jstack：目标进程没有响应 [英] jstack: Target process not responding

问题描述

我正在运行Ubuntu服务器版本，我想采用Tomcat的线程转储。

I am running Ubuntu server edition and I wanted to take a thread dump of Tomcat.

所以，我首先尝试找出哪个PID tomcat使用：

So, I first tried to find out which PID tomcat uses:

$ jps -l
5809 sun.tools.jps.Jps

但它不存在？

所以，我用 top 而不是找到PID 5730。

So, I used top instead and found out the PID 5730.

然后我调用jstack来获取线程转储：

Then I called jstack to get the thread dump:

$ sudo jstack -l 5730
5730: Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not responding

发生了什么？ ： - （

What's going on? :-(

我已按照 Jstack和Jstat停止升级到JDK6u23 但这没有改变任何东西：

I already tried to export CATALINA_TMPDIR as described in Jstack and Jstat stopped working with upgrade to JDK6u23 but that didn't change anything:

$ export CATALINA_TMPDIR=/tmp
$ sudo /etc/init.d/tomcat6 restart
 * Stopping Tomcat servlet engine tomcat6
   ...done.
 * Starting Tomcat servlet engine tomcat6
   ...done.
$ sudo jstack -l 5934 // new PID after restart
5934: Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not responding

更新：

我也试过 sudo -u tomcat6 jstack -l -F 5730> threaddumpexceptions2.txt 但它只能在控制台上给我很多例外。

I also tried sudo -u tomcat6 jstack -l -F 5730 > threaddumpexceptions2.txt but it only gives me tons of exceptions on the console.

推荐答案

我通过做两件事来实现它：

I got it working by doing two things:

1. 将呼叫改为： sudo -u tomcat6 jstack -J-d64 -m pid


2. 用Sun的原始sun-6-jdk和sun-6-jre软件包替换OpenJDK

---

第1部分的说明：我切换到64位模式，使用 sudo 并以Tomcat用户身份运行该命令。

---

Explanation for part 1: I switched to 64-bit mode, used sudo and run the command as Tomcat user.

注意：第2部分可能没有必要。对于一些用户来说，似乎第1部分就足够了。实际上，首先尝试添加 sudo 命令。它可能已经成功了。

Note: Part 2 might not be necessary. For some users it seems like part 1 is enough. In fact, try to add just the sudo command first. It might already do the trick.

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