[root@localhost bin]# top

top - 07:01:38 up 19:03,  2 users,  load average: 1.10, 1.10, 1.04
Tasks: 168 total,   1 running, 167 sleeping,   0 stopped,   0 zombie
Cpu(s): 11.9%us,  1.9%sy,  0.0%ni, 85.6%id,  0.5%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:  16282908k total,  4298384k used, 11984524k free,   205972k buffers
Swap:  8208376k total,        0k used,  8208376k free,   719380k cached
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND        
28857 root      20   0 6286m 836m  11m S 106.9  5.3 396:27.97 java          
    1 root      20   0 19228 1516 1224 S  0.0  0.0   0:02.51 init           
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.01 kthreadd       
    3 root      RT   0     0    0    0 S  0.0  0.0   0:00.02 migration/0   

[root@localhost ~]# top -H -p 28857
top - 07:08:02 up 19:10, 2 users, load average: 1.08, 1.08, 1.04  
Tasks: 26 total, 1 running, 25 sleeping, 0 stopped, 0 zombie  
Cpu(s): 12.0% us, 1.9% sy, 0.0% ni, 85.5% id, 0.5% wa, 0.0% hi, 0.1% si, 0.0% st  
Mem: 16282908k total, 4297380k used, 11985528k free, 206304k buffers  
  PID USER PR NI VIRT RES SHR S %CPU%MEM TIME+ COMMAND 
 28871 root 20 0 6286m 836m 11m R 101.8 5.3 365:20.04 java 
 7749 root 20 0 6286m 836m 11m S 6.0 5.3 3:12.11 java 
 28857 root 20 0 6286m 836m 11m S 0.0 5.3 0:00.00 java 
 28858 root 20 0 6286m 836m 11m S 0.0 5.3 0:02.52 java 
 28859 root 20 0 6286m 836m 11m S 0.0 5.3 0:41.45 java 

[root@localhost ~]# jstack 28857 > a.txt
从打印出来的堆栈信息文件（a.txt）里，找到该进程（28871）信息：
Thread 28871: (state = IN_NATIVE)
 - sun.nio.ch.ServerSocketChannelImpl.accept0(java.io.FileDescriptor, java.io.FileDescriptor, java.net.InetSocketAddress[])@bci=0 (Compiled frame; information may be imprecise)
 - sun.nio.ch.ServerSocketChannelImpl.accept() @bci=130, line=226 (Compiled frame)
 - org.eclipse.jetty.server.nio.SelectChannelConnector.accept(int) @bci=20, line=97 (Compiled frame)
 - org.eclipse.jetty.server.AbstractConnector$Acceptor.run() @bci=153, line=833 (Compiled frame)
 - org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(java.lang.Runnable) @bci=1, line=598 (Interpreted frame)
 - org.eclipse.jetty.util.thread.QueuedThreadPool$3.run() @bci=47, line=533 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=722 (Interpreted frame)
看样子，跟这个BUG（http://jira.codehaus.org/browse/JETTY-937）很类似！
下载一个新版本（9.1.2）的jetty（http://download.eclipse.org/jetty/）就好了！

详见：http://blog.csdn.net/sanshiqiduer/article/details/1933625