启动tomcat时报：
ERROR http-8080-Processor137 org.apache.tomcat.util.threads.ThreadPool - All threads (150) are currently busy, waiting. Increase maxThreads (150) or check th
e servlet status
和下面的警告：
INFO main org.apache.catalina.startup.Catalina - Server startup in 10861 ms
WARN ContainerBackgroundProcessor[StandardEngine[Catalina]] org.apache.catalina.core.ContainerBase - Exception processing manager org.apache.catalina.session
.StandardManager@179eb55 background process
java.lang.IllegalStateException: getAttribute: Session already invalidated
at org.apache.catalina.session.StandardSession.getAttribute(StandardSession.java:1021)
at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:110)
at com.nine.util.HttpSessionBinding.valueUnbound(HttpSessionBinding.java:35)
at org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1625)
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:749)
at org.apache.catalina.session.StandardSession.isValid(StandardSession.java:581)
at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:679)
at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:664)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1285)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1570)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1559)
at java.lang.Thread.run(Thread.java:595)
启动以后，访问数据库延时严重？？？？有谁遇到这么奇怪的问题啊，很严重的问题！
