When developing Java-class projects using Eclipse, it is unavoidable to build the same project on different devices, then the Java compiler level does not match the version of the installed Java Pro ject facet problem, meaning that the Java compiler is not the same as the project. So here's how to deal with this problem.
Processing method:
The first step:
Project Mail---->properties---->java Compiler, then follow the action and apply or OK.
Step Two:
Under. Setting, modify the Org.eclipse.wst.common.project.facet.core.xml file to change this to the JDK version we used,
Step Three:
Project Right-click---->properties---->project Facets, modify Java parameters, here to select the JDK version used in the project.
With these changes, the problem is solved.
New Import project appears Java compiler level does not match the version of the installed Java project facet problem processing