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How to increase number of threads in tomcat thread pool?
(3 answers)
Closed 6 years ago.
I am working on spring project. I put Thread.sleep(60000) on one api to check thread safety. If I call that api then all other apis wait for that time. I thought every api request processed by separate threads. So what is the reason behind this behaviour?
Issue resolved when I set maxThreads in tomcat server.xml file.
Thank you all for helping me resolve this issue.
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Is it safe for a Java servlet to spawn threads in order to satisfy a request?
(5 answers)
Closed 6 years ago.
Spawning threads inside web servlet is not the correct way. Executor Services are best prescribed for asynchronous operations (is it?)
If one needs to perform multiple parallel operations and combine the results in the same webservlet response, then what would be a good approach?
There are many ways to implement multiple servlet responses using Spring MVC concept or struts frame work it can be done easily.
Just go through the following link
http://www.javatpoint.com/struts-2-interceptors-tutorial
http://www.tutorialspoint.com/spring/spring_web_mvc_framework.htm
This question already has answers here:
How to run a background task in a servlet based web application?
(5 answers)
Closed 6 years ago.
I have a webpage written with jsp and Java Servlets on a TomCat-Server.
I am very new to the whole JavaServlet thing. In the past I developed often in php. There it is very simple to create a Cronjob.
I just used CRONTAB and called a .php-file which did the job for me.
But how do I do this with JavaServlets? I read that some say the quartz-library would be good. But I didn't really get how to use this. I don't know where to start.
I know that this question isn't very detailed and I can't provide any code, because there is no. I just wonder if there is any possibility to just call a JavaServlet like I can in php with crontab.
My goal is to call a method every five minutes on my server. Most times this method will finish very quickly, but sometimes it will execute another .jar and last many minutes.
Any advice would be very helpful for me. Thanks!
I recommend that you do take a look at Quartz when you have time.
We have found it to be quite useful for handling cron-like task running.
This question already has answers here:
Is there a reason for never closing a JDBC connection?
(3 answers)
Closed 8 years ago.
a question just came to my mind when I noticed that I didn't close the connection to the database in many classes of my java application.
I wonder if this can affect my entire OS as the time goes by.
Thanks in advance.
To the Database, no. Depending on the driver and adaptor for your language, it will either automatically close itself after the request is complete or (most likely) just timeout after a while. It will continue to listen for your application's connection after the application has completed it's requests thus consuming more resources on the server until the DB decides it's time to end that connection.
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Java: Global Exception Handler
(6 answers)
Closed 8 years ago.
Is there any method to handle/catch all exceptions thrown by a Java application, without spamming costly try{}catch(Exception e){} statements everywhere?
For example, PHP has the function set_error_handler().
Back story - Despite tough testing, sometimes bugs can get through, and users are always less than cooperative with helping to fix these.
Ideally, I'd like to hook the application up to a web service facility that can keep track of any stack traces thrown by a user's application.
Perhaps you're looking for Thread.setDefaultUncaughtExceptionHandler() ?
This question already has answers here:
Java Servlets threading model
(3 answers)
Closed 9 years ago.
Suppose 10 clients requests for a Servlet. How many servlet instances are created? Also will it create any concurrency modification problem if each instance is trying to make changes? Please help.
Only one instance of servlet exist (per classloader) , and each request will be served on its own thread
So is there any thing that is shared amongst requests you need to manage synchronization
Servlet is instanciated as singleton in servlet container, thats why we can't declare global variables in it.