最近，我一直在使用Hybris平台，今天在Tomcat中遇到了一个异常。问题是我似乎找不到关于NestedServletException是什么或引发原因的任何有价值的信息。目前，我的首要任务是理解概念，然后解决它。
如果有用，我将附加StackTrace：
Estado HTTP 500 - Error while processing internal filterchain. Exception occurred at chain position: 5 of 15. Current filter: 'es.logista.storefront.filters.cms.CMSSiteFilter@539dc64a'!; nested exception is java.lang.NullPointerException
type Informe de Excepción
mensaje Error while processing internal filterchain. Exception occurred at chain position: 5 of 15. Current filter: 'es.logista.storefront.filters.cms.CMSSiteFilter@539dc64a'!; nested exception is java.lang.NullPointerException
descripción El servidor encontró un error interno que hizo que no pudiera rellenar este requerimiento.
excepción
org.springframework.web.util.NestedServletException: Error while processing internal filterchain. Exception occurred at chain position: 5 of 15. Current filter: 'es.logista.storefront.filters.cms.CMSSiteFilter@539dc64a'!; nested exception is java.lang.NullPointerException
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:234)
es.logista.storefront.filters.RequestLoggerFilter.doFilter(RequestLoggerFilter.java:89)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
es.logista.storefront.filters.AcceleratorAddOnFilter.doFilter(AcceleratorAddOnFilter.java:92)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
de.hybris.platform.servicelayer.web.SessionFilter.doFilter(SessionFilter.java:73)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
de.hybris.platform.servicelayer.web.Log4JFilter.doFilter(Log4JFilter.java:47)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain.doFilterInternal(AbstractPlatformFilterChain.java:156)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
es.logista.storefront.filters.AcceleratorAddOnFilter.doFilter(AcceleratorAddOnFilter.java:92)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
de.hybris.platform.servicelayer.web.XSSFilter.doFilter(XSSFilter.java:230)
causa raíz
java.lang.NullPointerException
java.util.concurrent.ConcurrentHashMap.get(Unknown Source)
de.hybris.platform.persistence.property.PersistenceInfoCache.getCachedExternalTableTypes(PersistenceInfoCache.java:70)
de.hybris.platform.persistence.property.DBPersistenceManager.getExternalTableTypes(DBPersistenceManager.java:883)
de.hybris.platform.persistence.flexiblesearch.typecache.impl.DefaultFlexibleSearchTypeCacheProvider.getExternalTableTypes(DefaultFlexibleSearchTypeCacheProvider.java:137)
de.hybris.platform.persistence.flexiblesearch.ParsedType.<init>(ParsedType.java:93)
de.hybris.platform.persistence.flexiblesearch.ParsedType.<init>(ParsedType.java:78)
de.hybris.platform.persistence.flexiblesearch.FromClause.createSingleType(FromClause.java:89)
de.hybris.platform.persistence.flexiblesearch.FromClause.translateNested(FromClause.java:73)
de.hybris.platform.persistence.flexiblesearch.ParsedText$2.translate(ParsedText.java:269)
de.hybris.platform.persistence.flexiblesearch.FlexibleSearchTools.replace(FlexibleSearchTools.java:310)
de.hybris.platform.persistence.flexiblesearch.ParsedText.translate(ParsedText.java:263)
de.hybris.platform.persistence.flexiblesearch.FromClause.translate(FromClause.java:48)
de.hybris.platform.persistence.flexiblesearch.ParsedQuery.translate(ParsedQuery.java:401)
de.hybris.platform.persistence.flexiblesearch.ParsedQuery.getTranslatedQuery(ParsedQuery.java:181)
de.hybris.platform.persistence.flexiblesearch.QueryParser.translateQuery(QueryParser.java:229)
de.hybris.platform.jalo.flexiblesearch.FlexibleSearch.translate(FlexibleSearch.java:2007)
de.hybris.platform.jalo.flexiblesearch.FlexibleSearch.search(FlexibleSearch.java:1412)
de.hybris.platform.jalo.flexiblesearch.FlexibleSearch.search(FlexibleSearch.java:1628)
de.hybris.platform.servicelayer.search.impl.DefaultFlexibleSearchService$2.execute(DefaultFlexibleSearchService.java:374)
de.hybris.platform.servicelayer.search.impl.DefaultFlexibleSearchService$2.execute(DefaultFlexibleSearchService.java:1)
de.hybris.platform.servicelayer.session.impl.DefaultSessionService.executeInLocalView(DefaultSessionService.java:91)
de.hybris.platform.servicelayer.search.impl.DefaultFlexibleSearchService.getJaloResult(DefaultFlexibleSearchService.java:363)
de.hybris.platform.servicelayer.search.impl.DefaultFlexibleSearchService.search(DefaultFlexibleSearchService.java:164)
de.hybris.platform.servicelayer.internal.dao.AbstractItemDao.search(AbstractItemDao.java:70)
de.hybris.platform.cms2.servicelayer.daos.impl.DefaultCMSSiteDao.findAllCMSSites(DefaultCMSSiteDao.java:42)
de.hybris.platform.cms2.servicelayer.services.impl.DefaultCMSSiteService.getSites(DefaultCMSSiteService.java:317)
de.hybris.platform.cms2.servicelayer.services.impl.DefaultCMSSiteService.getSiteForURL(DefaultCMSSiteService.java:269)
de.hybris.platform.acceleratorcms.context.impl.DefaultContextInformationLoader.initializeSiteFromRequest(DefaultContextInformationLoader.java:98)
es.logista.storefront.filters.cms.CMSSiteFilter.processNormalRequest(CMSSiteFilter.java:161)
es.logista.storefront.filters.cms.CMSSiteFilter.doFilterInternal(CMSSiteFilter.java:97)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
es.logista.storefront.filters.RequestLoggerFilter.doFilter(RequestLoggerFilter.java:89)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
es.logista.storefront.filters.AcceleratorAddOnFilter.doFilter(AcceleratorAddOnFilter.java:92)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
de.hybris.platform.servicelayer.web.SessionFilter.doFilter(SessionFilter.java:73)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
de.hybris.platform.servicelayer.web.Log4JFilter.doFilter(Log4JFilter.java:47)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain$InternalFilterChain.doFilter(AbstractPlatformFilterChain.java:226)
de.hybris.platform.servicelayer.web.AbstractPlatformFilterChain.doFilterInternal(AbstractPlatformFilterChain.java:156)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
es.logista.storefront.filters.AcceleratorAddOnFilter.doFilter(AcceleratorAddOnFilter.java:92)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
de.hybris.platform.servicelayer.web.XSSFilter.doFilter(XSSFilter.java:230)
nota La traza completa de la causa de este error se encuentra en los archivos de diario de Apache Tomcat/7.0.59.
最佳答案
嵌套异常是包裹在另一个异常中的异常。人们这样做是出于多种原因（其中有些人提到了here）。
如您在堆栈跟踪中所见，root exception是nullpointer exception。
因此，基本上，您的NestedServletException只是一个NullpointerException，它在某个时刻被再次捕获并抛出，但包裹在ServletException中。