Eclipse Problems View doesn't show Errors

Question

[Note: There is another thread about this problem but it did not answer the question.]

For one specific project in Eclipse, the problems view does not show errors. I

Answer 1

I had the problem where in the red cross icon by the file name did not appear. I tried all possibilities described on this question. However, the root cause in my case was, I deleted a jar file from SVN. So the java file using the imports from this jar had errors. Surprisingly that didn't show up.

Looking at the build path, I found under Java Build Path -> Libraries -> jar (missing). Having removed it from the build path, the red icon next to the file showed up !! Excruciating it was to find this error and wasting so much time, I wonder why this icon does not show up nor does Problem view report it.