MappingCassandraConverter的NPE

编程问答 2022-06-11

问题描述

当我尝试将对象插入数据库时​​，卡桑德拉转换器将引发NPE。日志中显示了POJO的json表示形式，在代码中用 @Table ， @PrimaryKey 和 @Column 字段进行了注释。 不知道这是否会影响它，但是POJO有一种用户定义的类型，我已经相应地注释为 @Cassandratype（type = Cassandratype.Name.UDT，userTypeName =“ announcement”）。该（公告字段）的POJO也用 @UserDefinedType（“ announcement”）标签标注。

按照示例here，我使用以下代码设置了cassandra会话

 public void initialize() {
    session = CqlSession.builder().addContactPoint(new InetSocketAddress(cassandraHost,cassandraPort))
            .withAuthCredentials(csUsername,csPassword)
            .withKeyspace(keyspace)
            .withLocalDatacenter("datacenter1")
            .build() ;
    template = new Cassandratemplate(session);

    logger.info("Cassandra client connection created");
}

public MetaDatatype saveMeta(MetaDatatype MetaDatatype) {
    logger.info("Adding new {} row for id: {}",MetaDatatype.getReferenceType().name(),MetaDatatype.getReferenceId());
    logger.info(new Gson().toJson(MetaDatatype,MetaDatatype.class) );
    return template.insert(MetaDatatype);
}

但是运行插入代码后，这就是我得到的

2020-09-29T09:40:34.683 INFO  [http-nio-7891-exec-1] MetaRepository:21 - Adding Metadatatype for ENTITY with id: ENTITY_d02f614f-2856-417e-a130-4a2aecd4817f
2020-09-29T09:40:34.684 INFO  [http-nio-7891-exec-1] PersistenceClient:80 - Adding new ENTITY row for id: d02f614f-2856-417e-a130-4a2aecd4817f
2020-09-29T09:40:34.710 INFO  [http-nio-7891-exec-1] PersistenceClient:81 - {"id":"ENTITY_d02f614f-2856-417e-a130-4a2aecd4817f","payments":["MOBILE_MONEY","CASH"],"pricerating":0,"announcement":{"timestamp":0,"message":"Shut for COVID-19"},"highlights":["LOCALLY_OWNED"],"deliveries":["VIRTUAL"],"wifiAvailable":true,"audiences":["KIDS"],"referenceType":"ENTITY","referenceId":"d02f614f-2856-417e-a130-4a2aecd4817f","addedTimestamp":1601386834683,"modifiedTimestamp":0,"Metatype":"EATERY","appointment":true,"seating":["INDOOR"],"accesses":["WHEELCHAIR"],"parking":["STREET"],"amenities":["dishwasher"],"facilities":["POOL"]}
2020-09-29T09:40:34.759 ERROR [http-nio-7891-exec-1] MetadataExchange:183 - Error occcured when adding Metadata
java.lang.NullPointerException: null
    at org.springframework.data.cassandra.core.convert.MappingCassandraConverter.lambda$new$1(MappingCassandraConverter.java:142) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.convert.DefaultColumnTypeResolver.getUserType(DefaultColumnTypeResolver.java:470) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.convert.DefaultColumnTypeResolver.resolve(DefaultColumnTypeResolver.java:260) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.convert.DefaultColumnTypeResolver.resolve(DefaultColumnTypeResolver.java:127) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.convert.MappingCassandraConverter.getWriteValue(MappingCassandraConverter.java:743) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.convert.MappingCassandraConverter.writeMapFromWrapper(MappingCassandraConverter.java:491) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.convert.MappingCassandraConverter.write(MappingCassandraConverter.java:457) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.StatementFactory.insert(StatementFactory.java:307) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.Cassandratemplate.doInsert(Cassandratemplate.java:639) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.Cassandratemplate.insert(Cassandratemplate.java:629) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at org.springframework.data.cassandra.core.Cassandratemplate.insert(Cassandratemplate.java:617) ~[spring-data-cassandra-3.0.4.RELEASE.jar!/:3.0.4.RELEASE]
    at com.ghyrate.dataservice.clients.PersistenceClient.saveMeta(PersistenceClient.java:82) ~[classes!/:1.0-SNAPSHOT]
    at com.ghyrate.dataservice.repository.MetaRepository.addMeta(MetaRepository.java:22) ~[classes!/:1.0-SNAPSHOT]
    at com.ghyrate.dataservice.processor.MetadataExchange.postMetadata(MetadataExchange.java:179) [classes!/:1.0-SNAPSHOT]
    at com.ghyrate.dataservice.controllers.MetaDataController.postEntity(MetaDataController.java:56) [classes!/:1.0-SNAPSHOT]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
    at org.springframework.web.method.support.invocableHandlerMethod.doInvoke(invocableHandlerMethod.java:190) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.method.support.invocableHandlerMethod.invokeForRequest(invocableHandlerMethod.java:138) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletinvocableHandlerMethod.invokeAndHandle(ServletinvocableHandlerMethod.java:105) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.dispatcherServlet.dodispatch(dispatcherServlet.java:1040) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.dispatcherServlet.doService(dispatcherServlet.java:943) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) [tomcat-embed-core-9.0.38.jar!/:4.0.FR]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) [tomcat-embed-core-9.0.38.jar!/:4.0.FR]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.springframework.boot.actuate.metrics.web.servlet.WebMvcmetricsFilter.doFilterInternal(WebMvcmetricsFilter.java:93) [spring-boot-actuator-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at org.apache.tomcat.util.net.socketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_131]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.38.jar!/:9.0.38]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]

这是我的pom 

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.4.RELEASE</version>
    <relativePath></relativePath>
</parent>
...
<dependency>
   <groupId>org.springframework.data</groupId>
   <artifactId>spring-data-cassandra</artifactId>
   <version>3.0.4.RELEASE</version>
</dependency>

编辑：包括POJO定义

@Table(value = "Metatable")
public class MetaDatatype {
    @Column @PrimaryKey
    private String id;
    @Column
    private Set<Payment> payments;
    @Column(value = "pricerating")
    private short pricerating;
    @Column
    @Cassandratype(type = Cassandratype.Name.UDT,userTypeName = "announcement")
    private BusinessAnnouncement announcement; //This is the only UDT,all others are enums
    @Column
    private Set<Highlight> highlights;
    @Column
    private Set<Delivery> deliveries;
    @Column(value = "wifiavailable")
    private boolean wifiAvailable;
    @Column
    private Set<Audience> audiences;
    @Column(value = "referencetype")
    private Config.ReferenceType referenceType;
    @Column(value = "referenceid")
    private String referenceId;
    @Column(value = "addedTimestamp")
    private long addedTimestamp;
    @Column(value = "pricerating")
    private long modifiedTimestamp;
    @Column
    private MetaType Metatype;
    @Column
    private boolean appointment;
    @Column
    private List<Seating> seating;
    @Column
    private List<disabilityAccess> accesses;
    @Column
    private List<Parking> parking;
    @Column
    private Set<Amenities> amenities;
    @Column
    private Set<Facilities> facilities;
  }

用户定义的数据类型类定义

@UserDefinedType("announcement")
public class BusinessAnnouncement {
    @Cassandratype(type = Cassandratype.Name.BIGINT)
    private long timestamp;
    @Cassandratype(type = Cassandratype.Name.TEXT)
    private String message;
}

解决方法

不包括用于实体定义/ UDT定义的代码，这很有用，但是我怀疑此处使用@CassandraType不太正确。驱动程序映射器文档：https://docs.datastax.com/en/developer/java-driver/4.9/manual/mapper/entities/#inheritance-不使用@CassandraType注释。

这假定您将对Cassandra使用较新的统一驱动程序，但pom文件中没有包含可见的驱动程序。

页面上有一个示例-只需为您注释实体，并且其中1个实体包含另一个实体，它将自动处理UDT方面。

cassandrajavajavaspring-bootspring-data-cassandra