老师您好，我在一次登录时报以下错，是redis连接被占完了吗，怎么会占完呢，它不会释放没用的连接吗，这怎么办呢，求解，谢谢老师。

redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool

at redis.clients.util.Pool.getResource(Pool.java:53) ~[jedis-2.6.0.jar:na]

at redis.clients.jedis.JedisPool.getResource(JedisPool.java:99) ~[jedis-2.6.0.jar:na]

at com.mmall.common.RedisPool.getJedis(RedisPool.java:42) ~[classes/:na]

at com.mmall.util.RedisPoolUtil.get(RedisPoolUtil.java:69) ~[classes/:na]

at com.mmall.controller.common.SessionExpireFilter.doFilter(SessionExpireFilter.java:32) [classes/:na]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.75]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.75]

at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-4.0.0.RELEASE.jar:4.0.0.RELEASE]

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108) [spring-web-4.0.0.RELEASE.jar:4.0.0.RELEASE]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.75]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.75]

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218) [catalina.jar:7.0.75]

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) [catalina.jar:7.0.75]

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506) [catalina.jar:7.0.75]

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) [catalina.jar:7.0.75]

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) [catalina.jar:7.0.75]

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962) [catalina.jar:7.0.75]

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) [catalina.jar:7.0.75]

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452) [catalina.jar:7.0.75]

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087) [tomcat-coyote.jar:7.0.75]

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) [tomcat-coyote.jar:7.0.75]

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) [tomcat-coyote.jar:7.0.75]

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_144]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_144]

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-coyote.jar:7.0.75]

at java.lang.Thread.run(Unknown Source) [na:1.8.0_144]

Caused by: java.util.NoSuchElementException: Unable to validate object

at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:497) ~[commons-pool2-2.0.jar:2.0]

at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:360) ~[commons-pool2-2.0.jar:2.0]

at redis.clients.util.Pool.getResource(Pool.java:51) ~[jedis-2.6.0.jar:na]

... 25 common frames omitted