JSTACK(1)

📦 version 25.0.5.0.3.u1, in arch rolling

💅 JSTACK(1) — like, the jstack page from the JDK Commands manual, bestie

okay so we're doing the jstack page today and honestly it's giving ✨debugging era✨ — it's a JDK Commands manpage, part of the whole JDK manual set, and it lives at JSTACK(1). let's get into it 🫶

🎀 NAME 🎀

jstack — prints Java stack traces of Java threads for a specified Java process. that's the whole vibe. no cap 💖

🌸 SYNOPSIS 🌸

jstack [options] pid
⚠️ heads up bestie: this command is experimental and unsupported. like, it's literally stated right there in the synopsis. iykyk 😭

so here's what the pieces are:

  • options — this represents the jstack command-line options. see Options for the jstack Command below, i promise they're short 🌈
  • pid — the process ID for which the stack trace is printed. and listen: the process must be a Java process. to get a list of Java processes running on a machine, use either the ps command or — and this is the important caveat — if the JVM processes are not running in a separate docker instance — the jps command. lowkey a whole mood 💅

🦋 DESCRIPTION 🦋

so the jstack command prints Java stack traces of Java threads for a specified Java process. fr fr, that's the job.

for each Java frame, it prints:

  • the full class name
  • the method name
  • the byte code index (BCI)
  • the line number, when available

also, real talk: C++ mangled names aren't demangled. 🙈 if you want demangled C++ names, you can pipe the output of this command to c++filt. that's the move.

and when the specified process is running on a 64-bit JVM, you might need to specify the -J-d64 option, for example:

jstack -J-d64 pid

✨ easy ✨

⚠️ Note, and this one matters: this command is unsupported and might not be available in future releases of the JDK. so like, don't build your whole personality on it 💀 in Windows Systems where the dbgeng.dll file isn't present, the Debugging Tools for Windows must be installed so that these tools work. and the PATH environment variable needs to contain the location of the jvm.dll that is used by the target process, or the location from which the core dump file was produced. yeah, i know. read it twice, queen 👑

👑 OPTIONS FOR THE JSTACK COMMAND 👑

okay literally only two (well, two-ish) options, we ate:

  • -l — the long listing option prints additional information about locks. that's it, that's the whole flag 🎀
  • -h or -help — prints a help message. iconic. the classic. she never misses 💖

and that's the page, bestie!! no crumbs left, every flag accounted for, slay 🧚‍♀️

🦋 cute little sign-off: this is from JDK 25.0.5.0.3, dated 2026, and it's page JSTACK(1) of the JDK Commands manual. periodt. 💜

📦 where this page comes from