load-on-startup problem tomcat

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I want to load a class on tomcat startup which will actually initialize variables in other classes.

i have edited the appName/WEB-INF/web.xml as follows

<servlet>
    <servlet-name>LoadConfigurations</servlet-name>
    <servlet-class>Loader.LoadConfigurations</servlet-class>
    <init-param>
      <param-name>env</param-name>
      <param-value>dev</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

and i have placed my servlet LoadConfiguration in /appName/WEB-INF/classes

how do i check whether the servlet is beig called or not ? because when i try to display the value from initialized class it returns null

There are two problems:

  1. The compiled class needs to go into a folder structure base on the package name. In your case a folder called Loader

  2. In order to call the servlet, you need to add a <ServletMapping> to your web.xml file

java - load-on-startup problem tomcat, There are two problems: The compiled class needs to go into a folder structure base on the package name. In your case a folder called Loader. In order to call  (The annotation looks correct, so the problem is probably with your container configuration.) – chrylis -on strike-Sep 15 '13 at 4:15 Thanks for you support. My Servlet version API is 3.0 and I use the tomcat 7.

The container should call your servlets init() method when the servlet is initialized. Implement/override that method and try writing something to the log from there.

How to Fix Tomcat Stuck at Startup Issue?, Apache Tomcat getting stuck while starting Lately, I was working on Tomcat 9 Catalina.load Initialization processed in 1341 ms 22-Sep-2018  The problem is that my web app has to talk to some native libraries (via JNI) and those libraries do not handle errors that gracefully so if I try to start Tomcat and the native calls fail Tomcat startup halts partway through and does not start.

This is the solution for Tomcat 7.0

Step 1: Create war file for your webapp/servlets. If you are using Eclipse, File->Export->Web->WAR file, and save it to a known location.

Step 2: Find out the home folder for your tomcat. For that, go to tomcat/apache-tomcat-7.0.41/bin and execute ./startup.sh This will print out couple of global variable names. Note down the one for CATALINA_HOME.

Step 3: Copy the war file from Step 1 in CATALINA_HOME/webapps

Step 4: Next, Create an xml file in CATALINA_HOME/conf/{Engine}/localhost/MyServlets.xml :

<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<Context deployOnStartup="true" docBase="/home/ubuntu/Downloads/apache-tomcat-7.0.42/webapps/" reloadable="true">
<Manager pathname=""/>
</Context>

Change docBase to point to location where you copied the war file in Step 3.

Now, you can go go to tomcat/apache-tomcat-7.0.41/bin and execute ./startup.sh. Your servlets will be automatically started. Hope this helps.

load on startup in web.xml, The load-on-startup element of web-app loads the servlet at the time of deployment or server start if value is positive. It is also known as pre initialization of servlet. This is an issue using the latest version of Tomcat 9.0.16. There were some recent changes in this version of Tomcat. However, we can resolve this issue with the following.

This is how I fix it on tomcat 9:

  1. Edit the conf/context.xml file and add reloadable="false" to the <Context> tag.

    <Context reloadable="false">

  2. Edit the conf/server.xml file and add deployOnStartup="false" to the <Host> tag.

    <Host appBase="webapps" deployOnStartup="false" …>

Tomcat server startup problem Fixed, Tomcat server startup problem Fixed. Javaweb4u. Loading Unsubscribe from Javaweb4u Duration: 3:40 Posted: 20 Dec 2014 The load-on-startup element of web-app loads the servlet at the time of deployment or server start if value is positive. It is also known as pre initialization of servlet. You can pass positive and negative value for the servlet.

How to Run Java Program Automatically on Tomcat Startup • Crunchify, Recently I wanted to start my standalone Java Application on Tomcat Startup. Also found so many When tomcat starts, all Servlet loads in web container and init method of Servlet loaded first. Any java How to fix java.lang. Created attachment 31563 Patch for tomcat 8 Currently when a servlet with load-on-startup >=0 fails its startup, the context startup is still considered as OK. With some webapps (like spring-based ones with a DispatcherServlet), this makes no sense at all : if the servlet failed its startup, the webapp is unuseable and it would be more sensible to have tomcat mark the context as failed.

144919 – load-on-startup invokes servlet's init twice, MyServletTest</servlet-class> <load-on-startup>1</load-on-startup> </servlet> I verified that it is not a tomcat problem by copying the entire webcontext to a  Windows 8 and 10. Users of Windows 8 and 10 can disable startup programs via the Windows Task Manager.. Press the Ctrl+Alt+Del keys at the same time.; Click on Task Manager.; In the Task Manager window, click the Startup tab.

Tomcat: The Definitive Guide: The Definitive Guide, also specify a load-onstartup value, Tomcat will precompile the JSP at startup will never actually be bought, are a real problem for even medium-sized sites. Welcome to the Apache Tomcat ® 10.x software download page. This page provides download links for obtaining the latest version of Tomcat 10.0.x alpha software, as well as links to the archives of older releases.

Comments
  • try keeping logs or System.out.println("Inside Constuctor") inside constructor and init() method start and end. check if you are getting the logs.