Can i use jacoco for web application...if can...?please tell me the steps

[Alex Revanth]

i am searching to code coverage for my web application written in java.I need to do the coverage by running my application. Is it possible...?by using jacoco with ant..?

[Marc Hoffmann]

You can create code coverage for any program with runs on a JVM.

See our Ant documentation how to run Java programs with JaCoCo:

https://www.jacoco.org/jacoco/trunk/doc/ant.html

Cheers,
-marc

On 2018-09-13 11:53, Alex Revanth wrote:

i am searching to code coverage for my web application written in java.I need to do the coverage by running my application. Is it possible...?by using jacoco with ant..?

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[alexrev...@gmail.com]

Thank you sir,..i used java agent in my tomcat server to coverage my code by starting the tomcat but....in that can i start and stop the coverage whenever i needed is there any way to do it ...?

[Marc Hoffmann]

You can either enable JaCoCo’s JMX interface or use a remote output mode like tcp server. See documentation:

https://www.jacoco.org/jacoco/trunk/doc/agent.html

Both allow collecting execution data at any point in time. Also the coverage status can be reset.

Regards,

-marc

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[alexrev...@gmail.com]

Thank you sir..
But when we need to use tcp server and tcp client....?can you explain me....?

[alexrev...@gmail.com]

is there any way to start the java agent listening to start code coverage in the middle of the running server and to stop ....?

And how the coverage executes inside the server....?does..it makes more memory...to take the coverage...?and what is the working process of the jacoco agent in the tomcat server,....?can you explain this...? I am struggling a lot..of how it is working...

[Henrik Horneber]

The agent starts together with the vm and will collect coverage from then on while the vm is running. 

You can tell the agent to reset collected coverage while it's running though. In other words, a workable approach is to start the server if not running, deploy your application if not yet deployed--then reset the agent, run your tests and then ask the agent for coverage info. 

Coverage info will consume some memory obviously. 

Your additional questions go too deep into the internals for me to answer. 

Basically all information given here is also covered by the documentation. 

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[alexrev...@gmail.com]

Thank you Henrik,

But i need to know how this works and how the coverage works because i am going to add the agent too my tomcat server ....I doesn't to get coverage all the time,I get whenever i needed so if i added the agent to my server ,it runs always to get the coverage this will makes an unwanted memory or unwanted server running in the server....is there any way to solve this problem....?
For this problem i need to know how it works and how much of memory does it takes to run the process of coverage..?