I am having a strange problem in deploying a basic web app through Eclipse and Tomcat
The error -
SEVERE: Allocate exception for servlet DeCommServlet
java.lang.ClassNotFoundException: com.authentication.DeCommServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
However, the application still gets to the DeCommServlet doPost() method and tomcat stays deployed but with that error.
Servlet:
<servlet>
<servlet-name>DeCommServlet</servlet-name>
<servlet-class>com.authentication.DeCommServlet</servlet-class>
</servlet>
<!-- Servlet Mappings -->
<servlet-mapping>
<servlet-name>DeCommServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
The servlet class is the correct link but still getting this error. I have nothing in any of the lib folders, but in the application properties I have the Apache Tomcat Lib added in Build Path >> Libraries
Has anyone seen this before?
Code for DeCommServlet:
#WebServlet("/DeCommServlet")
public class DeCommServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public DeCommServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("sdf");
System.out.println("ddd");
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.getUserPrincipal().getName();
response.sendRedirect("http://www.google.com");
}
New Class Path1
This is how your webapp should look like :
> DeCommGlobal
> |-->src
> |-->com
> |-->authentication
> |-->DeCommServlet.java
> |-->META-INF
> |-->WEB-INF
> |-->classes
> |-->lib
It was the deployment assembly that was causing the issue. Added the lib folder and we are good to go! Thanks
Related
I have a dynamic web project that has worked perfectly fine many times, but after going to Run As > Maven clean, I tried running my application again and when trying to go to the url http://localhost:8080/Servlet_Project/AccountServlet I get an error saying the requested resource is not available. No exception is thrown - I can't seem to be able to access the servlet. Here is my AccountServlet.java. I also mapped the servlet in the web.xml but thought it was unnecessary because of the annotations.
#WebServlet("/AccountServlet")
public class AccountServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public AccountServlet() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.getRequestDispatcher("/account.jsp").forward(request, response);
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
HibernateClient hc = HibernateClient.getInstance();
Accounts a = hc.getAccount(username, password);
if(a==null){request.getRequestDispatcher("/login.jsp").forward(request, response);
}
else{
HttpSession sess = request.getSession();
sess.setMaxInactiveInterval(600);
sess.setAttribute("username", username);
sess.setAttribute("firstName", a.getFirstname());
sess.setAttribute("lastName", a.getLastname());
sess.setAttribute("address", a.getAddress());
sess.setAttribute("state", a.getState());
sess.setAttribute("country", a.getCountry());
sess.setAttribute("phone", a.getPhone());
sess.setAttribute("SSN", a.getSsn());
sess.setAttribute("email", a.getEmail());
sess.setAttribute("city", a.getCity());
String balances = (a.getBalance()).toString();
double balance = Math.round(Double.parseDouble(balances)* 100d)
sess.setAttribute("balance", balance);
request.getRequestDispatcher("/account.jsp").forward(request, response);}}
}
I have written a simple HelloServlet as follows.
import java.io.IOException;
import java.io.PrintWriter;
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 HelloServlet
*/
#WebServlet("/HelloServlet")
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public HelloServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String docType =
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
"Transitional//EN\">\n";
out.println(docType +
"<HTML>\n" +
"<HEAD><TITLE>Hello</TITLE></HEAD>\n" +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1>Hello</H1>\n" +
"</BODY></HTML>");
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
I have GlassFish 3.1 installed in the Java EE perspective in Eclipse.
Whenever I try and run the servlet clicking on "run on server" on the server it comes up with the following message:
This domain requires an administrative password to be set before the
domain can be started. Please specify an administrative password. The
Master Password is required to start the domain. No console, no
prompting possible. You should either create the domain with
--savemasterpassword=true or provide a password file with the --passwordfile option.
Command start-domain failed.
There is always a default master password "changeit" for glassfish. Why is it prompting me with this message ?
am using Eclipse's New->Servlet wizard thereby having auto-generated servlet and servlet-mapping entries ready for me. But when I select a servlet's java file and delete it, the corresponding entries in web.xml don't get deleted.
How do I do this?
I would imagine just edit the web.xml file and delete the entries. It's likely by design that they are not automatically deleted when you delete the servlet.
How about using Annotations? You don't have to take care of any configuration in web.xml for this.
package com.inventwheel.servlet;
import java.io.IOException;
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 DeleteMe
*/
#WebServlet(description = "DeleteMe Servlet", urlPatterns = { "/DeleteMe" })
public class DeleteMe extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public DeleteMe() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
I use JBoss AS 6 with Seam 2.2 in Eclipse. I had create a simple Seam 2 Web Project, (I think with seam gen) and now I wanted to add servlet.
File->New->Servlet
public class Test extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
writer.println("Hello post!");
writer.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
writer.println("Hello get!");
writer.close();
}
}
In web.xml there is also the servlet registrated.
Okay, but when I compile all and go to localhost:8080/mypage/test the page get loaded but no output is visible (also not in the sourcecode of the page).
The symptoms indicate that your project isn't properly deployed. Make sure that your project is properly built and deployed and that the server is cleanly restarted.
I am trying to call a servlet when submitting the FormPanel in GWT.I am setting the url on form.setAction("myurl") and also done mapping on the web.xml but while on the form suvmit the servlet is not called.Here is the code:
public class MainEntryPoint implements EntryPoint {
public void onModuleLoad() {
AbsolutePanel panel=new AbsolutePanel();
FileUpload upload = new FileUpload();
upload.setName("file");
final FormPanel form = new FormPanel();
form.setWidget(panel);
form.setMethod(FormPanel.METHOD_POST);
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setAction("/NewServlet");
RootPanel.get().add(new Label("path="+GWT.getModuleBaseURL()+"/NewServlet"));
Button sub=new Button("Submit");
sub.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
RootPanel.get().add(new Label("In click event submiting form"));
try{
form.submit();
}catch(Exception e){RootPanel.get().add(new Label(e+""));}
}});
form.addFormHandler(new FormHandler() {
public void onSubmit(FormSubmitEvent event) {
// This event is fired just before the form is submitted. We can take
// this opportunity to perform validation.
RootPanel.get().add(new Label("On submit"));
}
public void onSubmitComplete(FormSubmitCompleteEvent event) {
// When the form submission is successfully completed, this event is
// fired. Assuming the service returned a response of type text/html,
// we can get the result text here (see the FormPanel documentation for
// further explanation).
RootPanel.get().add(new Label("On submiting complete"));
}
});
panel.add(upload);
panel.add(sub);
RootPanel.get().add(form);
}
}
Here is the web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>upload</servlet-name>
<servlet-class>org.fileup.client.UploadServlet2</servlet-class>
</servlet>
<servlet>
<servlet-name>NewServlet</servlet-name>
<servlet-class>NewServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>upload</servlet-name>
<url-pattern>/uploadservlet2</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>NewServlet</servlet-name>
<url-pattern>/NewServlet</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>welcomeGWT.html</welcome-file>
</welcome-file-list>
</web-app>
And NewServlet.java
public class NewServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
// /* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet NewServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet NewServlet at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* #param request servlet request
* #param response servlet response
* #throws ServletException if a servlet-specific error occurs
* #throws IOException if an I/O error occurs
*/
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* #param request servlet request
* #param response servlet response
* #throws ServletException if a servlet-specific error occurs
* #throws IOException if an I/O error occurs
*/
#Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* #return a String containing servlet description
*/
#Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
Please tell me how can I call the NewServlet on submitting the FormPanel.
You probably want form.setAction(GWT.getHostPageBaseURL() + "NewServlet")
Or as an alternative you could use: form.setAction("NewServlet");
Very similar code, with your exact setAction statement, works for me. Possibly the problem was just that
<servlet-class>NewServlet</servlet-class>
left out the dotted path, e.g. org.fileup.server., to NewServlet.