我有以下bean
@Entity
@Access(AccessType.FIELD)
public class Child {
@Id @GeneratedValue
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
private Parent parent;
}
然后我宣布了存储库
public interface ChildRepository extends CrudRepository<Child, Long> {
List<Child> findByParent(Parent parent);
}
在控制器中自动装配
@Controller
public class AController {
@Autowired private ChildRepository childRepository;
}
启动服务器我收到以下错误：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'aController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private ChildRepository aController.childRepository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'childRepository': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
...
如果我删除方法findByParent一切都很好。可能是什么问题？
我正在使用spring-data-jpa：1.4.2.RELEASE和datanucleus-accessplatform -jpa-rdbms：3.3.4。
这是完整的堆栈
QueryUtils.getOrCreateJoin(From<?,?>, String) line: 511
QueryUtils.toExpressionRecursively(From<?,?>, PropertyPath) line: 453
JpaQueryCreator$PredicateBuilder.build() line: 197
JpaCountQueryCreator(JpaQueryCreator).toPredicate(Part, Root<?>) line: 144
JpaCountQueryCreator(JpaQueryCreator).create(Part, Iterator<Object>) line: 86
JpaCountQueryCreator(JpaQueryCreator).create(Part, Iterator) line: 44
JpaCountQueryCreator(AbstractQueryCreator<T,S>).createCriteria(PartTree) line: 109
JpaCountQueryCreator(AbstractQueryCreator<T,S>).createQuery(Sort) line: 88
JpaCountQueryCreator(AbstractQueryCreator<T,S>).createQuery() line: 73
PartTreeJpaQuery$CountQueryPreparer(PartTreeJpaQuery$QueryPreparer).<init>(PartTreeJpaQuery, boolean) line: 98
PartTreeJpaQuery$CountQueryPreparer.<init>(PartTreeJpaQuery, boolean) line: 186
PartTreeJpaQuery.<init>(JpaQueryMethod, EntityManager) line: 60
JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryMethod, EntityManager, NamedQueries) line: 90
JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryMethod, EntityManager, NamedQueries) line: 162
JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy(JpaQueryLookupStrategy$AbstractQueryLookupStrategy).resolveQuery(Method, RepositoryMetadata, NamedQueries) line: 68
RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport, RepositoryInformation, Object, Object) line: 290
JpaRepositoryFactory(RepositoryFactorySupport).getRepository(Class<T>, Object) line: 158
JpaRepositoryFactoryBean<T,S,ID>(RepositoryFactoryBeanSupport<T,S,ID>).getObject() line: 162
JpaRepositoryFactoryBean<T,S,ID>(RepositoryFactoryBeanSupport<T,S,ID>).getObject() line: 44
DefaultListableBeanFactory(FactoryBeanRegistrySupport).doGetObjectFromFactoryBean(FactoryBean<?>, String, boolean) line: 144
DefaultListableBeanFactory(FactoryBeanRegistrySupport).getObjectFromFactoryBean(FactoryBean<?>, String, boolean) line: 103
DefaultListableBeanFactory(AbstractBeanFactory).getObjectForBeanInstance(Object, String, String, RootBeanDefinition) line: 1514
DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 252
DefaultListableBeanFactory(AbstractBeanFactory).getBean(String, Class<T>) line: 200
DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 273
DefaultListableBeanFactory(AbstractBeanFactory).getBean(String) line: 195
DefaultListableBeanFactory.findAutowireCandidates(String, Class<?>, DependencyDescriptor) line: 1014
DefaultListableBeanFactory.doResolveDependency(DependencyDescriptor, String, Set<String>, TypeConverter) line: 957
DefaultListableBeanFactory.resolveDependency(DependencyDescriptor, String, Set<String>, TypeConverter) line: 855
AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(Object, String, PropertyValues) line: 480
InjectionMetadata.inject(Object, String, PropertyValues) line: 87
AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(PropertyValues, PropertyDescriptor[], Object, String) line: 289
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).populateBean(String, RootBeanDefinition, BeanWrapper) line: 1185
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).doCreateBean(String, RootBeanDefinition, Object[]) line: 537
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBean(String, RootBeanDefinition, Object[]) line: 475
AbstractBeanFactory$1.getObject() line: 304
DefaultListableBeanFactory(DefaultSingletonBeanRegistry).getSingleton(String, ObjectFactory<?>) line: 228
DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 300
DefaultListableBeanFactory(AbstractBeanFactory).getBean(String) line: 195
DefaultListableBeanFactory.preInstantiateSingletons() line: 700
XmlWebApplicationContext(AbstractApplicationContext).finishBeanFactoryInitialization(ConfigurableListableBeanFactory) line: 760
XmlWebApplicationContext(AbstractApplicationContext).refresh() line: 482
DispatcherServlet(FrameworkServlet).configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext) line: 643
DispatcherServlet(FrameworkServlet).createWebApplicationContext(ApplicationContext) line: 606
DispatcherServlet(FrameworkServlet).createWebApplicationContext(WebApplicationContext) line: 657
DispatcherServlet(FrameworkServlet).initWebApplicationContext() line: 525
DispatcherServlet(FrameworkServlet).initServletBean() line: 466
DispatcherServlet(HttpServletBean).init() line: 136
DispatcherServlet(GenericServlet).init(ServletConfig) line: 160
StandardWrapper.initServlet(Servlet) line: 1280
StandardWrapper.loadServlet() line: 1193
StandardWrapper.load() line: 1088
StandardContext.loadOnStartup(Container[]) line: 5176
StandardContext.startInternal() line: 5460
StandardContext(LifecycleBase).start() line: 150
ContainerBase$StartChild.call() line: 1559
ContainerBase$StartChild.call() line: 1549
FutureTask$Sync.innerRun() line: 334
FutureTask<V>.run() line: 166
ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) line: 1145
ThreadPoolExecutor$Worker.run() line: 615
Thread.run() line: 724
降级到spring-data：1.3.0，解决了这个问题。我有一个类似的问题。 Spring data error