Install Jstack On Ubuntu [hot] -

To save the output to a file for later analysis:

Before proceeding with an installation, it's wise to check your current system state. jstack may already be available if you have a full JDK installed.

Usually, the OpenJDK installs in /usr/lib/jvm/ . You can verify exactly where your default JDK is installed by running: readlink -f /usr/bin/java Use code with caution. install jstack on ubuntu

jstack [options] <pid>

Run this command to choose your active Java installation interactively: sudo update-alternatives --config java Use code with caution. To save the output to a file for

: Run jstack with the -version option. A successful output will confirm the command is available.

First, find the PID of the misbehaving Java process (e.g., 12345 ). Then, find the internal thread ID that is consuming high CPU by running top -H -p 12345 . Convert that thread's decimal ID to hexadecimal. You can then grep for that hex value in your jstack output to see exactly what that specific thread is doing. Troubleshooting: "Well-known file is not secure" You can verify exactly where your default JDK

To use jstack , you need the Process ID (PID) of the Java application you want to inspect. You can use jps (Java Virtual Machine Process Status Tool), which is installed alongside jstack : jps -l Use code with caution.

which jstack