jstack 12345
jstack comes with several options that give you more control over the output:
But for most cases, installing the full JDK is simpler. install jstack on ubuntu
jstack must be executed by the exact same system user who started the Java process. If the Java app runs under a user named tomcat , run jstack like this: sudo -u tomcat jstack Use code with caution. Error: "ptrace_attach failed"
For most users, the simplest method is to install the Ubuntu default JDK package, which currently provides OpenJDK 21 on the latest LTS releases: sudo apt update Install the JDK: sudo apt install default-jdk jstack 12345 jstack comes with several options that
On many Ubuntu systems, running jstack on a Java process owned by another user (e.g., Tomcat, Jenkins) requires root privileges or that the user matches the process owner. If you get Operation not permitted , prepend sudo :
First, see if you already have a JDK installed by checking the version: javac -version Use code with caution. Copied to clipboard Error: "ptrace_attach failed" For most users, the simplest
sudo jstack <PID>
To use jstack , you need the Process ID (PID) of your running Java application. jps -l # or ps -ef | grep java Use code with caution. Run jstack: jstack Use code with caution. Save output to a file (for analysis): jstack -l > threaddump.txt Use code with caution. Troubleshooting: "jstack command not found"