tomcat开启后过一段时间CPU占用高达60-70%。
百度了一下，很多人都说在JavaStack查看，下面是jstack里面占用高的几个线程信息

"ajp-nio-8009-ClientPoller-1" #55 daemon prio=5 os_prio=0 tid=0x000000001e51d000 nid=0x93e4 runnable [0x0000000028ade000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
    at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
    at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    - locked <0x00000000934c46b0> (a sun.nio.ch.Util$2)
    - locked <0x00000000934c46a0> (a java.util.Collections$UnmodifiableSet)
    - locked <0x00000000934c4530> (a sun.nio.ch.WindowsSelectorImpl)
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:710)
    at java.lang.Thread.run(Thread.java:745)

   Locked ownable synchronizers:
    - None
"NioBlockingSelector.BlockPoller-2" #16 daemon prio=5 os_prio=0 tid=0x000000001bdbe000 nid=0xa124 runnable [0x000000001d8df000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
    at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
    at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
    at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    - locked <0x000000009192fb18> (a sun.nio.ch.Util$2)
    - locked <0x000000009192fb08> (a java.util.Collections$UnmodifiableSet)
    - locked <0x000000009192f9a8> (a sun.nio.ch.WindowsSelectorImpl)
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:298)

   Locked ownable synchronizers:
    - None

别人找到的都是自己代码里的类，通过分析异常信息，找出死锁代码，但是我这个 at 的都是jar包里的类，怎么分析啊，各位？