servlets

Tomcat 10.x throws java.lang.NoClassDefFoundError on javax.servlet.* [duplicate]

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According to your logs, C:\Users\Ing.Girbson BIJOU\Documents\NetBeansProjects\apache-tomcat-10.0.4-windows-x64\apache-tomcat-10.0.4\conf\Catalina\localhost\VirtualStore.xml you’re thus using Tomcat 10.x which is based off Servlet API version 5.0 which in turn is part of Jakarta EE version 9. However, this exception is unexpected: java.lang.NoClassDefFoundError: javax/servlet/ServletRequestListener Basically, the deployed web application is looking for javax.servlet.*, but it should actually be looking for jakarta.servlet.*. Namely, the … Read more

How can I manually load a Java session using a JSESSIONID?

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There is no API to retrieve session by id. What you can do, however, is implement a session listener in your web application and manually maintain a map of sessions keyed by id (session id is retrievable via session.getId()). You will then be able to retrieve any session you want (as opposed to tricking container … Read more

How does a single servlet handle multiple requests from client side

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Each request is processed in a separated thread. This doesn’t mean Tomcat creates a new thread per request. There is a pool of threads to process requests. Also there is a single instance for each servlet and this is the default case.(Some more information). Your servlet should be Thread Safe i.e. it should be stateless. … Read more

Encoding and Servlet API: setContentType or setCharacterEncoding

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The javadoc is pretty clear about the difference: void setCharacterEncoding(String charset) Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. If the character encoding has already been set by setContentType(java.lang.String) or setLocale(java.util.Locale), this method overrides it. Calling setContentType(java.lang.String) with the String of text/html and calling this … Read more

Where do I get servlet-api.jar from?

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Make sure that you’re using the same Servlet API specification that your Web container supports. Refer to this chart if you’re using Tomcat: http://tomcat.apache.org/whichversion.html The Web container that you use will definitely have the API jars you require. Tomcat 6 for example has it in apache-tomcat-6.0.26/lib/servlet-api.jar

How to deploy a JAX-RS application?

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There are a number of options for deploying into a Java EE 6 container (more specifically a Servlet 3.0 implementation): The simplest is: <?xml version=”1.0″ encoding=”UTF-8″?> <web-app xmlns=”http://java.sun.com/xml/ns/j2ee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_3_0.xsd” version=”3.0″> <servlet> <servlet-name>javax.ws.rs.core.Application</servlet-name> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>javax.ws.rs.core.Application</servlet-name> <url-pattern>/rest/*</url-pattern> </servlet-mapping> </web-app> Then all the @Path and @Provider classes found in your web application will be … Read more

Using special auto start servlet to initialize on startup and share application data

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None of both is the better approach. Servlets are intended to listen on HTTP events (HTTP requests), not on deployment events (startup/shutdown). CDI/EJB unavailable? Use ServletContextListener @WebListener public class Config implements ServletContextListener { public void contextInitialized(ServletContextEvent event) { // Do stuff during webapp’s startup. } public void contextDestroyed(ServletContextEvent event) { // Do stuff during webapp’s … Read more

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