1. Difference each instance of servlet and each thread of servlet in servlets? stackoverflow.comAre there multiple instances of servlet class? As I hear "each instance of servlet" Can anybody elaborate on this? |
2. How can I get the thread id of the threads of the servlet? stackoverflow.comJust as the title. Google didn't give me any clue. Edit: What I mean is to get the threads that executing the code of the servlet. Thanks. Edit: Why I want this information, ... |
3. Servlets and Threads coderanch.comHi everyone, Is the only time I need to synchronise a method in a servlet, when that method accesses a global variable at the top of the servlet. For example this Wouldnt need sync'd public String getSomething(String nameFromOtherMethod){ String greeting = "Hello"; String name = nameFromOtherMethod; return greeting + nameFromOtherMethod; } I'm trying to figure out why most methods dont need ... |
4. Thread problem in Servlet coderanch.comIm facing problem of threads while calling different methods of different classes from Servelts. My scenario is that there could be different users those could access the same servlets simoltaneously & from the service method Im callind different methods of the beans/simple classes which are interactig with database also. If more then two users are accessing the same screen or other ... |
5. Kicking off a thread from a servlet - please help! coderanch.comI am currently writing a utility to do some performance monitoring on a Websphere instance. I have a job that collates the necessary values and writes them to a txt file. I want to be able to visit a PerformanceMonitor servlet which will in turn kick off the job. The job - WritePropsFileRunner implements Runnable. WritePropsFileRunner.run() runs a static class (WriteFile.class) ... |
6. Calling Threads from servlet coderanch.com |
7. Threads/servlets/long task coderanch.comThe problem: 1) Tomcat 3.3, struts, web client. 2) Launch the printing of 1000 (yes, one thousand) pdf files. One developers idea is to return a response immediately - after launching background threads to complete the tasks. My intuition is that this a bad idea for at least one reason: The servlet spec, as I understand it, allows a servlet container ... |
8. Threads with servlets coderanch.comHi all, I am trying to make my servlet methods get and post with threading. What if I use only synchronized on my get method. public synchronized void doGet(HttpServletRequest request.. or must I achieve threading in other ways or how(want sample code e.g.. Must I overide servlet API's for Weblogic 7.0.) Actually..I am reading a file from servlet ,if multiple access ... |
9. Threads In Servlets coderanch.comHi All, for one of my requirements i am forced to create threads inside a servlet adn it is kind of working fine, but what i want to understand is, will it have any side effects? will it affect the performance of my application in any way, because i am opening a socket connection to some other server from within my ... |
10. Servlets coderanch.comFirst of all, this is not really a threads question. Maybe it would help if you posted in the the servlet forum. But to answer your question, a servlet is just code running in a container. You should be able to access an entity bean the same way if it was an application. For most application servers, the answer would be ... |
11. Servlet Running in Infinite loop coderanch.comYou should introduce a boolean variable, which is set from outside the thread. The thread should then check that variable every so often, and if it is set, it should quit. Note that threads started this way aren't necessarily terminated if the web app is stopped and restarted (as ooposed to the server being stopped and restarted). It would be better ... |
12. Threads and servlet coderanch.comhi guyz, I have a servlet that initlises and call ths run method of a java class that generates a thread pool and assigns objects to the allowed threads as each of them gets free with an object from the list of objects given to it. Now when i shout down my server by using "kill processid" the server does not ... |
13. can thread with servlet class coderanch.com |
14. destroy() and killing servlet threads coderanch.com |
15. Servlet requesting threads coderanch.comNot necessarily. In most servlet containers they probably do use the same instance, (unless the serlvet is marked as SingleThreadMode), but the spec makes no guarantee about that, and allows container authors to use any strategy they feel is appropriate - single instance, multiple instance in the same JVM, multiple instances in different JVMs, multiple instances on separate machines and so ... |
16. Multi-threaded servlet coderanch.com |
17. Life cycle of a servlet and threads? coderanch.com |
18. Threading issues in servlet coderanch.comHi all, I am writing an application which involves a servlet which processes user request.This servlet might be accessed by more than one user simultaneously.My question is will the servlet engine(i am using JRun) or the webserver (IIS) take care concurrent user request?is there anything i need to do to make sure that my application doesn't crash?is there any precaution i ... |
19. Servlets and Threading coderanch.comPut it this way.. it is not so much a matter of 'are threads necessary'... as it is of ' you will get threads, because servlets are multithreaded' So if you have database access code, you must decide whether you should make this a synchronized block or not. I'm not really that knowledgable about databases, but I understand there is such ... |
20. Servlets + Threads coderanch.comHi all, my question is the following: I have a servlet which communicates with a remote device to issue queries. I'd like to have a thread for each of the users that log into the web site (started when they first use the servlet) which will check how many requests are coming from this user's IP address, so that I can ... |
21. Threads in Servlets coderanch.com |
22. Threads in servlets coderanch.comYes, but since a servlet is an in-and-out type of environment (rather than running the way an executable program does), the thread would either have to run quickly enough to make the need for a thread questionable or the thread would have to be stored in a non-volatile part of the class. For a long-running process, it's often better to run ... |
23. Servlets and Threads (URGENT) coderanch.comI am trying to implement the following code. But I didnot understand the Thread based problems in Servlets. Should I use Syncronized {} at the following code when changing a variable in the servlet code? import java.io.*; import java.util.*; // import continues .. public class Controller extends javax.servlet.http.HttpServlet { // Code continues ..... public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, ... |
24. Dealing with multi-threading in servlets coderanch.comIf you have a servlet that is accessing a common variable just use synchronized(this){ .. code blah .. code blah } This means that if a thread enters this block of code, no other thread can enter this block. OR You could implement the singleThreadModel by using the following script.. <%@ page isThreadSafe="false" %> THis indicates that your code is not ... |
25. Multi thread servlets and the Server applications they call. coderanch.comI realize "Instance variables of the servlet are not thread safe", but how about the "instance variables" of classes called by the servlet. Say I have an instance of class MyApp created in, and therefore local to, a servlet Method, . Is that class thread safe? Now I have an instance of class MyApp stored as a field (i.e. class) variable. ... |
26. Servlet threading vs. implementing threads coderanch.com |
27. servlet creating a new thread coderanch.comHi, I want my servlet to start a new thread that will call one simple method once a day and sleep the rest of the time and run indefinitely. At the moment I have got the code for creating the thread in the init() method of the servlet: public class MyServlet extends HttpServlet implements Runnable { private Thread thread = (Thread) ... |
28. invoking a thread from a servlet coderanch.comhi all, i have a question regarding invoking a thread from a servlet. i have a servlet that has to do long processing and can't respond client fast. the problem in this is the proxy times out before servlet can come back with a response and then users see "proxy time out error". we want to ignore it. we want to ... |
29. Threading in a Servlet coderanch.comMy learned colleagues, i have a small problem that i would like to pass around. My basic premise is that i would like to use my applet to access data in a database and display it. To do this i have my small applet accessing a servlet every minute which then accesses the database. This works well however the applet is ... |
30. threads on servlet? coderanch.com |
31. Thread in Servlet coderanch.com |
32. threading in servlets?? coderanch.com |
33. Single Threaded Servlets coderanch.com |
34. Servlets and Threads coderanch.comBon Journo Meo Pusssy Caaaats, Hope everyone is well. I was wondering if someone could help me with the thread model that servlets use. I understand that multiple threads can execute accross the same code and thus interfere with one another. I was wondering though, apart from the SingleThreadMethod, is the only other way to deal with this to synchronise methods ... |
35. Can servlets use Threads coderanch.com1. Sure - but not recommended for beginner 2. NO! - constructors are handled by the servlet engine automatically. 3. NO! - another task handled by the servlet engine. 4. Only if you want to kill the server entirely - may hit a security exception instead. 5. Not a good idea, put common code in a helper class. 6. As I ... |
36. Servlet Thread Model coderanch.comYou have to have a major shift in your programming viewpoint and habits to use servlets. 1. HTTP is inherently state-free - it is up to your program to track the state of each user and remember it between requests. Typically this is accomplished with the HttpSession class. The servlet engine provides methods to associate a "session" with a particular user. ... |
37. Threads problem in Servlets coderanch.comIm facing problem of threads while calling different methods of different classes from Servelts. My scenario is that there could be different users those could access the same servlets simoltaneously & from the service method Im callind different methods of the beans/simple classes which are interactig with database also. If more then two users are accessing the same screen or other ... |
38. Threads in servlet coderanch.comI have a web application whose purpose has been to display data from the database. I now need to add the ability for users to enter data. I have a JSP with a button to add an item to a list. When this button is pushed, I popup a new window, allowing the user to enter the required information to create ... |
39. fork a thread from a servlet coderanch.com |
40. Configure the Maximum number of threads in a servlet coderanch.com |
41. Is it allowed to create threads inside servlets? coderanch.com |
42. creating a new thread from servlet coderanch.com |
43. Java gurus please! Detecting browser close, Framesets, and Threads in Servlets coderanch.comNeed advice from all the Java gurus.. (Mr. Brogden appears to be quite active on the forum Who hasn't run into this problem at one time or another! Problem: Detecting when a user who is logged in closes the browser without logging out, and updating a field in database to show the user as having logged out. (Now, I know there ... |
44. Thread code in a Servlet coderanch.com |
45. Can we control number of threads of a servlet instance coderanch.com |
46. Problem in handling threading issue in servlet coderanch.compublic string execute (req,res){ call method of another class instance method()// for db access } This is thread safe if it is a method in another class that is declared and instaniated within a service method. It is not thread safe if it is another method within a servlet class, or thread class. |
47. how to write a threaded servlet? coderanch.comHi Archana, i don't think we can continuously keep flushing the data to the browser. if you use a loop which cannot be terminated, then it is definitely going to get hanged because it is going to keep the container busy always. One thing you can do is to call the servlet for every few seconds/minutes. |
48. Threads in a Servlet coderanch.com |
49. Threads in Servlets coderanch.com |
50. thread in servlet problem coderanch.com |
51. no of threads for servlet coderanch.com1. Is there any limit on maximum no of threads that would be created for a servlet by default? (I'm using Tomcat 3.2) If yes, what is the value of this limit? 2. How can I change this limit in Tomcat 3.2? Is there any difference in the configuration of this limit for Tomcat 3 and Tomcat 4? 3. If I ... |
52. Single Threaded Servlet coderanch.com |
53. Starting threads within Servlets coderanch.com |
54. servlets and threads coderanch.com |
55. Servlets & threads coderanch.com |
56. Servlets and Threads coderanch.comServlets have to be made thread safe. The servlet container runs two or three or a thousand user requests through the same servlet at the same time, so you have to be careful. The simplest rule is to not use any member variables. The arguments passed to a method and the local variables defined within a method are all safe enough. ... |
57. using util class that create thread in servlet coderanch.com |
58. Thread in Servlets coderanch.com |
59. Threads in Servlets coderanch.comI have the same doubt. There is a funcionality on my system that is Download of reports. The thing is that the download files are quite big (about 50 MB) and are created on the fly. Because it can take a while to download the file, I created some methods to show the status of the download. So, to do that, ... |
60. Is it a good idea to spawn a thread from a servlet? coderanch.com |
61. Doubt in Servlet threading coderanch.com |
62. Thread Persistance In A Servlet coderanch.com |
63. Servlet to control threads coderanch.com |
64. Threading and Servlets: Best Practise coderanch.comHello; I have a few processes that get started in servlets in my application. In all cases the servlets instantiates a class which contain methods to manage the process required. The problem I am finding is the application is starting to get slow from a user perspective while some of these processes are going on. I have 2 questions: 1. What ... |
65. Thread in a Servlet coderanch.com |
66. threads in servlets coderanch.com |
67. how/who start main thread of servlet coderanch.com |
68. Will you ever really need to spawn separate thread if you are writing servlets? coderanch.comHere's the thing. Let's say I have a servlet that aacepts some query from the user and runs it against the database, and if I wanted to allow multiple queries to run simultaneously, I don't need to explicitly spawn a new thread right? When a request is sent to the app server, it will automatically spawn a new thread correct? So ... |
69. Servlet Threading coderanch.com |
70. Thread running withing a servlet coderanch.comHello! I tried the follwoing simplest code of running a thread in a servlet but it does not seem to. import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.ServletException; import java.io.IOException; import java.io.PrintWriter; public class TestServlet extends HttpServlet{ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{ new show(resp); } } class show extends Thread{ private HttpServletResponse response; show(HttpServletResponse resp){ response = ... |
71. TimerTask, Threads and Servlets coderanch.comOriginally posted by Dale DeMott: It doesn't look like this solution provides me with a way of scheduling a task that will occur within a web container. I'm looking for something that I can control by restarting my web container. This way its safe for the company. What did you see in there that leads to to believe that this couldn't ... |
72. problem regarding servlets+ threads coderanch.com |
73. Spawning threads from Servlets? coderanch.com |
74. Threading in servlet coderanch.comI have a basic question about threading in servlet. If the servlet implements the singletread interface then the container generates multiple instances of the servlet making sure that one client request is served by a single instance and no two threads run the servlet's service method. If you do not implement it then the service method is multithreaded by default. So ... |
75. Threads for a servlet coderanch.comThis is normally a configuration setting for the container. In general are stored ina thread pool and are taken from the pool to serve client requests. In theory it would be possible for all of the threads from the worker thread pool to be accessing the same servlet with no ill effects. Consider the Front Controller pattern, for example. When the ... |
76. Advise - Servlet + Understanding Thread and Instance coderanch.com |
77. Servlets&Threads coderanch.com |
78. worker threads in servlet coderanch.com |
79. servlet with a worker thread coderanch.comHello All I don't know whether to post this here or in the multi-threading section so I'm starting here I have a servlet that is the backend for a site where people enter zipcodes as part of some data they're entering this data goes in a database for each zipcode I want to go to one of the weather sites (weather.com) ... |
80. Java Servlets and Threads - Am I in trouble ? coderanch.com |
81. why servlets are multi - threaded coderanch.com |
82. creating threads in 'init' for servlet (advanced) coderanch.com |
83. Servlets and Threading coderanch.comSo I'm new to servlets and relatively new to Java as well. I'm currently reading Head First Servlets, and I can't seem to wrap my head around the threading issue. The book explains that there is only one instance of a servlet, and each request spawns a different thread. So here's where I'm hitting my head against the wall. If Tomcat ... |
84. Servlet run as a thread? coderanch.com |
85. Servlet and threads coderanch.com |
86. Thread pool of servlet coderanch.com |
87. Thread in Multithreaded Servlet coderanch.com |
88. Servlet 3.0 Async and Threads coderanch.com |
89. how to get refrance of a current executing thread of a servlet coderanch.com |
90. Creating a Thread in a Servlet coderanch.com |
91. Running a thread in background in servlet coderanch.com |
92. Clear servlet thread coderanch.com |
93. Thread Issue In The Servlet coderanch.comHi, In a Servlet ,I want to execute a method as a background process.I used this method inside the Servlet becase It use the request object.So I create a Thread through a inner class inside the servlet. The Thread execute and works fine upto the servlet has not been redirect to jsp,The moment it redirect the run() method from Thread returns ... |
94. How to create seperate Thread in servlets? coderanch.comimport javax.servlet.*; import javax.servlet.http.*; public class ActionServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Some logic try { process1 = runtime1.exec("C:\\exefolder\\Template.exe "); System.out.println("Template.exe is running "); } catch(Exception ex) { System.out.println(ex.toString()); } //Logic continues } |
95. When will be single threaded servlet mandatory to implement? coderanch.comWhen the servlet API was initially being worked out, there were a number of things that people thought would be a good idea for one reason or another. I think the STM was put in because the vast majority of programmers had only worked with "desktop" style applications where there was only one user. Understanding the consequences of multiple simultaneous requests ... |
96. Separate thread for a complex tasks in a servlet coderanch.com |
97. Async servlets (Servlet 3.0) and threads coderanch.comHi ranchers. I have some trouble understanding the added value of async servlets / filters. Here is the deal: I have a servlet, and it has to wait for some action, like a return from a database or a web service endpoint, which can take time. So, instead of wasting the thread serving the request, my servlet starts async processing, and ... |
98. How to use Threads in Servlets? coderanch.comWelcome to the JavaRanch, Aatish! DON'T spawn threads in servlets. It's explicily forbidden by the J2EE standard. There's a reason for that. Web applications are not like traditional client/server applications. Web applications do not run continuously. A web application receives a request from the client (browser), processes it, returns the results and that's it. Each request/response process is independent and it's ... |
99. Thread.sleep in servlet? coderanch.comTo keep track of application i have used multithreading in servlet as need was to run program on deploying, so contextlistener is used there. Some unexpected behaviors are facing in jboss 4.0 while (true) { if(counter==20) { counter=5; } ApplicationStatusCheck Listener = null; Calendar now = null; Listener = new ApplicationStatusCheck(); now=Calendar.getInstance(); if (Listener == null) { System.out.println("Container Stopped at " ... |
100. servlet and thread clarification coderanch.comHi, We are uploading a file to server and reading the uploaded file and we are reading the file and inserting into database. When it is a large file insertion takes some time during which user can cancel the operation and we need to stop the process. We are planning to have a thread created for insertion. Suppose the thread is ... |