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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.put(Unknown Source)	at org.hibernate.criterion.NaturalIdentifier.getNaturalIdValues(NaturalIdentifier.java:63)	at org.hibernate.internal.SessionImpl.tryNaturalIdLoadAccess(SessionImpl.java:1661)	at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1584)	at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374)	at org.hibernate.internal.CriteriaImpl.uniqueResult(CriteriaImpl.java:396)	at com.adidas.scv.framework.datalayer.HibernateDataAccessObject.naturalUniqueResult(HibernateDataAccessObject.java:316)	at com.adidas.scv.framework.service.ObjectPersistenceServiceProvider.getNaturalUniqueResult(ObjectPersistenceServiceProvider.java:246)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)	at com.sun.proxy.$Proxy37.getNaturalUniqueResult(Unknown Source)	at com.xxxx.scv.business.service.helpers.CommonHelper.getRecipientByMailId(CommonHelper.java:299)	at com.xxxx.scv.business.service.impl.AuthenticationServiceImpl.authenticate(AuthenticationServiceImpl.java:83)	at com.xxxx.scv.services.endpoints.AuthenticationEndPoint.authenticate(AuthenticationEndPoint.java:49)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.ws.server.endpoint.MethodEndpoint.invoke(MethodEndpoint.java:132)	at org.springframework.ws.server.endpoint.adapter.MarshallingMethodEndpointAdapter.invokeInternal(MarshallingMethodEndpointAdapter.java:140)	at org.springframework.ws.server.endpoint.adapter.AbstractMethodEndpointAdapter.invoke(AbstractMethodEndpointAdapter.java:53)	at org.springframework.ws.server.MessageDispatcher.dispatch(MessageDispatcher.java:233)	at org.springframework.ws.server.MessageDispatcher.receive(MessageDispatcher.java:173)	at org.springframework.ws.transport.support.WebServiceMessageReceiverObjectSupport.handleConnection(WebServiceMessageReceiverObjectSupport.java:88)	at org.springframework.ws.transport.http.WebServiceMessageReceiverHandlerAdapter.handle(WebServiceMessageReceiverHandlerAdapter.java:59)	at org.springframework.ws.transport.http.MessageDispatcherServlet.doService(MessageDispatcherServlet.java:221)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Unknown Source)