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program arguments vs VM arguments

gudii9
gudii9 asked
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Last Modified: 2017-04-04
Hi,

In eclipise when i right click on a junit test class and select run configuration then there is Test, Argument, Classpath, JRE, Source, etc tabs.

under arguments tabs there are two options like Program Arguments and VM arguments.
when to use which one. what is use of each one. please advise
args.png
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VM arguments are commands used to start Java itself.  You can do things like increase the heap memory by passing parameters there.

i see my friend passing VM argument like

-Dorg.xyzProj.stub.enabled=true

Not sure why junit test need above kind of stub enabling to by pass DAO and Database etc call through VM arguments?
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Commented:
That's a good question - certainly unusual to use that sort of parameter passing through the VM, but why they're doing that, you'd need to ask your friend.  But that is definitely a way to pass a value to Java itself (i.e the VM) and not your code.

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