spring-boot启动异常（sun.misc.Unsafe.

今天在项目启动的时候，出现以下异常，开始以为是内存空间不足引起，后面加大内存空间到5G，启动依然出现该错，使用Google和百度搜索后依然没有解决。

2019/07/29-20:28:06 [localhost-startStop-1] WARN  org.apache.catalina.loader.WebappClassLoaderBase - The web application [iot-ms] appears to have started a thread named [HikariPool-1 housekeeper] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
 java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 java.lang.Thread.run(Thread.java:748)
2019/07/29-20:28:06 [localhost-startStop-1] WARN  org.apache.catalina.loader.WebappClassLoaderBase - The web application [iot-ms] appears to have started a thread named [lettuce-eventExecutorLoop-2-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
 java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
 io.netty.util.concurrent.SingleThreadEventExecutor.takeTask(SingleThreadEventExecutor.java:251)
 io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:64)
 io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)
 io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 java.lang.Thread.run(Thread.java:748)

最后认真回想今天提交的代码，发现有一个DTO不是自己定义的，是使用的第三方包中的，怀疑是由PostDeviceCommandOutDTO2引起，于是把该方法注释后项目启动成功。

@ApiOperation(value = "查询",notes = "查询")
@RequestMapping(value = "commandCallback",method = RequestMethod.POST)
public @ResponseBody ResposeVO commandCallback(@RequestBody @Valid PostDeviceCommandOutDTO2 dto){
    System.out.println(dto);
    return ResponseFactory.ok("成功");
}

问题分析：

打开该DTO进入源码看到类中有一个com.fasterxml.jackson.databind.node.ObjectNode类型的属性，问题就是该属性引起swagger扫描属性循环引用造成。

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