Resolves an issue in eclipse that appears in the resource is out of sync with the file system

When searching in eclipse, sometimes the error dialog box pops up after the search, and the error excerpt is as follows:
Resource is out of sync with the file system ...

Analysis:
Sometimes because of the urgency of the reason, so did not go to it, today again encountered it, really looked uncomfortable, so think of ways to solve the problem.

This problem is due to the fact that Eclipse Chinese is not in sync. In Eclipse, the project files are added by Eclipse Auto-Scan, and if the files in the project directory are modified externally and the auto-refresh feature is turned off, the file will be out of sync, resulting in a search that occurs resource System issues (Other features may also be the case). In addition, it is possible that the issue may be caused by an external failure to modify files in the Eclipse project.

Workaround:
There are two ways to resolve this:
1) Manual Refresh. That is, in the project catalog of Eclipse, right-click Refresh (or press F5).
2) To configure Eclipse options:
A) When Eclipse starts, refresh workspace, tick: Window->preferences->general->startup and Shutdown->refresh workspace on Startup
b) Window->preferences->general->workspace: Tick the option: Refresh using native hooks or polling and refresh on access;