I am working with a ubuntu web server, where I have tomcat 8 and running a web application on tomcat. Recently I have faced some problem with cpu uses 100%. When I restart the tomcat server it is running good, but after one day or a few hour again same problem arise ( 100% cpu use) and that problem make my site slow. When I see the process list with htop command then i see so many process like
/opt/java8/jre/bin/java -Djava.util.logging.config.file=/opt/tomcat8/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoader
The website is a live eCommerce website and average user in every moment is around 100.
The server is a aws ec2 server where a tomcat and a java application inside the tomcat is running. The database (MySql) is in an another aws RDS server.
What can i do in this situation? Please help.
Related
I try to deploy my Java project Apache Tomcat server but sometimes it gets down and returns me this page
Tomcat is installed on the Digitalocean's Ubuntu 14.04 and droplet's properties are 512Mb/1CPU, 20GB SSD Disk, 1000 GB transfer. I took the lowest option for test purposes. The site is visited by nobody except me and from the graphs I observe that the server is not overloaded at all. Most of the time everything works fine until suddenly the server returns 503. After I restart it keeps working fine again till the next 503 error in several days. I'd like to know what could cause this error: my mistake on configuring the server or maybe problems on server side?
That mean tomcat is not running. You can use the alias command to up the tomcat service or just go in the current directory and start the service.
Example: # tomcatup
/opt/tomcat8/bin/startup.sh
Currently I am facing application (JAVA RMI based) hang situation and RMI client GUI become Black.
In the application log does not record any exception and client / server communication has completely stopped at one stage. Once user restart the application it will resume the operations.
Initially we thought it was due to a JVM issue since we saw a dump file during this hang situation. This Dump file was not able to open or copy during this time, it is disappearing once we closed the application. We re-installed the JVM but this issue still hits intermittently.
We noticed this issue started few months after the production cutover and we did not come across during our testing and the initial few months of live cutover.
Application background
-RMI client/server based compiled on java 1.7_55
-OS (client Win7 32 bit & Server Win 2008 32 bit data centre), Win2008 runs on VMWare
-DB MSSql server 2008
It would be great if someone can advice me on this.
Thanks and Regards
Chamantha
Hi Stack Exchange Experts,
I am working on a task, that requires me to communicate with another applications on the same machine.
the machine is a Windows 7 laptop.
There are in total 3 applications on the laptop. Their specifications are given below:
First application is coded in java and runs on a local Tomcat at port 6060
Second application is coded in java and runs on Tomcat at port 8080
Third application is coded in java and does not have Tomcat. It is a static web application.
Since application 1 and 2 are running on Tomcat, I have used HTTP to commicate with each other. However, since they are on the same machine, is there any ohter way for them to commincate with each other?
Application 2 needs to communicate with application 3. What is the best way for this communication.
Please let me know if you require any further information to answer my queries.
Thanks.
I have developed a Fusion Web Application on Oracle ADF.
Now i have deployed this Application on Weblogic Linux 64bit server and test this application using JMeter.
Initially i have test this application with 50 users then 100 and 500 users.
Problem is this, Server Memory and Swap space is not getting free.
It is getting increase even i run the 10 users test multiple times
I know this sounds like a generic question, but I need some guidance.
We have a distributed system with Java swing client, Glassfish 3.0.1 as application server and PostgreSQL as database. We are using hessian protocol for communication with the Glassfish 3.0.1 server.
There are around 5 users using the client simultaneously. Everything is running fine, until all users say that their client stops responding for 10 seconds and then it continues to run fine for 15 minutes for example. And then the same thing happens. When I restart the server they say it is fine, but after half a day, again the same thing happens. I looked at the database logs, and I don't see queries above 1 second. I think the problem is connected with the communication to the Glassfish server(all clients cannot communicate to the server at the same time).
How could I approach the problem?
P.S When glassfish stops responding, I can't even open the index.html page properly.
Greetings,
Petar