tomcat使用redis來共享session，建立叢集。

出現錯誤，錯誤位置在是tomcat-redis-session-manager-1.2-tomcat-7.jar包中

按理Tomcat用不到自定義的類

把叢集裡面的Tomcat停掉，然後清楚Tomcat使用的redis的所有快取，再次啟動tomcat，然後訪問系統，就沒有這個問題了。

六月 21, 2017 4:42:57 下午 com.radiadesign.catalina.session.RedisSessionManager loadSessionFromRedis
嚴重: Unable to deserialize into session
java.lang.ClassNotFoundException: com.****.mysql.pojo.Department
        at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
        at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at org.apache.catalina.util.CustomObjectInputStream.resolveClass(CustomObjectInputStream.java:151)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1826)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2000)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
        at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1609)
        at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1075)
        at com.radiadesign.catalina.session.JavaSerializer.deserializeInto(JavaSerializer.java:40)
        at com.radiadesign.catalina.session.RedisSessionManager.loadSessionFromRedis(RedisSessionManager.java:403)
        at com.radiadesign.catalina.session.RedisSessionManager.findSession(RedisSessionManager.java:325)
        at org.apache.catalina.connector.Request.doGetSession(Request.java:3048)
        at org.apache.catalina.connector.Request.getSessionInternal(Request.java:2662)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:467)
        at com.radiadesign.catalina.session.RedisSessionHandlerValve.invoke(RedisSessionHandlerValve.java:26)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2549)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2538)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)