if change css, need restart the server?

my css is placed in structure like
public
   my.css
client
   xxx.java
shared
  xyz.java
server
  zzz.java

I try to modify the css and then close the development mode and restart it, but the css effect is still not seen. Everytime I change css, I need restart server, is this a easier way to modify css and see the effect without restart the server?

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