Answers for "boolean java.lang.String.equals(java.lang.Object)' on a null object reference"

remove apache2 from ubuntu

#stop the apache2 service 
$ sudo systemctl stop apache2 

#remove apache2 packages
$ sudo apt-get purge apache2 apache2-utils apache2-bin apache2.2-common

# cleanup
$ sudo apt-get autoremove

# check if the apache has been removed:
#1- following command line should return a blank line
$ which apache2   
# 2- following command line should return apache2: Failed to start apache2.service: Unit apache2.service not found.
$ sudo systemctl start apache2

uninstall apache2 ubuntu

#How to completely remove Apache2 on Ubuntu 20.04 and similar distributions.

#stop the apache2 service 
$ sudo systemctl stop apache2 

#remove apache2 packages
$ sudo apt-get purge apache2 apache2-utils apache2-bin apache2.2-common

# cleanup
$ sudo apt-get autoremove

# check if the apache has been removed:
#1- following command line should return a blank line
$ which apache2   

# 2- following command line should return apache2: Failed to start apache2.service: Unit apache2.service not found.
$ sudo systemctl start apache2  

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boolean java.lang.String.equals(java.lang.Object)' on a null object reference

if (called_from != null && called_from.equalsIgnoreCase("add")) {