Jsp空指针问题

qq_39208530 2017-10-22 10:08:40
Jsp主要代码
<form name="form" method="post">
学号:<input type="text" name="sno"/><br/>
姓名:<input type="text" name="name"/><br/>
性别:<input type="text" name="sex"/><br/>
年龄:<input type="text" name="age"/><br/>
<input type="submit" name="submit" value="提交"/>
</form>
<br/>
<br/>
<% request.setCharacterEncoding("UTF-8");
if(request.getParameter("submit").equals("提交")){%>
<jsp:useBean id="stu" class="com.zuu.Student">
<jsp:setProperty name="stu" property="*"/>
</jsp:useBean>
<table border="1">
<tr><td>学号</td><td>姓名</td><td>性别</td><td>年龄</td></tr>
<tr><td>
<%if(stu.getSno()!=null){
out.println(stu.getSno());
} %>
</td>
<td>
<% if(stu.getName()!=null){
out.println(stu.getName());
}%>
</td>
<td>
<% if(stu.getSex()!=null){
out.println(stu.getSex());
} %>
</td>
<td>
<% if(stu.getAge()!=0){
out.println(stu.getAge());
}
}%>
</td></tr>
</table>
错误
严重: Servlet.service() for servlet [jsp] in context with path [/Aproject] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at org.apache.jsp.MyJsp2_jsp._jspService(MyJsp2_jsp.java:103)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
...全文
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qq_39208530 2017-11-18
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刚才弄错了,不是故意丢板砖,问题已经解决了,谢谢
街头小贩 2017-10-24
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com.zuu.Student类的代码贴一下
usecf 2017-10-23
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(MyJsp2_jsp.java:103) 把你这个文件代码贴出来看看

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