myservlet.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");
}
}
web.xml
<?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>
导致以下错误
http状态500-错误实例化servlet类com.sar.pkg.myservlet
类型异常报告
消息错误实例化servlet类com.sar.pkg.myservlet
描述服务器遇到的内部错误,阻止其满足此请求。
例外javax.servlet.servletexception:错误实例化servlet类com.sar.pkg.myservlet org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:502) org.apache.catalina.Valves.ErreReportValve.Invoke(errorreeportvalve.java:100) org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:953) org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:408) org.apache.coyote.http11.abstracthtp11processor.process(apptracthttp11processor.java:1041) org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.Process(Abstract Protocol.java:603) org.apache.tomcat.util.net.jioendpoint $ socketProcessor.run(jioendpoint.java:310) java.util.concurrent.threadpoolexecutor.runworker(未知来源) java.util.concurrent.threadpoolexecutor $ worker.run(未知来源) java.lang.thread.run(未知来源)
根本原因java.lang.illegalaccessexception:org.apache.catalina.core.defaultinstancemanager无法访问带有修饰符" public"类的com.sar.pkg.myservlet的成员 Sun.Reflect.Reflection.shemememberaccess(未知来源) java.lang.class.newinstance(未知来源) org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:502) org.apache.catalina.Valves.ErreReportValve.Invoke(errorreeportvalve.java:100) org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:953) org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:408) org.apache.coyote.http11.abstracthtp11processor.process(apptracthttp11processor.java:1041) org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.Process(Abstract Protocol.java:603) org.apache.tomcat.util.net.jioendpoint $ socketProcessor.run(jioendpoint.java:310) java.util.concurrent.threadpoolexecutor.runworker(未知来源) java.util.concurrent.threadpoolexecutor $ worker.run(未知来源) java.lang.thread.run(未知来源)
请注意,根本原因的完整堆栈跟踪可在Apache Tomcat/7.0.47日志中使用。
我试图通过使用不同的SerialVersionID来删除此错误,并在运行该项目之前对其进行清洁。仍然陷入困境。请帮忙。预先感谢。
您的servlet类com.sar.pkg.MyServlet
不公开。您的定义
class MyServlet extends HttpServlet{
应该是
public class MyServlet extends HttpServlet{