java中ServletContext的输出未按预期获得?
我试图从java中ServletContext的输出未按预期获得?,java,tomcat,servlets,Java,Tomcat,Servlets,我试图从web.xml文件中读取某些值,我得到了问题底部图像中的错误 Config.html <form action="go" method="get"> Enter name:<input type="text" name="pname"><br> Enter Age:<input type="text" name="page"><br> <input type="submit" value="subm
web.xml
文件中读取某些值,我得到了问题底部图像中的错误
Config.html
<form action="go" method="get">
Enter name:<input type="text" name="pname"><br>
Enter Age:<input type="text" name="page"><br>
<input type="submit" value="submit">
</form>
<servlet>
<description></description>
<display-name>UseServletContext</display-name>
<servlet-name>UseServletContext</servlet-name>
<servlet-class>UseServletContext</servlet-class>
</servlet>
<context-param>
<param-name>db2url</param-name>
<param-value>jdbc:db2://localhost:50000/mydb1235</param-value>
</context-param>
<context-param>
<param-name>db2user</param-name>
<param-value>piyush</param-value>
</context-param>
<servlet-name>UseServletContext</servlet-name>
<url-pattern>/go1</url-pattern>
</servlet-mapping>
我得到以下错误:
web.xml
<form action="go" method="get">
Enter name:<input type="text" name="pname"><br>
Enter Age:<input type="text" name="page"><br>
<input type="submit" value="submit">
</form>
<servlet>
<description></description>
<display-name>UseServletContext</display-name>
<servlet-name>UseServletContext</servlet-name>
<servlet-class>UseServletContext</servlet-class>
</servlet>
<context-param>
<param-name>db2url</param-name>
<param-value>jdbc:db2://localhost:50000/mydb1235</param-value>
</context-param>
<context-param>
<param-name>db2user</param-name>
<param-value>piyush</param-value>
</context-param>
<servlet-name>UseServletContext</servlet-name>
<url-pattern>/go1</url-pattern>
</servlet-mapping>
UseServletContext
UseServletContext
UseServletContext
db2url
jdbc:db2://localhost:50000/mydb1235
db2user
皮尤斯
UseServletContext
/go1
有人能告诉我我做错了什么吗?您在Servlet中重写了init方法了吗? 如果是,那么不要忘记调用
super.init(config)代码>如下所示
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
除了抛出了NullPointerException
之外,您的错误消息实际上没有指定任何特定的内容。但我确实看到,在您的web.xml
中有一个
结束标记,但在任何地方都没有
开始标记。