Bootstrap properties initialize the runtime environment for a particular server. Generally, they are attributes that affect the configuration and initialization of the runtime core.
Bootstrap properties are set in a text file named bootstrap.properties. This
file is not required, so it does not exist unless you create it. You must create this file in the
server directory, which also contains the configuration root file server.xml.
By default, the server directory is usr/servers/server_name.
You can change the server directory as described in Customizing the Liberty profile environment.
If you update the bootstrap.properties file, you must restart the server for the changes to take effect.