Enable log messages in plantuml diagram

Using !log directive, we can add some log messages to the diagram. These log messages will be printed to the command line output stream.

log.txt

@startuml

title "User login flow"

start

!log Process started......

:User enter username and password;

if (credentials are correct) then (yes)
	: Take user to the home page;
else (no)
    : Take user to the login page and **display error message**;
endif

stop

!log Process stopped......

@enduml

 

Get the diagram from above file.

 

$java -jar plantuml.jar log.txt 
[Log] Process started......
[Log] Process stopped......

 

log.png

 

 

 

 

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