错误：找不到能够从类型 JPA Model 类型转换为自定义类型 object [型号] 的转换器

Question

1. This is my pojo class.

public class Payload {

private Clob paylaod;


public Clob getPaylaod() {
    return paylaod;
}

public void setPaylaod(Clob paylaod) {
    this.paylaod = paylaod;
}

}

2. This is my entity class.

@Entity
@Table(name ="ORDER")
@Data
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Model implements Serializable {
    
        @Id
        @Column(name = "REQUEST_ID", nullable = false, unique = true)
        private String requestId;

        @Column(name = "VERSION")
        private BigDecimal version;

        @Column(name = "SOURCE")
        private String source;

        @Column(name = "SOURCE_ID")
        private String sourceId;
        
        @Lob
        @Column(name = "PAYLOAD")
        private Clob  payload;
}

3.This is my repository.

public interface OrderRepository extends JpaRepository<Model, String>
{
    
    @Query(value="SELECT PAYLOAD FROM ORDER WHERE REQUEST_ID = ?",nativeQuery = true)
    Payload getDetailsById(String requestId);
}

4. Below is controller class.

@RestController
@RequestMapping("/v1/order-data/Order")
public class OrderController {
    
    @Autowired
    OrderRepository repository;
    
    
    @GetMapping("/getDetailsById/{requestId}")
    public Payload getDetailsById(@PathVariable("requestId") String id) {
        return  repository.getDetailsById(id);
    }
    
}

4.Getting Below error:

** org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] to type [model.Payload] at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:322) ~[spring-core-5.3.10.jar:5.3.10] at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:195) ~[spring-core-5.3.10.jar:5.3.10] at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:175) ~[spring-core-5.3.10.jar:5.3.10] at org.springframework.data.repository.query.ResultProcessor$ProjectingConverter.convert(ResultProcessor.java:313) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.data.repository.query.ResultProcessor$Cha iningConverter.lambda$and$0(ResultProcessor.java:229) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.data.repository.query.ResultProcessor$ChainingConverter.convert(ResultProcessor.java:240) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.data.repository.query.ResultProcessor.processResult(ResultProcessor.java:170) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:158) ~[spring-data-jpa-2.4.13.jar:2.4.13] at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:143) ~[spring-data-jpa-2.4.13.jar:2.4.13] at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework. data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:152) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:131) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.4.13.jar:2.4.13] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation. java:186) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.10.jar:5.3.10] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.10.jar:5.3.10] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.10.jar:5.3.10] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.10.jar:5.3.10] at org.springframework.aop.framework.ReflectiveMethodInvocati on.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:145) ~[spring-data-jpa-2.4.13.jar:2.4.13] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.10.jar:5.3.10] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.10.jar:5.3.10] at com.s un.proxy.$Proxy121.getDetailsById(Unknown Source) ~[na:na] at Controller.getDetailsById(Controller.java:62) ~[classes/:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.servlet.mvc.method.ann otation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServl et.java:963) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.10.jar:5.3.10] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.10.jar:5.3.10] at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.53.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.10.jar:5.3.10] at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.53.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalin a.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.53.jar:9.0.53] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterC hain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetri csFilter.doFilterInternal(WebMvcMetricsFilter.java:97) ~[spring-boot-actuator-2.4.11.jar:2.4.11] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.10.jar:5.3.10] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.10.jar:5.3.10] at org.apache.catalina.core.ApplicationFilterChain.inter nalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core- 9.0.53.jar:9.0.53] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1726) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.tomcat.util.net.Socke tProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.53.jar:9.0.53] at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na] **

Answer 1

You're running a native query and not a JPA query and that's why the return type of getDetailsById(String requestId) is Object[] and not Clob or Model. Let's say your entity has 4 columns then object[0] will return the first column, object[1] will return the second column, and so on.

I'd suggest not to take away good things by using native queries. Just use JPA query and be happy:)

Modify your method signature the following way

public interface OrderRepository extends JpaRepository<Model, String>
{
    @Query(value="SELECT o.payload FROM ORDER o WHERE o.requestId = ?1")
    Payload getDetailsById(String requestId);
}

Answer 2

I think the return type of your method getDetailsById() is Payload instead of Clob, change that and try to run. that might work.

Answer 3

Because there's no relation between the payload Entity and the Model entity,Model entity have a CLOB type payload NOT an entity,so what you can do is add a relation between the two Entities as follows, so you can request the Payload with the specific request_id,since here it will hold the request_id as a foreign key in the db table,here's a snippet example:

@Entity
public class Payload {
 
 @Lob
 private Clob paylaod;
 
 @OneToOne
 @JoinColumn(name="request_id")
 private Model model;

 public Clob getPaylaod() {
  return paylaod;
 }

 public void setPaylaod(Clob paylaod) {
  this.paylaod = paylaod;
 }
}

and in your Model class have a relation to it lets say OneToOne as follows:

@Entity
@Table(name ="ORDER")
@Data
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Model implements Serializable {

    @Id
    @Column(name = "REQUEST_ID", nullable = false, unique = true)
    private String requestId;

    @Column(name = "VERSION")
    private BigDecimal version;

    @Column(name = "SOURCE")
    private String source;

    @Column(name = "SOURCE_ID")
    private String sourceId;
    
  
    @OneToOne(mappedBy="model")
    private Payload payload;

}

now you can use a native query or a JPQL query to retrieve what you want,eg:

@Query(value="select * from payload where 
payload.request_id=:requestId",nativeQuery=true)
Payload findByRequestId(@Param("requestId") String requestId);

hope this helps !