Jpa自定义查询报错

问题背景

今天遇到一个奇怪的报错“Failed to convert from type [java.lang.Object[]] to type”，这个报错，百度上也是很少的，恰恰是这样的问题，引起我了解决的欲望。先看看报错：

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

在网上找了很多解决方案，多是要改变Springboot的配置，然而给便配置我肯定是不愿意的，于是经过千辛万苦，终于找到了解决方案。

出现该错误的原因可能是你在当前的Repository里面，查询了其他的实体，例如你在UserRepository extends JpaRepository<UserEntity,Integer>里面去自定义了一个查询，该查询返回的实体是CarEntity，那就会报这样的转换错误，每个实体要都要有一个对应的XXXRepository来执行CRUD操作的。实体Entity跟Repository层内容要对应，解决方案就是将这个自定义查询剪切到对应的Repository里面。