javaMail收郵件報錯問題

最近在做javaMail收郵件時，報了這個錯誤，avax.mail.AuthenticationFailedException: The system was unable to log shaufmu in.  Maildrop opened for exclusive access by another user.
 at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:128)
 at javax.mail.Service.connect(Service.java:236)
 at javax.mail.Service.connect(Service.java:137)
 at javax.mail.Service.connect(Service.java:86)
 at email.MailReceive.getMailReceiveByMail(MailReceive.java:415)
 at com.ceair.apm.service.communication.impl.CommunicationServiceImpl.getMailReceiveByMail(CommunicationServiceImpl.java:115)
 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:310)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
 at $Proxy39.getMailReceiveByMail(Unknown Source)
 at com.ceair.apm.service.communication.impl.ReceiveEmailServiceImpl.saveReceiveEmail(ReceiveEmailServiceImpl.java:342)
 at com.ceair.apm.service.communication.impl.ReceiveEmailServiceImpl.addReceiveEmail(ReceiveEmailServiceImpl.java:330)
 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:310)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
 at $Proxy67.addReceiveEmail(Unknown Source)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:276)
 at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:260)
 at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
 at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
 at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)請問有遇到過的沒！！