问题：项目里，用户有操作的情况下，半小时就自己退出系统，需要重新登录。。
在security的配置文件里，我就找到这个XML有配置时间的。。
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to Jasig under one or more contributor license
agreements. See the NOTICE file distributed with this work
for additional information regarding copyright ownership.
Jasig licenses this file to you under the Apache License,
Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a
copy of the License at the following location:
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:c="http://www.springframework.org/schema/c" xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<description>
Assignment of expiration policies for the different tickets generated by CAS including ticket granting ticket
(TGT), service ticket (ST), proxy granting ticket (PGT), and proxy ticket (PT).
These expiration policies determine how long the ticket they are assigned to can be used and even how often they
can be used before becoming expired / invalid.
</description>
<!-- Expiration policies -->
<util:constant id="SECONDS" static-field="java.util.concurrent.TimeUnit.SECONDS"/>
<bean id="serviceTicketExpirationPolicy" class="org.jasig.cas.ticket.support.MultiTimeUseOrTimeoutExpirationPolicy"
c:numberOfUses="1" c:timeToKill="${st.timeToKillInSeconds:30}" c:timeUnit-ref="SECONDS"/>
<!-- TicketGrantingTicketExpirationPolicy: Default as of 3.5 -->
<!-- Provides both idle and hard timeouts, for instance 2 hour sliding window with an 8 hour max lifetime -->
<bean id="grantingTicketExpirationPolicy" class="org.jasig.cas.ticket.support.TicketGrantingTicketExpirationPolicy"
p:maxTimeToLiveInSeconds="${tgt.maxTimeToLiveInSeconds:28800}"
p:timeToKillInSeconds="${tgt.timeToKillInSeconds:1800}"/>
</beans>
请问下，怎么修改，才能在用户有操作的时候，不要半小时退出！！！
------解决方案--------------------
这是session过期吧？
项目里，用户有操作的情况下，---->这里的操作是指和服务器有交互吗？