java - Resource Leak (Resource out of scope) -

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hi here couple of lines in code. 

func(){ .... ....  objectinputstream in = xstream.createobjectinputstream(is); return (useraccountvo)in.readobject(); }

now giving warning "leaked_resource: variable in going out of scope leaks resource refers to".

can please explain it?

and 1 more point. how got fixed via this:

try(objectinputstream in = xstream.createobjectinputstream(is);) {                     return (useraccountvo)in.readobject();                 } catch (ioexception e) {                     s_logger.error(e.getmessage());                     return null; }

in former case, not closing resource 'in' , may result in memory leak. therefore warning. while in later case, have put 'in' instantiation within try block adds implicit 'finally' close resource.

hope clarifies.


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