本文介绍了找不到能够从类型转换为类型的转换器的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
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
我的课程如下
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<ABDeadlineType, Long> {
List<DeadlineType> findAllSummarizedBy();
}
更新
使用@Value("#{target.id}")
格式进行投影/映射可能无法正常工作,因为这些操作是在类上完成的,而不是在接口上完成的吗?
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???
推荐答案
从存储库中返回ABDeadlineType
:
public interface ABDeadlineTypeRepository extends JpaRepository<ABDeadlineType, Long> {
List<ABDeadlineType> findAllSummarizedBy();
}
,然后转换为DeadlineType.手动或使用mapstruct.
and then convert to DeadlineType. Manually or use mapstruct.
或从@Query
批注中调用构造函数:
Or call constructor from @Query
annotation:
public interface DeadlineTypeRepository extends JpaRepository<ABDeadlineType, Long> {
@Query("select new package.DeadlineType(a.id, a.code) from ABDeadlineType a ")
List<DeadlineType> findAllSummarizedBy();
}
或使用@Projection
:
@Projection(name = "deadline", types = { ABDeadlineType.class })
public interface DeadlineType {
@Value("#{target.id}")
String getId();
@Value("#{target.code}")
String getText();
}
更新:Spring可以在没有@Projection
批注的情况下工作:
Update:Spring can work without @Projection
annotation:
public interface DeadlineType {
String getId();
String getText();
}
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