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This installs the current Ubuntu-supported version (e.g., OpenJDK 11, 17, or 21). sudo apt install default-jdk Use code with caution. Copied to clipboard

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Save and exit ( Ctrl+O , Enter , Ctrl+X ), then apply the changes: source ~/.bashrc Use code with caution. How to Use jstack on Ubuntu

2345: Unable to open socket file: target process not responding or HotSpot VM not loaded

You only have the JRE installed, or your environment variables are misconfigured.

sudo find /usr -name jstack

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