Eclipse Auto-Compile fail----workaround

Questions: During development, it is sometimes suddenly discovered that the modified code did not take effect after the Web container was started. The most likely cause is a few checksum errors, as shown in:

Workaround:

Window----I'm here for some unrecognized tags in XML, such as Preferences off. (Specific problem specific analysis)

Situation One:

Situation Two:

The original reference Lib package may not be used, deleted, but the build path inside the reference, will be reported to find Lib error.

Really do not use Lib can be as the same as ignoring the check, if it is necessary lib replacement under the path.

The above is the original can automatically compile, and then can not automatically compile the situation. Of course, it is possible to start with automatic compilation, then adjust the following configuration:

Eclipse Auto-Compile fail----workaround