolver(new SimpleUserTypeResolver(cluster().getObject(), getKeyspaceName()));
        return ctx;
    }
}

价格.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;
    }
}

【问题讨论】：

标签： java spring spring-data spring-data-cassandra

【解决方案1】：

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;
  }
}

【讨论】：

嘿，就像一个魅力！如果说 MappingCassandraConverter 是诀窍，我是对的吗？此外，我必须向我的 bean 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(stackoverflow.com/questions/38862460/…)。让 UDT 使用 Spring 数据 Cassandra 的步骤

【解决方案2】：

您的代码看起来不错，但错过了用户类型的创建。您还配置了查找用户类型所需的SimpleUserTypeResolver。

未找到用户类型 [价格] 表示在 Cassandra 中未找到用户类型。

你有两个选择来解决这个问题：

您自己创建用户定义类型。
在引导应用程序时使用SchemaAction.RECREATE。

Baeldung 的 tutorial 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));

【讨论】：