Eclipse cannot compile the solution automatically

Some time ago, Eclipse did not automatically compile the Java file problem, on the internet for a long time, finally solved the problem, now the solution to the problem summed up. 1, take a look at project-build automatically. If not, on the hook, clean up, restart Eclipse 2, and see if there are any unused jar packs in your lib, look at your. classpath file for the wrong path . 3, this is the most important point, there are problems views to see if there are any error messages about this item, generally there will be: The project cannot is built until build path errors are and then the following prompts U Nbound classpath, generally in. classpath delete these path. Of course, different error messages take different approaches.