Eclipse autocomplete not working in some Java files

Question

I have noticed that autocomplete is not working in some of java files in Eclipse. Also, the files where autocomplete is not working, display a hollow \"J\" as the icon for t

Answer 1

I cope with the issue by deleting the file if autocomplete does not work. Just before copying the source code. Then I have recreated the java file with the same name. Pasted the source code previously copied.