Servlet学习记录2: java.lang.NullPointerException
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1.严重: Servlet.service() for servlet [jsp] in context with path [/GetDataServletDemo] threw exception [java.lang.NullPointerException] with root cause java.lang.NullPointerException
jsp 文件表单提交的地址错误,我们要提交到servlet类文件:action=“servlet包名/servlet类名”
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