title: eclipse annotation processor not working. Where are errors shown?
body: <p>Although there are other answers that cover this in some way, I want to have it for someone else that has similar problem and does notice the solution.</p>
  
  <p>After setting up my own annotation processor and it properly working via maven, I got annoyed by being forced to rebuild source with maven on each change that needs the processor to do some magic.</p>
  
  <p>Setting up eclipse to use my annotation processor required me to close annotation processor project so m2e-apt can put processor jars into .factorypath .</p>
  
  <p>But then it stopped working for some reason, and I could not find the reason,</p>