javax.servlet.jsp.JspException cannot be resolved to a type javax.servlet.jsp.PageContext cannot be

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javax.servlet.jsp.JspException cannot be resolved to a type javax.servlet.jsp.PageContext cannot be
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javax.servlet.jsp.JspException cannot be resolved to a type javax.servlet.jsp.PageContext cannot be
javax.servlet.jsp.JspException cannot be resolved to a type javax.servlet.jsp.PageContext cannot be

javax.servlet.jsp.JspException cannot be resolved to a type javax.servlet.jsp.PageContext cannot be
你有没有把 JSP的包配置到jdk/jre/lib/ext下?