I am trying to deploy a single maven webapp on a Websphere Liberty Server.
My code (XCCQuery.java):
package TTAQuery;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.core.Response;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Response;
#WebServlet(name="XCCQuery", urlPatterns={"/hello"})
public class XCCQuery extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
String simpleParam = getServletConfig().getInitParameter("simpleParam");
out.println("Hello World "+simpleParam);
out.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
My web.xml looks like this:
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>XCCQuery</servlet-name>
<display-name>XCCQuery</display-name>
<description></description>
<servlet-class>XCCQuery</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>XCCQuery</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
I try to access:
http://localhost:9087/XCCQueryServlet/rest/hello
but always get:
Error 404: javax.servlet.UnavailableException: SRVE0200E: Servlet [XCCQuery]: Could not find required class - XCCQuery
Seems to be a deployment mistake for me.
What's wrong here?
Related
I am trying to build a delegate servlet in Liferay that needs to know the list of connected users in Liferay (using com.liferay.portal.service.UserLocalServiceUtil)
I had no problem getting a simple delegated servlet to work and say Hello when deployed in Liferay, but when I try to use UserLocalServiceUtil I get this exception
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'com.liferay.portal.service.UserLocalService' is defined
Reading docs it seems that a delegate server could access core portal utilities, but could I be wrong. Any help or advice will be appreciated.
This is the servlet
package mycompany.liferay;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.liferay.portal.service.UserLocalServiceUtil;
import com.liferay.portal.service.UserServiceUtil;
import com.liferay.portal.model.User;
import java.util.List;
public class myDelegateServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>My delegate Servlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>My delegate Servlet at " + request.getContextPath() + "</h1>");
int userCount = UserLocalServiceUtil.getUsersCount();
List<User> users = UserLocalServiceUtil.getUsers(0, userCount);
out.print("<br>Connected Users:<br>");
for (User user : users)
{
out.print("<li>User: "+user.getUserId()+"</li>" );
}
out.println("</body>");
out.println("</html>");
}
catch (Exception e)
{
out.print("Exception! "+e.getMessage() );
}
finally {
out.close();
}
}
...
and this its definition at web.xml
<servlet>
<servlet-name>myDelegateServlet</servlet-name>
<servlet-class>com.liferay.portal.kernel.servlet.PortalDelegateServlet</servlet-class>
<init-param>
<param-name>servlet-class</param-name>
<param-value>mycompany.liferay.myDelegateServlet</param-value>
</init-param>
<init-param>
<param-name>sub-context</param-name>
<param-value>myDelegateServlet</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
Have a look at this sample servlet. https://github.com/liferay/liferay-blade-samples/tree/master/gradle/extensions/servlet. The approach that you mentioned is more for the 6.2 version.
Then when you have the OSGi component you can easily inject services.
#Reference
private UserLocalService servcie;
You need to have the dependency org.osgi:org.osgi.service.component.annotations:1.3.0
Alternatively have a look at the JAX-RS interface
I am totally new to writing servlets. I have created a simple HelloWorld program, but while running the application I'm getting the following error:
HTTP Status 404 - /HelloWorld/HelloWorld
type Status report
message /HelloWorld/HelloWorld
description: The requested resource is not available.
Below is my code:
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;
#WebServlet("/HelloWorld")
public class HelloWorld extends HttpServlet {
private static final long serialVersionUID = 1L;
public HelloWorld() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out=response.getWriter();
out.println("Hello World");
}
}
And my web.xml
<display-name>HelloWorld</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>
</web-app>
I'm using Tomcat version:7.0 and my IDE is Eclipse Luna. Why is this error being thrown?
your_war_file_name/HelloWorld... You can find the war file name under webapps folder in Tomcat directory. Here I just recreated the same. My war file name is website.war. It works for me. The url is http://localhost:8090/website/developer . I got the response "Hello World" .... :)
package com.test.developer;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Test extends HttpServlet{
private static final long serialVersionUID = 1L;
public Test() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Inside servelt");
PrintWriter out=response.getWriter();
out.println("Hello World");
}
}
and my web.xml is
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>website</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>
<servlet-name>developer</servlet-name>
<servlet-class>com.test.developer.Test</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>developer</servlet-name>
<url-pattern>/developer</url-pattern>
</servlet-mapping>
</web-app>
i'm new to REST Service. i've done a small REST Webservice application and deployed in my online tomcat webserver,
My link -->
http://sample.com.au/REST/WebService/MyMethod?name=sss
but i'm getting the following message
The requested URL /REST/WebService/MyMethod was not found on this server.
when i run the similar in eclipse locally its working....
can anyone please tell me some solution for this...
my web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>
<web-app>
:
:
<servlet>
<servlet-name>ServletAdaptor</servlet-name>
<servlet-class>com.sun.jersey.server.impl.container.servlet.ServletAdaptor</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ServletAdaptor</servlet-name>
<url-pattern>/REST/*</url-pattern>
</servlet-mapping>
</web-app>
My FeedService.java
package webService;
import java.util.ArrayList;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import model.ProjectManager;
import com.google.gson.Gson;
import dto.FeedObjects;
#Path("/WebService")
public class FeedService {
#GET
#Path("/MyMethod")
#Produces("application/json")
public String names(#QueryParam("name") String name)
{
System.out.println("name----------->"+name);
String feeds = null;
try
{
ArrayList<FeedObjects> feedData = null;
ProjectManager projectManager= new ProjectManager();
feedData = projectManager.GetFeeds(name);
Gson gson = new Gson();
System.out.println(gson.toJson(feedData));
feeds = gson.toJson(feedData);
}
catch (Exception e)
{
System.out.println("Exception Error"); //Console
}
return feeds;
}
}
context.xml
<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/iloadlogistics.com.au"/>
Refer here. Specifically check Example 4.1 and Example 4.5. Should you not deploy that way?
I was testing a demo servlet file But, the servlet doesn't seem to respond. I'm not able to understand the problem.
When I click submit on the HTML form the URL is
localhost:8080/Beer-V1/SelectBeer.do
But, shouldn't it be /BeerSelect? Because of #WebServlet("/BeerSelect") ???
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"
xmlns:web="http://java.sun.com/xml/ns/javaee/web- app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" metadata-complete="false"
version="3.0">
<servlet>
<servlet-name>CH3 Beer</servlet-name>
<servlet-class>com.example.web.BeerSelect</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CH3 Beer</servlet-name>
<url-pattern>/SelectBeer.do</url-pattern>
</servlet-mapping>
</web-app>
BeerSelect.java
package com.example.web;
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;
#WebServlet("/BeerSelect")
public class BeerSelect extends HttpServlet {
private static final long serialVersionUID = 1L;
public BeerSelect() {
super();
}
#Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("Beer Selection Advice<br>");
String c = request.getParameter("color");
out.println("<br> Got Beer Color " + c);
}
}
When I click submit on the HTML form the URL is localhost:8080/Beer-V1/SelectBeer.do
But, shouldn't it be /BeerSelect? Because of #WebServlet("/BeerSelect") ???
web-container associates a "context-path" for each of the web-application deployed and in your case, I believe it is "Beer-V1".
You have overridden the mapping in web.xml as below and hence you are seeing *.do
<servlet-mapping>
<servlet-name>CH3 Beer</servlet-name>
<url-pattern>/SelectBeer.do</url-pattern>
</servlet-mapping>
The xml DD overrides the annotations.
I have modified my application to find out the number of users logged in a web application below is my piece of code..
the listener class
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
public class SessionCounter implements HttpSessionListener
{
private static int count;
public static int getActiveSessions() {
return count;
}
public SessionCounter()
{
}
//The "sessionCount" attribute which has been set in the servletContext should not be modified in any other part of the application.
//Since we are using serveltContext in both the methods to modify the same variable, we have synchronized it for consistency.
public void sessionCreated(HttpSessionEvent e)
{
count++;
ServletContext sContext = e.getSession().getServletContext();
synchronized (sContext)
{
sContext.setAttribute("sessionCount", new Integer(count));
}
}
public void sessionDestroyed(HttpSessionEvent e)
{
count--;
ServletContext sContext = e.getSession().getServletContext();
synchronized (sContext)
{
sContext.setAttribute("sessionCount", new Integer(count));
}
}
}
and the main servlet is ..
package com.saral;
import java.io.IOException;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
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 First
*/
//#WebServlet("/First")
public class MyServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
static final Logger logger = Logger.getLogger(MyServlet.class);
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PropertyConfigurator.configure("log4j.properties");
logger.info("before---->");
// TODO Auto-generated method stub
String name=request.getParameter("txtName");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("Hello,"+name);
out.println("<br> this output is generated by a simple servlet.");
out.println("Total Number of users logged in--->"+SessionCounter.getActiveSessions());
out.close();
}
}
and the web.xml is ...
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>FirstDemo</display-name>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.properties</param-value>
</context-param>
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>com.saral.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/helloServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>home.html</welcome-file>
</welcome-file-list>
<listener>
<listener-class>com.saral.SessionCounter</listener-class>
</listener>
</web-app>
but I am getting the total number of users logged in as 0 , which is not perfect, please advise where I am wrong and how can I overcome from this.
When a client request come to the Tomcat server and you don't call request.getSession(), then the Tomcat server stil creates a session automatically. After that, the method sessionCreated(...) in your SessionCounter class is called.
The method sessionDestroyed(...) will be called when a session is destroyed. That occurs when you call session.invalidate(). If you close a tab on browser or close a browser, the session is still alive on your tomcat server.
I think so. You can use some diffrent listeners to archive your goal: HttpSessionAttributeListener, HttpSessionBindingListener,...