The import javax.servlet cannot be resolved solution appears　　
The method provided on the Internet is, in Eclipse, right-click the project, select Build Path->configure build path->Libraries->Add External JARs, find the decompression path of tomcat on your computer, and select “servlet-api” under the lib folder .jar”, add and click “OK”
Description Resource Path Location Type Java compiler level does not match the version of the insta
Right-click Properties-“Project Facets on the project, and select the corresponding version in the Java drop-down list on the opened Project Facets page.
It may be java1.6 changed to java6 or something
Could not find HttpServlet
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