Caused by: java.lang.StackOverflowError at org.springframework.util.ObjectUtils.nullSafeEquals(ObjectUtils.java:246)

The exceptions are follow. It looked like a endless loop. Why?Can you tell me?

org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.StackOverflowError at org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletionWithError(DispatcherServlet.java:1287) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:120) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:97) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:109) at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:150) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:89) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:89) at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:156) at com.caucho.server.webapp.AccessLogFilterChain.doFilter(AccessLogFilterChain.java:95) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:289) at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:838) at com.caucho.network.listen.TcpSocketLink.dispatchRequest(TcpSocketLink.java:1346) at com.caucho.network.listen.TcpSocketLink.handleRequest(TcpSocketLink.java:1302) at com.caucho.network.listen.TcpSocketLink.handleRequestsImpl(TcpSocketLink.java:1286) at com.caucho.network.listen.TcpSocketLink.handleRequests(TcpSocketLink.java:1194) at com.caucho.network.listen.TcpSocketLink.handleAcceptTaskImpl(TcpSocketLink.java:993) at com.caucho.network.listen.ConnectionTask.runThread(ConnectionTask.java:117) at com.caucho.network.listen.ConnectionTask.run(ConnectionTask.java:93) at com.caucho.network.listen.SocketLinkThreadLauncher.handleTasks(SocketLinkThreadLauncher.java:169) at com.caucho.network.listen.TcpSocketAcceptThread.run(TcpSocketAcceptThread.java:61) at com.caucho.env.thread2.ResinThread2.runTasks(ResinThread2.java:173) at com.caucho.env.thread2.ResinThread2.run(ResinThread2.java:118) Caused by: java.lang.StackOverflowError at java.util.Arrays.equals(Arrays.java:2392) at sun.reflect.generics.reflectiveObjects.WildcardTypeImpl.equals(WildcardTypeImpl.java:200) at org.springframework.util.ObjectUtils.nullSafeEquals(ObjectUtils.java:246) at org.springframework.core.ResolvableType.equals(ResolvableType.java:803) at org.springframework.util.ConcurrentReferenceHashMap$Segment.findInChain(ConcurrentReferenceHashMap.java:591) at org.springframework.util.ConcurrentReferenceHashMap$Segment.getReference(ConcurrentReferenceHashMap.java:457) at org.springframework.util.ConcurrentReferenceHashMap.getReference(ConcurrentReferenceHashMap.java:247) at org.springframework.util.ConcurrentReferenceHashMap.get(ConcurrentReferenceHashMap.java:226) at org.springframework.core.ResolvableType.forType(ResolvableType.java:1207) at org.springframework.core.ResolvableType.forType(ResolvableType.java:1177) at org.springframework.core.GenericTypeResolver.resolveType(GenericTypeResolver.java:262) at org.springframework.data.util.TypeDiscoverer.resolveType(TypeDiscoverer.java:140) at org.springframework.data.util.TypeDiscoverer.createInfo(TypeDiscoverer.java:97) at org.springframework.data.util.ParentTypeAwareTypeInformation.createInfo(ParentTypeAwareTypeInformation.java:70) at org.springframework.data.util.ParameterizedTypeInformation.isResolvedCompletely(ParameterizedTypeInformation.java:207) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentINFO : com.cat.controller.avtivity.ActivityController - log-timeactInfo0319 002:25749 TypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) [15-03-30 14:36:28.030] at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98) at org.springframework.data.util.ParameterizedTypeInformation.hashCode(ParameterizedTypeInformation.java:183) at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:330) at org.springframework.data.util.ParentTypeAwareTypeInformation.hashCode(ParentTypeAwareTypeInformation.java:98)