So recently I learned that in order to serve static files with a Last-Modified header from Google App Engine, I had to write my own (simple) servlet to do that. OK fine, I went and did it, results can be viewed here. But now I find that File.lastModified() is always returning the same value, no matter that I have touched the file, even...
When i click a link im calling a servlet. When i click that link multiple time the servlet throws an error (error details not important) Though there are other work around for this fix (Like disable the link once clicked, etc) I am curious is there any way to control this thru request/response Object. ...
On the web site I am trying to help with, user can type in an URL in the browser, like following Chinese characters, http://localhost:8080?a=测试 On server, we get GET /a=%E6%B5%8B%E8%AF%95 HTTP/1.1 As you can see, it's UTF-8 encoded, then URL encoded. We can handle this correctly by setting encoding to UTF-8 in Tomcat. However...
I am getting an unusual error while running my application, just wondering if anyone has come across this before. I am using google protocol buffers, my servlet takes a request and tries to process it, I have the following code: InputStream s = request.getInputStream(); AdRequest adRequest = AdRequest.parseFrom(s); After executing th...
I'd like to display an IPv6 address on a web page, as done on http://ipv6.whatismyv6.com/ What's the best way to do this? A code sample would be most awesome. ...
While i am serving text/html resource resource i want to make it the resource as readonly. And we need to restrict editing the readonly attribute who is downloading the resource ...
Hello, Could anyone please tell me, what the meaning of the word "Deploy" and "Redeploy" in context of Tomcat in the following line: ServletConfig parameters won't change for as long as this servlet is deployed an running. To change them, you'll have to redeploy the servlet Thanks very much in advance. ...
I use Resin webserevr. There is great FileServlet class for serving static content. I'd like to remap URIs like /user1/file.txt -> /users/dir1/1/file.txt /user2/file.txt -> /users/dir2/22/file.txt ... in runtime. But username->path mapping is not static and based on some database data. ...
Hi, I'm a little confused by the following paragraph: "The effect of implementing SingleThreadModel is virtually the same as synchronizing the service method. Both can bring a web app to its knees without protecting the session and context state." As STM synchronizes the service method, so isn't it quite obvious that it'll also synchr...
I want to invalidate sessions of users based on some Event. I store their sessionID, how to get their HttpSession from this ID? The HttpSessionContext class is deprecated with no replacement. ...
I am trying to access a resource file from a servlet but getting HTTP Error 500 - access denied: File file = new File("//warChildFolder//myFile.txt"); InputStream is = new FileInputStream(file); // <--error on this line I am on google-app-engine. Any help appreciated! ...
I would like to get the name of the form used to post parameters from a Java HTTPServletRequest object. Is this possible. I don't see any method that looks like it will return it to me. ...
I work on a very high volume public website running on Tomcat 5.5. Currently we require stickiness to a particular server in order to maintain session. I'd like to start replicating session, but have had trouble finding a good FOSS solution. I've written my own Manager (using memcached as the store) but am having trouble dealing with ...
I'm trying to generate graphs dynamically using JFreeChart as a result of some checkboxes the user selects, but I can't figure out how best to get the generated datasets into chart form (I have code that makes charts from these, but need to produce pngs) and into the JSP view. Currently, I can only think of sending the Datasets to the J...
I am trying to merge 1000 PDF Files thru iText. I am not sure where the memory leakage is happening. Below is the sample code. Note that i am removing the child-pdf file as soon as i merge to the parent file. Please pointout bug in below code or is there any better way to do this with out memory conception. This process is done thru serv...
What are the primary reasons for using the J2EE (EJB's) over just a simple servlet implementation? I am working on developing a new project that will primarily be a web service that must be very fast and scalable. Sorry for any confusion, Although I am experienced in Java, I am very new to the Java Web world, and may not be asking thi...
Hi all, I want to improve my site usability by providing users some kind of "related search" funcionality if they are coming from a search engine. It is possible, from a servlet, to obtain if a visitor of my site is coming from search engine results page? If yes, is possible to obtain the query string? Thanks in advance EDIT: Thanks...
I am trying to serve PDF (useing tomcat server + Servlet normal streaming). The steaming is stable there is no bug and it handling parallel serving. But not as fast as Google DOC PDF Streaming. My Question is how did they do that fast ? What server they use (Apache + PHP)? or Python? Please suggest which technology i can use to speed ...
I need to start developing using this technology servlets/jsp with tomcat. I need to get up to speed fairly quick. What would you recommend to get up there fairly quick? No 900+ pages manuals. A good tutorial (even a video lectures) with lots of examples would be perfect. Thanks ...
Is it good idea to run linux process in multi user environment. Ex: Runtime rt = Runtime.getRuntime(); Process proc = rt.exec("linux command"); int exitVal = proc.waitFor(); // may wait till 5 to 10 mins ...