I'm newbie developer.In my code html page is properly displying in browser but after submiting data it is not calling post method and hence not storing data in my mysql workbence database. Schema name in databse is registration and table name is reg_details.I am using apache tomcat server.
HTML file:
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="Registration" method="post" autocomplete="on">
<fieldset>
<legend>Registration Details:</legend>
First Name   <input type="text" name="firstname" autofocus>   Middle name   <input type="text" name="middlename">   Last Name   <input type="text" name="lastname"><br><br>
Address   <br> <textarea name="address" rows="2" cols="25"></textarea>
<br><br>
Gender   <input type="radio" name="gender" value="male"> Male <input type="radio" name="gender" value="female"> Female<br><br>
Mobile No.   <input type="text" name="mobileno"> <br><br>
Email Id   <input type="email" name="emailid"> <br><br>
Birth Date   <input type="date" name="birthday"><br><br>
Username   <input type="text" name="username"><br><br>
Password   <input type="password" name="password"><br><br>
<input type="submit" value="Submit">
</fieldset>
</form>
</body>
</html>
registration.java file
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Registration
*/
@WebServlet("/Registration")
public class Registration extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Registration() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//http://localhost:12093
try {
String firstname=request.getParameter("firstname");
PrintWriter print = response.getWriter();
print.println(firstname);
Class.forName("com.mysql.jdbc.Driver");
java.sql.Connection connection;
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/registration","root","rohan");
PreparedStatement ps=connection.prepareStatement("INSERT INTO reg_details (name) values ('rk');");
//Statement stmt = connection.createStatement();
// ResultSet result = stmt.executeQuery("INSERT INTO reg_details (name) values ('rohan');");
ps.setString(1, firstname);
ps.executeUpdate();
// while(result.next())
// {
// PrintWriter print = response.getWriter();
// print.println(result.getString("name"));
// }
connection.close();
ps.close();
} catch (SQLException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
For writing connection con = DriverManager.getconnection(); its telling me to write like this java.sql.Connection connection; or connection con = (connection)DriverManager.getconnection();
I updated the with your suggestions. I closed the connection at end and removed the service method but after executing same error exits. I am attaching my console so that it will help you. I used mysql-connector-java-5.1.44-bin.jar for database connection.
Here is stacktrace from server console :
org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Hospital Queue Management' did not find a matching property. org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:
org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number: 8.0.48.0
org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture: amd64
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8085"]
org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8019"]
org.apache.catalina.startup.Catalina start
INFO: Server startup in 1512 ms
WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.PreparedStatement.checkBounds(PreparedStatement.java:3327)
at com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3312)
at com.mysql.jdbc.PreparedStatement.setString(PreparedStatement.java:4027)
at Registration.doPost(Registration.java:44)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
e.printStackTrace()please check the logs of the server you're using (tomcat, jetty, w/e) to run the application and see if there is an exception printed there. That's vital information to find issues and solve them. Besides, pay attention to the basic concepts. MySQL is the database engine, MySQL Workbench is a client tool that allows you to "see" a human representation of the databases and tables inside your MySQL engine.