No converter found capable of converting from type to type

Question

I am getting the following stacktrace   org springframework core convert ConverterNotFoundException  No converter found capable of converting from type  referencedata ABDeadlineType  to type  referencedata DeadlineType      at org springframework core convert support GenericConversionService handleConverterNotFound GenericConversionService java 324      at org springframework core convert support GenericConversionService convert GenericConversionService java 206      at org springframework core convert support GenericConversionService convert GenericConversionService java 187      at org springframework data repository query ResultProcessor ProjectingConverter convert ResultProcessor java 256      at org springframework data repository query ResultProcessor ChainingConverter 1 convert ResultProcessor java 201      at org springframework data repository query ResultProcessor ChainingConverter convert ResultProcessor java 212      at org springframework data repository query ResultProcessor processResult ResultProcessor java 149      at org springframework data jpa repository query AbstractJpaQuery doExecute AbstractJpaQuery java 121      at org springframework data jpa repository query AbstractJpaQuery execute AbstractJpaQuery java 106      at org springframework data repository core support RepositoryFactorySupport QueryExecutorMethodInterceptor doInvoke RepositoryFactorySupport java 483      at org springframework data repository core support RepositoryFactorySupport QueryExecutorMethodInterceptor invoke RepositoryFactorySupport java 461      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework data projection DefaultMethodInvokingMethodInterceptor invoke DefaultMethodInvokingMethodInterceptor java 56      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework transaction interceptor TransactionInterceptor 1 proceedWithInvocation TransactionInterceptor java 99      at org springframework transaction interceptor TransactionAspectSupport invokeWithinTransaction TransactionAspectSupport java 282      at org springframework transaction interceptor TransactionInterceptor invoke TransactionInterceptor java 96      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework dao support PersistenceExceptionTranslationInterceptor invoke PersistenceExceptionTranslationInterceptor java 136      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework data jpa repository support CrudMethodMetadataPostProcessor CrudMethodMetadataPopulatingMethodInterceptor invoke CrudMethodMetadataPostProcessor java 133      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework aop interceptor ExposeInvocationInterceptor invoke ExposeInvocationInterceptor java 92      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework data repository core support SurroundingTransactionDetectorMethodInterceptor invoke SurroundingTransactionDetectorMethodInterceptor java 57      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179      at org springframework aop framework JdkDynamicAopProxy invoke JdkDynamicAopProxy java 213      at com sun proxy  Proxy143 findAllSummarizedBy Unknown Source      at    My classes are the following  DeadlineType    Data public class DeadlineType extends DefaultIdAndText        Value    target id        String id        Value    target code        String text        Value    target id        public String getId             return id              Value    target code        public String getText             return text             ABDeadlineType   Data  Entity  Table name    deadline type    AllArgsConstructor  NoArgsConstructor public class ABDeadlineType        private  Id     String id      private String code      DefaultIdAndText    Data  AllArgsConstructor  NoArgsConstructor public class DefaultIdAndText implements IdAndText        public DefaultIdAndText IdAndText idAndText           this id   idAndText getId            this text   idAndText getText                NotEmpty String id      String text      DeadlineTypeRepository   public interface DeadlineTypeRepository extends JpaRepository lt ABDeadlineType  Long gt        List lt DeadlineType gt  findAllSummarizedBy        Update  Could it be an issue that the projection mapping using  Value    target id    format  does not work correctly because these have been done on a class and not on an interface

User · Answer

Turns out  when the table name is different than the model name  you have to change the annotations to    Entity  Table name    table name   class WhateverNameYouWant             Instead of simply using the  Entity annotation   What was weird for me  is that the class it was trying to convert to didn t exist  This worked for me

User · Answer

You may already have this working  but the I created a test project with the classes below allowing you to retrieve the data into an entity  projection or dto   Projection - this will return the code column twice  once named code and also named text  for example only    As you say above  you don t need the  Projection annotation  import org springframework beans factory annotation Value   public interface DeadlineTypeProjection       String getId            can get code and or change name of getter below     String getCode            Points to the code attribute of entity class      Value value      target code        String getText        DTO class - not sure why this was inheriting from your base class and then redefining the attributes   JsonProperty just an example of how you d change the name of the field passed back to a REST end point  import com fasterxml jackson annotation JsonProperty  import lombok AllArgsConstructor  import lombok Data    Data  AllArgsConstructor public class DeadlineType       String id          Use this annotation if you need to change the name of the property that is passed back from controller        Needs to be called code to be used in Repository      JsonProperty value    text       String code       Entity class  import lombok Data   import javax persistence Entity  import javax persistence Id  import javax persistence Table    Data  Entity  Table name    deadline type   public class ABDeadlineType         Id     private String id      private String code      Repository - your repository extends JpaRepository lt ABDeadlineType  Long gt  but the Id is a String  so updated below to JpaRepository lt ABDeadlineType  String gt   import com example demo entity ABDeadlineType  import com example demo projection DeadlineTypeProjection  import com example demo transfer DeadlineType  import org springframework data jpa repository JpaRepository   import java util List   public interface ABDeadlineTypeRepository extends JpaRepository lt ABDeadlineType  String gt         List lt ABDeadlineType gt  findAll         List lt DeadlineType gt  findAllDtoBy         List lt DeadlineTypeProjection gt  findAllProjectionBy         Example Controller - accesses the repository directly to simplify code   RequestMapping value    deadlinetype    RestController public class DeadlineTypeController        private final ABDeadlineTypeRepository abDeadlineTypeRepository        Autowired     public DeadlineTypeController ABDeadlineTypeRepository abDeadlineTypeRepository            this abDeadlineTypeRepository   abDeadlineTypeRepository              GetMapping value     list       public ResponseEntity lt List lt ABDeadlineType gt  gt  list              List lt ABDeadlineType gt  types   abDeadlineTypeRepository findAll            return ResponseEntity ok types               GetMapping value     listdto       public ResponseEntity lt List lt DeadlineType gt  gt  listDto              List lt DeadlineType gt  types   abDeadlineTypeRepository findAllDtoBy            return ResponseEntity ok types               GetMapping value     listprojection       public ResponseEntity lt List lt DeadlineTypeProjection gt  gt  listProjection              List lt DeadlineTypeProjection gt  types   abDeadlineTypeRepository findAllProjectionBy            return ResponseEntity ok types             Hope that helps  Les

User · Answer

If you look at the exception stack trace it says that  it failed to convert from ABDeadlineType to DeadlineType  Because your repository is going to return you the objects of ABDeadlineType  How the spring-data-jpa will convert into the other one DeadlineType   You should return the same type from repository and then have some intermediate util class to convert it into your model class   public interface ABDeadlineTypeRepository extends JpaRepository lt ABDeadlineType  Long gt        List lt ABDeadlineType gt  findAllSummarizedBy

User · Answer

Return ABDeadlineType from repository   public interface ABDeadlineTypeRepository extends JpaRepository lt ABDeadlineType  Long gt        List lt ABDeadlineType gt  findAllSummarizedBy        and then convert to DeadlineType  Manually or use mapstruct   Or call constructor from  Query annotation   public interface DeadlineTypeRepository extends JpaRepository lt ABDeadlineType  Long gt          Query  select new package DeadlineType a id  a code  from ABDeadlineType a        List lt DeadlineType gt  findAllSummarizedBy        Or use  Projection    Projection name    deadline   types     ABDeadlineType class    public interface DeadlineType         Value    target id        String getId          Value    target code        String getText         Update  Spring can work without  Projection annotation   public interface DeadlineType       String getId            String getText

User · Answer

Simple Solution   use  nativeQuery true  in your query  for example    Query value    quot select d id d name d breed d origin from Dog d quot  nativeQuery   true               List lt Dog gt  findALL

[spring] No converter found capable of converting from type to type

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