请问有人见过这个问题吗？我在Java 8 / SpringBoot 1.5.13 / Tomcat 8.5 Web应用程序中观察到运行时间极长的请求（> 30s）。而且卡顿时间会随程序运行时间变久。但是大部分请求的响应还是正常的。卡顿发生时的cpu负载增长到100%，过几分钟后会自己降下来。

Threaddumps显示Unsafe.defineClass正在挂起：

"http-nio-8080-exec-9" #254 daemon prio=5 os_prio=0 tid=0x00007f8a98b4f000 nid=0x2258 runnable [0x00007f89fb0b0000]
   java.lang.Thread.State: RUNNABLE
	at sun.misc.Unsafe.defineClass(Native Method)
	at sun.reflect.ClassDefiner.defineClass(ClassDefiner.java:63)
	at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:399)
	at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:394)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:393)
	at sun.reflect.MethodAccessorGenerator.generateMethod(MethodAccessorGenerator.java:75)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:53)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:618)
	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:538)
	at com.haigui.stateaction.action_impl.DisputeSubmit.insertDisputeInfo(DisputeSubmit.java:128)

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卡顿发生时的JVM情况：