1.在出现此错误的项目上右键-->Build Path --> Configure Build Path
2.点击右边的 ADD Library
3.选中“Server Runtime”，然后 Next
4.选择"Apache Tomcat v8.5"，然后Finish
5.然后点击上面的“Order and Export”，选中“Apache Tomcat v8.5 [Apache Tomcat v8.5]”,点击“Apply”,最后点击“OK”
问题就解决了。
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