使用Morphia </map>从MongoDb中的Collection中获取带有List <map>类型字段的文档

时间：2015-03-13 12:42:57

标签： java mongodb morphia

我正在保存集合中的Map列表。它被保存为Mongo上的对象数组。 但是当从Morphia触发查找查询时，它会抛出空指针异常。在这里我使用Map，所以我认为不需要使用任何转换器，因为它已经存在于morphia库中。 在调试API时，发现了

public Object decode(final Class c, final Object fromDBObject) {
        return decode(c, fromDBObject, null);
    }
从DefaultConverters调用

，这个方法依次找到要调用的转换器，并调用MapOfValuesConverter并抛出空指针，因为从DefaultConverters类传递了这个空值。

但我无法找到导致问题的原因。

我的实体类就像：

@Entity(value = "entity", noClassnameStored = true)
class Entity{
   @Id
   private long id;
   @Property
   private List<Map> listOfMap; 
 }

主键查找器如下：

badgeDraftDao.findOne("_id", id)

任何帮助都会受到高度关注。

下面是堆栈跟踪：

java.lang.NullPointerException: null
    at org.mongodb.morphia.mapping.DefaultCreator.createMap(DefaultCreator.java:105) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.converters.MapOfValuesConverter.decode(MapOfValuesConverter.java:40) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.converters.DefaultConverters.decode(DefaultConverters.java:222) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.converters.DefaultConverters.decode(DefaultConverters.java:226) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.converters.IterableConverter.decode(IterableConverter.java:53) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.converters.DefaultConverters.fromDBObject(DefaultConverters.java:134) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.mapping.ValueMapper.fromDBObject(ValueMapper.java:27) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.mapping.Mapper.readMappedField(Mapper.java:604) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.mapping.Mapper.fromDb(Mapper.java:585) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.mapping.Mapper.fromDBObject(Mapper.java:296) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.query.MorphiaIterator.convertItem(MorphiaIterator.java:78) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.query.MorphiaIterator.processItem(MorphiaIterator.java:65) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.query.MorphiaIterator.next(MorphiaIterator.java:60) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.query.QueryImpl.get(QueryImpl.java:415) ~[morphia-0.107.jar:na]
    at org.mongodb.morphia.dao.BasicDAO.findOne(BasicDAO.java:194) ~[morphia-0.107.jar:na]
    at in.til.tp.core.service.impl.BadgeDraftServiceImpl.findByPrimaryKey(BadgeDraftServiceImpl.java:26) ~[TimespointsV2-core-1.0.jar:na]
    at in.til.ssm.controller.badges.BadgeViewController.createBadgeStep2(BadgeViewController.java:70) ~[BadgeViewController.class:na]
    at in.til.ssm.controller.badges.BadgeViewController$$FastClassBySpringCGLIB$$1944c197.invoke(<generated>) ~[spring-core-4.0.7.RELEASE.jar:na]
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:640) ~[spring-aop-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at in.til.ssm.controller.badges.BadgeViewController$$EnhancerBySpringCGLIB$$1c7c54e3_2.createBadgeStep2(<generated>) ~[spring-core-4.0.7.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_75]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_75]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_75]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_75]
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215) ~[spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) ~[spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749) ~[spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689) ~[spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) ~[spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938) [spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870) [spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) [spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) [spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) [servlet-api.jar:na]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) [spring-webmvc-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) [servlet-api.jar:na]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) [catalina.jar:7.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.41]
    at org.apache.catalina.filters.CorsFilter.handleNonCORS(CorsFilter.java:439) [catalina.jar:7.0.41]
    at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:178) [catalina.jar:7.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.41]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:85) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) [spring-security-web-3.2.4.RELEASE.jar:3.2.4.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344) [spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261) [spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.41]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) [catalina.jar:7.0.41]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) [catalina.jar:7.0.41]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [catalina.jar:7.0.41]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) [catalina.jar:7.0.41]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) [catalina.jar:7.0.41]
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) [catalina.jar:7.0.41]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [catalina.jar:7.0.41]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) [catalina.jar:7.0.41]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) [tomcat-coyote.jar:7.0.41]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) [tomcat-coyote.jar:7.0.41]
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) [tomcat-coyote.jar:7.0.41]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_75]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_75]
    at java.lang.Thread.run(Thread.java:745) [na:1.7.0_75]

2 个答案:

答案 0 :(得分：0)

好吧，坏消息和好消息。您已经在0.110中对Morphia的映射逻辑进行了限制，因此该实体将无法工作。好消息是，我有一个将在0.111即将推出的解决方案。

答案 1 :(得分：0)

我验证了此问题的修复程序，但是当我删除@Property注释时，它引发了另一个异常。我在前面提交的一个非常相同的问题的评论中提供了更多细节： https://github.com/mongodb/morphia/issues/718

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