一次http流未关闭引发的血案(jvm排查)

同事弄了一个定时任务，定期去请求一些数据来，定时任务交由线程池管理，http连接由连接池维护分配

//允许异步执行  Schedule
@EnableAsync
@Component
public class TestSchedule {
    private static final Logger LOGGER = LoggerFactory.getLogger(LotterySchedule.class);

    // 使用线程池myAsync来执行这个Job
    @Async("myAsync")
    @Scheduled(cron = "0/1 * * * * ?")
    public void testDoGet(){
        LOGGER.info("\ntestDoGet:"+Thread.currentThread());
	//业务代码:类似下边拿数据后处理
	HttpUtil.doGet("www.baidu.com")
    }

}

发现一段时间后定时任务就停了，但是jvm还活着，其他业务也没事，

猜测肯定是线程阻塞了，jps 命令找到进程号，之后jstack -l 进程号  看了一下jvm线程状况

"MyJobExecutor-2" #25 prio=5 os_prio=31 tid=0x00007fc7f7374800 nid=0xa203 waiting on condition [0x0000700004def000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x0000000742196c58> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
        at org.apache.http.pool.AbstractConnPool.getPoolEntryBlocking(AbstractConnPool.java:380)
        at org.apache.http.pool.AbstractConnPool.access$200(AbstractConnPool.java:69)
        at org.apache.http.pool.AbstractConnPool$2.get(AbstractConnPool.java:246)
        - locked <0x00000007969b6910> (a org.apache.http.pool.AbstractConnPool$2)
        at org.apache.http.pool.AbstractConnPool$2.get(AbstractConnPool.java:193)
        at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.leaseConnection(PoolingHttpClientConnectionManager.java:303)
        at org.apache.http.impl.conn.PoolingHttpClientConnectionMan