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java.lang.IllegalArgumentException: name argument cannot be null or empty	at org.apache.commons.lang.Validate.notEmpty(Validate.java:363)	at com.atlassian.crowd.integration.directory.connector.SpringLDAPConnector.findUserByName(SpringLDAPConnector.java:424)	at com.atlassian.crowd.integration.directory.connector.SpringLDAPConnector.authenticate(SpringLDAPConnector.java:791)	at com.atlassian.crowd.manager.application.ApplicationServiceGeneric.authenticateUser(ApplicationServiceGeneric.java:190)	at com.atlassian.crowd.manager.application.ApplicationServiceGeneric.authenticateUser(ApplicationServiceGeneric.java:125)	at com.atlassian.crowd.manager.application.ApplicationServiceGeneric.authenticateUser(ApplicationServiceGeneric.java:208)	at sun.reflect.GeneratedMethodAccessor232.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:20)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy16.authenticateUser(Unknown Source)	at com.atlassian.crowd.service.soap.SecurityServerGeneric.authenticatePrincipal(SecurityServerGeneric.java:202)	at sun.reflect.GeneratedMethodAccessor204.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:20)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy19.authenticatePrincipal(Unknown Source)	at sun.reflect.GeneratedMethodAccessor204.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.codehaus.xfire.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:59)	at org.codehaus.xfire.service.binding.ServiceInvocationHandler.sendMessage(ServiceInvocationHandler.java:320)	at org.codehaus.xfire.service.binding.ServiceInvocationHandler$1.run(ServiceInvocationHandler.java:86)	at org.codehaus.xfire.service.binding.ServiceInvocationHandler.execute(ServiceInvocationHandler.java:134)	at org.codehaus.xfire.service.binding.ServiceInvocationHandler.invoke(ServiceInvocationHandler.java:109)	at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)	at org.codehaus.xfire.transport.DefaultEndpoint.onReceive(DefaultEndpoint.java:64)	at org.codehaus.xfire.transport.AbstractChannel.receive(AbstractChannel.java:38)	at org.codehaus.xfire.transport.http.XFireServletController.invoke(XFireServletController.java:304)	at org.codehaus.xfire.transport.http.XFireServletController.doService(XFireServletController.java:129)	at org.codehaus.xfire.transport.http.XFireServlet.doPost(XFireServlet.java:116)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at com.atlassian.johnson.filters.AbstractJohnsonFilter.doFilter(AbstractJohnsonFilter.java:72)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)	at com.atlassian.crowd.console.filter.CrowdOpenSessionInViewFilter.doFilterInternal(CrowdOpenSessionInViewFilter.java:26)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at com.atlassian.gzipfilter.GzipFilter.doFilterInternal(GzipFilter.java:81)	at com.atlassian.gzipfilter.GzipFilter.doFilter(GzipFilter.java:51)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:183)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)	at com.atlassian.crowd.console.filter.CrowdDelegatingFilterProxy.doFilter(CrowdDelegatingFilterProxy.java:38)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.valves.FastCommonAccessLogValve.invoke(FastCommonAccessLogValve.java:482)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)	at java.lang.Thread.run(Thread.java:619)