描述java Web应用程序的启动

Question

I am having to work on a poorly written, ten year old humongous web application, deployed on IBM Websphere. The problem is it takes forever (almost 40minutes) to start. I have used JVM monitor in the past to analyze a running application, and memory analyzer to analyze heap dumps, but I have never worked on startup issues like this.

Is there a way to profile/analyze the application while it is starting up, without making code changes? I searched SO and I found this post. I didn't quite get how to get VisualVM to work with a web application that has not yet started.

Can anyone help me here - is it possible to use VisuaVM or any other tool (preferably free) to monitor a web application that is starting up?

Answer 1

JvisualVM is a great tool. To monitor you application you should first start your container . After that, add your application to the container and start to profile and trace your application packages .

Here a tutorial.

http://visualvm.java.net/api-quickstart.html

Now, if you are using IBM tools, you should already have a licence for IBM Introscope ( http://www-304.ibm.com/partnerworld/gsd/solutiondetails.do?solution=23517&expand=true )

It's focus on IBM Websphere. See if your company has it, and try it.

Also check this out

http://www.ibm.com/developerworks/java/jdk/tools/healthcenter/#download

Profile tool for IBM tools (including websphere). I think this could solve your problem. It's free and seems very close to jvisualVM.

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Edited:

Another tool for profiling is new relic

http://newrelic.com/

I've seen some good reviews about it.