From the HttpServletRequest#getQueryString() javadoc: Returns: a String containing the query string or null if the URL contains no query string. The value is not decoded by the container. Note the last statement. So you need to URL-decode it youself using java.net.URLDecoder. String queryString = URLDecoder.decode(request.getQueryString(), “UTF-8”); However, the normal way to gather parameters is just … Read more
The particular exception message is telling you that the mentioned class is missing in the classpath. As the org.apache.commons.io package name hints, the mentioned class is part of the http://commons.apache.org/io project. And indeed, Commons FileUpload has Commons IO as a dependency. You need to download and drop commons-io.jar in the /WEB-INF/lib as well. See also: … Read more
You’re calling request.getParameter() instead of request.getAttribute() to obtain the value. Since you’ve set it as request attribute, you should also get it as request attribute. So: request.setAttribute(“foo”, foo); is only available by Object foo = request.getAttribute(“foo”); // NOT getParameter(). The getParameter() is only for HTTP request parameters as you can specify in request URL or … Read more
You could use ServletContext#getRealPath() to convert a relative web content path to an absolute disk file system path. String relativeWebPath = “/WEB-INF/static/file1.ext”; String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath); File file = new File(absoluteDiskPath); InputStream input = new FileInputStream(file); // … However, if your sole intent is to get an InputStream out of it, better use ServletContext#getResourceAsStream() instead … 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
Here, String url = (String) request.getAttribute(“url”); you’re trying to get a request parameter as a request attribute instead of as a request parameter. This will obviously not do what you want. You need to get a request parameter as a request parameter, not as a request attribute. String url = request.getParameter(“url”); Unrelated to the concrete … Read more
I encountered this problem in Netbeans 12.0 today using OpenJDK 14. It turns out the problem was resolved by installing the nb-javac plugin.
Use RequestDispatcher#include() on an URL matching the url-pattern of the Servlet. public class Populate_ALL extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(“text/plain”); request.getRequestDispatcher(“/populateServlet1”).include(request, response); request.getRequestDispatcher(“/populateServlet2”).include(request, response); request.getRequestDispatcher(“/populateServlet3”).include(request, response); //… } } Note: if those servlets cannot be used independently, then this is the wrong approach and you should be … Read more
This is the default response of the default implementation of HttpServlet#doXxx() method (doGet(), doPost(), doHead(), doPut(), etc). This means that when the doXxx() method is not properly being @Overriden in your servlet class, or when it is explicitly being called via super, then you will face a HTTP 405 “Method not allowed” error. So, you … Read more
Your web app has servlet container specific libraries like servlet-api.jar file in its /WEB-INF/lib. This is not right. Remove them all. The /WEB-INF/lib should contain only the libraries specific to the Web app, not to the servlet container. The servlet container (like Tomcat) is the one who should already provide the servlet container specific libraries. … Read more