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my centos Server is running the Spring boot application. I am trying to take threaddump of java process. But I cannot find jstack utility on the server. I figured out someone just installed the jre and did not install jdk, that may be the reason why jstack is missing.

Can you please let me know how can I install jstack on this server? is there any pre-install checks ? or does it involve any downtime ?

Aman35
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  • On Unix you can get a threaddump (on JVM's stdout) with `kill -3|-QUIT pid`; see https://stackoverflow.com/questions/16899565 https://stackoverflow.com/questions/4876274 . Otherwise yes `jstack` is in JDK; if you are using CentOS-supplied packages add the java-version-devel package matching your java-version package, otherwise be more specific about how your JRE was installed. – dave_thompson_085 May 03 '22 at 00:07
  • @dave_thompson_085 Thank you. Java -version openjdk version "1.8.0_272" OpenJDK Runtime Environment (build 1.8.0_272-b10) OpenJDK 64-Bit Server VM (build 25.272-b10, mixed mode) if you are using CentOS-supplied packages add the java-version-devel package matching your java-version package? can you please let me know How to verify this.. – Aman35 May 03 '22 at 15:30
  • Comments can't be properly formatted and are _not_ permanent, so you should put additional info _in the question_ using the edit button. However, the java _version_ tells nothing useful about how it was installed, which is what I asked about. Do `yum provides $(which java)` to find out what package, if any, it was installed from. If not, find out what file(s) you are running and where it/they came from. – dave_thompson_085 May 04 '22 at 06:20
  • Hi @dave_thompson_085, Thank you so much for your help. I was able to take a take threaddump using triggers in JDK mission control utility. – Aman35 May 16 '22 at 22:29

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