Jpa自定義查詢報錯(Failed to convert from type [java.lang.Object[]] to type)

Jpa自定義查詢報錯

問題背景

今天遇到一個奇怪的報錯“Failed to convert from type [java.lang.Object[]] to type”，這個報錯，百度上也是很少的，恰恰是這樣的問題，引起我了解決的欲望。先看看報錯：

org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.Object[]] to type [org.microservice.tcbj.yytsg.checksys.entity.Wicket] for value '{1, 7, C1, 1, 7, 1}'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.Integer] to type [org.microservice.tcbj.yytsg.checksys.entity.Wicket]
	at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:46)
	at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:191)
	at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:174)
	at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:108)
	at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:136)
	at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:125)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:590)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
	at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvo

在網上找了很多解決方案，多是要改變Springboot的配置，然而給便配置我肯定是不願意的，於是經過千辛萬苦，終於找到了解決方案。
出現該錯誤的原因可能是你在當前的Repository里面，查詢了其他的實體，例如你在UserRepository extends JpaRepository<UserEntity,Integer>里面去自定義了一個查詢，該查詢返回的實體是CarEntity，那就會報這樣的轉換錯誤，每個實體要都要有一個對應的XXXRepository來執行CRUD操作的。實體Entity跟Repository層內容要對應，解決方案就是將這個自定義查詢剪切到對應的Repository里面。