Warning the selected directory is not a valid tomcat home

Problem:

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This happens because intellijIDEA doesn't have enough permission to read and write on the tomcat home folder, this happens on linux machines.

Solution

let your tomcat root folder = "/opt/tomcat" then this command which will set the right privilege level for intellijIDEA.

$ sudo chmod 755 -R /opt/tomcat

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If you are using IDEA on Linux platform, use the command:

chmod 755 -R apache-tomcat-<<Your-tomcat-version>>

Then try to restart your service again.

Try selecting the libexec subdirectory in IntelliJ - i.e. /usr/local/Cellar/tomcat/8.5.9/libexec

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