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java.lang.NullPointerException: null at org.springframework.data.rest.webmvc.support.ETag.getVersionInformation(ETag.java:192)[spring-data-rest-webmvc-2.4.1.RELEASE.jar:na] at org.springframework.data.rest.webmvc.support.ETag.from(ETag.java:76)[spring-data-rest-webmvc-2.4.1.RELEASE.jar:na] at org.springframework.data.rest.webmvc.support.ETag.verify(ETag.java:94)[spring-data-rest-webmvc-2.4.1.RELEASE.jar:na] at org.springframework.data.rest.webmvc.RepositoryEntityController.putItemResource(RepositoryEntityController.java:410)[spring-data-rest-webmvc-2.4.1.RELEASE.jar:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_45] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_45] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_45] at java.lang.reflect.Method.invoke(Method.java:497)[na:1.8.0_45] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)[spring-web-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)[spring-web-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:969)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:882)[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE]