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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926) at java.util.HashMap$KeyIterator.next(HashMap.java:960) at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1067) at org.springframework.data.repository.support.Repositories.getRepoInfoFor(Repositories.java:183) at org.springframework.data.repository.support.Repositories.getRepositoryInformationFor(Repositories.java:130) at org.springframework.data.repository.support.DomainClassConverter.matches(DomainClassConverter.java:86) at org.springframework.core.convert.support.GenericConversionService$ConvertersForPair.getConverter(GenericConversionService.java:617) at org.springframework.core.convert.support.GenericConversionService$Converters.getRegisteredConverter(GenericConversionService.java:523) at org.springframework.core.convert.support.GenericConversionService$Converters.find(GenericConversionService.java:507) at org.springframework.core.convert.support.GenericConversionService.getConverter(GenericConversionService.java:240) at org.springframework.core.convert.support.GenericConversionService.canConvert(GenericConversionService.java:135) at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:159) at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:93) at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:64) at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:47) at org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:582) at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:102) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:79) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:157) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:124) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)