Java compiler level does not match the version of the installed Java project Facet Error resolution

As a result of the work, the eclipse-developed Java project was copied and sometimes reported a strange mistake. Clearly the source is exactly the same, why the project copied to another machine, it will be reported "Java compiler level does not match the version of the installed Java project facet" error?

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In fact, to solve is also very simple, under the Explorer, find the directory where the project, in the. Settings subdirectory, open the Org.eclipse.wst.common.project.facet.core.xml configuration file with a text editor ，：

　　

Modify the Red Draw line section to keep it consistent with the compiler version settings for the project.

To view the compiler version settings for your project, in the eclipse environment, right-click the project, tap Properties, select Java Compiler, and you can see the compiler version on the right side of the window:

　　

Java compiler level does not match the version of the installed Java project Facet Error resolution