Type Java compiler level does not match the version of the installed Java project facet. Project content Yes, but the project is wrong, and it doesn't affect the operation.

1, Window->show View->problems

2. On the project right-click Properties->project facets-> Modify the version on the right to remain consistent

3. Window->preferences->java->compiler-> set Compiler compliance level to the right

4, window->preferences->java->installed jres-> set or select the right installed JREs

5, the above three JDK version to be consistent, in order to compile through

6, in addition, the general new import project needs to set up the encoding format, such as:

7. Modify the encoding format of the JSP

Type Java compiler level does not match the version of the installed Java project facet. Project content Yes, but the project is wrong, and it doesn't affect the operation.