After you load up your demo app, run JPS and note the returned vmid.
加载演示应用程序后，运行jps并注意返回的vmid。
Running jstack with the VMID of the desired process will generate a stack dump.
采用期望进程的 VMID 运行 jstack 会产生一个堆转储。
The "VMID" identifier is not always the same as the native operating system process identifier ("pid"), which is why we need the JDK's jps utility.
“VMID” 识别器与本地操作系统进程识别器（“pid”）并不总是相同的，这就是我们需要 JDK jps 实用程序的原因。
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