在STS中，突然把配置的Tomcat删除，换另外一个Tomcat使用时，出现：The import javax.servlet cannot be resolved。这个错误可能是服务器自带的servlet库未导入的原因。右键项目属性，转到Targeted Runtimes，选择一个服务器，例如Tomcat，单击应用，可能就可以解决。如图所示
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