運行時發現報錯如下：
[0;39m Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'admin_Menu_Controller': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'menuService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'menuDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.kaspar.dao.MenuDao.findByPId(java.lang.Integer)! Unable to locate Attribute with the the given name [PId] on this ManagedType [com.kaspar.entity.Menu] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:337) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE] at com.kaspar.SiYunLianApplication.main(SiYunLianApplication.java:10) [classes/:na] Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'menuService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'menuDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.kaspar.dao.MenuDao.findByPId(java.lang.Integer)! Unable to locate Attribute with the the given name [PId] on this ManagedType [com.kaspar.entity.Menu] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:337) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:454) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:543) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:513) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:653) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:224) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:334) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] ... 17 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'menuDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.kaspar.dao.MenuDao.findByPId(java.lang.Integer)! Unable to locate Attribute with the the given name [PId] on this ManagedType [com.kaspar.entity.Menu] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:454) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:543) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:513) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:653) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:224) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:334) ~[spring-context-5.2.2.RELEASE.jar:5.2.2.RELEASE] ... 31 common frames omitted Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.kaspar.dao.MenuDao.findByPId(java.lang.Integer)! Unable to locate Attribute with the the given name [PId] on this ManagedType [com.kaspar.entity.Menu] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:102) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:106) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:211) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:574) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:567) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_101] at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[na:1.8.0_101] at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Collections.java:1049) ~[na:1.8.0_101] at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[na:1.8.0_101] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_101] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_101] at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_101] at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_101] at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_101] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:569) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_101] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:332) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.util.Lazy.getNullable(Lazy.java:212) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:121) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1855) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1792) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE] ... 44 common frames omitted Caused by: java.lang.IllegalArgumentException: Unable to locate Attribute with the the given name [PId] on this ManagedType [com.kaspar.entity.Menu] at org.hibernate.metamodel.model.domain.internal.AbstractManagedType.checkNotNull(AbstractManagedType.java:147) ~[hibernate-core-5.4.9.Final.jar:5.4.9.Final] at org.hibernate.metamodel.model.domain.internal.AbstractManagedType.getAttribute(AbstractManagedType.java:118) ~[hibernate-core-5.4.9.Final.jar:5.4.9.Final] at org.hibernate.metamodel.model.domain.internal.AbstractManagedType.getAttribute(AbstractManagedType.java:43) ~[hibernate-core-5.4.9.Final.jar:5.4.9.Final] at org.springframework.data.jpa.repository.query.QueryUtils.toExpressionRecursively(QueryUtils.java:633) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.QueryUtils.toExpressionRecursively(QueryUtils.java:617) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryCreator$PredicateBuilder.getTypedPath(JpaQueryCreator.java:385) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryCreator$PredicateBuilder.build(JpaQueryCreator.java:308) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryCreator.toPredicate(JpaQueryCreator.java:211) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryCreator.create(JpaQueryCreator.java:124) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.JpaQueryCreator.create(JpaQueryCreator.java:59) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.query.parser.AbstractQueryCreator.createCriteria(AbstractQueryCreator.java:119) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.query.parser.AbstractQueryCreator.createQuery(AbstractQueryCreator.java:95) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.repository.query.parser.AbstractQueryCreator.createQuery(AbstractQueryCreator.java:81) ~[spring-data-commons-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.<init>(PartTreeJpaQuery.java:227) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$CountQueryPreparer.<init>(PartTreeJpaQuery.java:359) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:97) ~[spring-data-jpa-2.2.3.RELEASE.jar:2.2.3.RELEASE] ... 70 common frames omitted
這個問題其實好坑，查了半天沒發現我哪里配置錯了，后來發現實體類聲明字段大小寫敏感。最直接導致原原因是：
因為是在加上紅框部分才出現的錯誤。后來查資料說是實體類聲明字段不規范導致的。
因為很多，再重新聲明字段然后改動需要很花功夫。不得已一個一個嘗試，不然只能寫成原生SQL。最后按下面的方法定義暫時沒有問題。
真是一開始沒有注意到的問題在后面需要折騰好久。順便來了解一下Jpa查詢的規則：
Spring Data JPA框架在進行方法名解析時，會先把方法名多余的前綴截取掉，比如 find、findBy、read、readBy、get、getBy，然后對剩下部分進行解析。
Eg.:findByTaskProjectName()
在解析該方法時，首先剔除 findBy，然后對剩下的屬性進行解析，假設查詢實體為A
1.先判斷 taskProjectName （根據 POJO 規范，首字母變為小寫）是否為查詢實體的一個屬性，如果是，則表示根據該屬性進行查詢；如果沒有該屬性，繼續第二步；
2.從右往左截取第一個大寫字母開頭的字符串此處為Name），然后檢查剩下的字符串是否為查詢實體的一個屬性，如果是，則表示根據該屬性進行查詢；如果沒有該屬性，則重復第二步，繼續從右往左截取；最后假設task為查詢實體Person的一個屬性；
3.接着處理剩下部分(ProjectName），先判斷 task 所對應的類型是否有projectName屬性，如果有，則表示該方法最終是根據 “ Person.task.projectName”的取值進行查詢；否則繼續按照步驟 2 的規則從右往左截取，最終表示根據 “Person.task.project.name” 的值進行查詢。
4.最后可能會存在一種特殊情況，比如 Person包含一個 task 的屬性，也有一個 projectName 屬性，此時會存在混淆。可以明確在屬性之間加上 “_” 以顯式表達意圖，比如 “findByTask_ProjectName()”
得出的處理辦法：
建議一開始設計時，設計字段符合駝峰規則。如果實在無法避免首字母必須大寫，那么可以用@query進行查詢。