How to run while coding

Hello,

I am new to Languagetool and OSS in general and I was wondering is it necessary to rebuild the project after making any change, or is there a more efficient way to see if the change in the code works properly?

Which code do you want to change? If a rule in an XML file, then just restart. If a rule or anything else coded in Java, then, of course, you have to rebuild.

Yes, I was talking about Java code.
Thanks a lot for answering!