export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 export PATH=$PATH:$JAVA_HOME/bin Use code with caution. Summary of Packages sudo apt install default-jdk Specific Java sudo apt install openjdk- -jdk No GUI/Server sudo apt install openjdk- -jdk-headless
ps aux | grep java
Before you can use jstack , you need the PID of your target Java application. There are several ways to do this, with jps being the most direct. install jstack on ubuntu
Re-run the installation steps using the full -jdk package variant instead of -jre .
sudo apt install openjdk-8-jdk
In JDK 8 and later, Oracle recommends using jcmd as a more modern alternative with reduced performance overhead.
For more detailed information including lock information, use the -l flag: Re-run the installation steps using the full -jdk
jstack 12345
jstack is a command-line utility that comes bundled with the Java Development Kit (JDK). It is used to print Java stack traces of Java threads for a specified Java process. This tool is invaluable for developers and system administrators who need to debug applications, diagnose deadlocks, or identify performance bottlenecks (CPU spikes). It is used to print Java stack traces