my Servlet.Java
class MyServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
//private static final long serialVersionUID =102831973239L;
static String task;
public MyServlet(){
}
String tm;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
task = request.getParameter("task");
tm= request.getParameter("reminder_time");
try {
SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date time=new Date();
formatter.format(time);
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con =DriverManager.getConnection(
"jdbc:mysql://localhost:3306/reminder","sarthak","sar31thak");
String INSERT_RECORD = "insert into ToDo values(?, ?)";
PreparedStatement pstmt = null;
pstmt = con.prepareStatement(INSERT_RECORD);
pstmt.setString(1, task);
pstmt.setDate(2, (java.sql.Date) time);
int rs= pstmt.executeUpdate();
if(rs!=0){
response.sendRedirect("success.html");
return;
}
else{
response.sendRedirect("error.html");
}
con.close();
}
catch(Exception e){
System.out.println("Got an EXCEPTION");}
}
catch (Exception e) {
System.out.println("Got an ERROR");
}
}
网嗯
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Alert</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>MyServlet</display-name>
<servlet-name>MyServlet</servlet-name>
<servlet-class>com.sar.pkg.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/MyServlet</url-pattern>
</servlet-mapping>
</web-app>
这导致以下错误
HTTP状态500 - 实例化servlet类com.sar.pkg.MyServlet时出错
类型异常报告
message实例化servlet类com.sar.pkg.MyServlet时出错
description服务器遇到内部错误,导致无法完成此请求。
异常javax.servlet.ServletException:实例化servlet类的错误com.sar.pkg.MyServlet org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve。 java:100)org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)org.apache.coyote.http11.AbstractHttp11Processor。进程(AbstractHttp11Processor.java:1041)org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:603)org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:310)java。 util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)java.util.concurrent.ThreadPoolExecutor $ Worker.run(Unknown Source)java.lang.Thread.run(Unknown Source)
root cause java.lang.IllegalAccessException:类org.apache.catalina.core.DefaultInstanceManager无法使用修饰符“public”sun.reflect.Reflection.ensureMemberAccess(Unknown Source)java访问类com.sar.pkg.MyServlet的成员。 lang.Class.newInstance(Unknown Source)org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)org.apache.catalina .valves.AccessLogValve.invoke(AccessLogValve.java:953)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)org .apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:603)org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:310)java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown来源)java.util.concurrent.ThreadPoolExecutor $ Worker.run(未知来源)jav a.lang.Thread.run(未知来源)
note备注根本原因的完整堆栈跟踪在Apache Tomcat /7.0.47日志中。
我试图通过使用不同的serialVersionID来删除此错误,并在运行之前清理项目。仍然坚持这一点。请帮忙。提前致谢。
您的Servlet类com.sar.pkg.MyServlet
不公开。你的定义
class MyServlet extends HttpServlet{
应该
public class MyServlet extends HttpServlet{