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This exception has no message.
java.lang.NullPointerException: 	at java.io.StringReader.(StringReader.java:33)	at org.codehaus.jackson.JsonFactory.createJsonParser(JsonFactory.java:636)	at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1863)	at org.springframework.data.rest.webmvc.RepositoryRestController.query(RepositoryRestController.java:418)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:643)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:450)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1067)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:377)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1001)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)	at org.eclipse.jetty.server.Server.handle(Server.java:360)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:622)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)	at java.lang.Thread.run(Thread.java:680)