You need to add the Servlet API to your classpath. In Tomcat 6.0, this is in a JAR called servlet-api.jar in Tomcat’s lib folder. You can either add a reference to that JAR to the project’s classpath, or put a copy of the JAR in your Eclipse project and add it to the classpath from … Read more
Normaly you can GET and POST parameters in a servlet the same way: request.getParameter(“cmd”); But only if the POST data is encoded as key-value pairs of content type: “application/x-www-form-urlencoded” like when you use a standard HTML form. If you use a different encoding schema for your post data, as in your case when you post … Read more
org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application That URI is for JSTL 1.0, but you’re actually using JSTL 1.2 which uses URIs with an additional /jsp path (because JSTL, who invented EL expressions, was since version 1.1 integrated as part of JSP 2.0 … Read more
Write the JSON object to the response object’s output stream. You should also set the content type as follows, which will specify what you are returning: response.setContentType(“application/json”); // Get the printwriter object from response to write the required json object to the output stream PrintWriter out = response.getWriter(); // Assuming your json object is **jsonObject**, … Read more
I will put a small comparison table here (just to have it somewhere): Servlet is mapped as /test%3F/* and the application is deployed under /app. http://30thh.loc:8480/app/test%3F/a%3F+b;jsessionid=S%3F+ID?p+1=c+d&p+2=e+f#a Method URL-Decoded Result —————————————————- getContextPath() no /app getLocalAddr() 127.0.0.1 getLocalName() 30thh.loc getLocalPort() 8480 getMethod() GET getPathInfo() yes /a?+b getProtocol() HTTP/1.1 getQueryString() no p+1=c+d&p+2=e+f getRequestedSessionId() no S%3F+ID getRequestURI() no /app/test%3F/a%3F+b;jsessionid=S+ID … Read more
I love Jetty for its low maintenance cost. It’s just unpack and it’s ready to roll. Tomcat is a bit high maintenance, requires more configuration and it’s heavier. Besides, Jetty’s continuations are very cool. EDIT: In 2013, there are reports that Tomcat has gotten easier. See comments. I haven’t verified that.
Resin 3.0 documents this behavior: load-on-startup can specify an (optional) integer value. If the value is 0 or greater, it indicates an order for servlets to be loaded, servlets with higher numbers get loaded after servlets with lower numbers. The JSP 3.1 spec (JSR 340) says this on page 14-160: The element load-on-startup indicates that … Read more
You can indeed not define the filter execution order using @WebFilter annotation. However, to minimize the web.xml usage, it’s sufficient to annotate all filters with just a filterName so that you don’t need the <filter> definition, but just a <filter-mapping> definition in the desired order. For example, @WebFilter(filterName=”filter1″) public class Filter1 implements Filter {} @WebFilter(filterName=”filter2″) … Read more
In Java 8, you can do it in a simpler and clean way : if (“POST”.equalsIgnoreCase(request.getMethod())) { test = request.getReader().lines().collect(Collectors.joining(System.lineSeparator())); }
<url-pattern>/*</url-pattern> The /* on a servlet overrides all other servlets, including all servlets provided by the servletcontainer such as the default servlet and the JSP servlet. Whatever request you fire, it will end up in that servlet. This is thus a bad URL pattern for servlets. Usually, you’d like to use /* on a Filter … Read more