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java.lang.NullPointerException: null	at org.springframework.data.rest.webmvc.support.ETag.getVersionInformation(ETag.java:192)	at org.springframework.data.rest.webmvc.support.ETag.from(ETag.java:76)	at org.springframework.data.rest.webmvc.support.ETag.verify(ETag.java:94)	at org.springframework.data.rest.webmvc.RepositoryEntityController.putItemResource(RepositoryEntityController.java:410)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:969)	at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:882)