maff maff - 1 year ago 51
Java Question

Try-with-resources and return statements in java

I'm wondering if putting a return statement inside a try-with-resources block prevents the resource to be automatically closed.

try(Connection conn = ...) {
return conn.createStatement().execute("...");
}


If I write something like this will the Connection be closed? In the Oracle documentation it is stated that:


The try-with-resources statement ensures that each resource is closed at the end of the statement.


What happens if the end of the statement is never reached because of a return statement?

Answer Source

Based on Oracle's tutorial, "[the resource] will be closed regardless of whether the try statement completes normally or abruptly". It defines abruptly as from an exception.

Returning inside the try is an example of abrupt completion, as defined by JLS 14.1.

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