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Asked: 2026-05-13T17:43:09+00:00

pseudo code to explain my self better. I’m learning Java at this point in

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pseudo code to explain my self better. I’m learning Java at this point in time.

if I have a method

public resultSet getEverything() 
{    
   resultSet rs = blabla;    
   return rs 
}

I can’t rs.close() as I need to use it in the method I retrieve it
hence then I will use it, and maybe ‘close’ the new resultSet I create.

What happens from the previous resultSet?
Is it left to be collected by the garbage collector?
Does it close itself when I close the ‘new’ resultSet?
Does it have any impact on code efficiency/performance?

Any feedback would be greatly appreciated 🙂 as this has confused me a bit. It is more of an OOP question rather than Java I think.
Thanks!

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1 Answer

  1. Editorial Team

    You should not be returning a java.sql.ResultSet from a method. It should always be created, mapping into an object or data structure, and closed in the scope of the method in which it was created in a finally block.

    A java.sql.ResultSet is associated with a database cursor, a scarce resource. You don’t want to keep those open for a long time.

    Garbage collectors do not clean up result sets, statements, or connections to databases. It will remove the reference from memory, but the cursor or connection will still be open on the database side. It’s your responsibility to close them properly or you’ll exhaust the supply.

    An object, data structure, or CachedRowSet is the right thing to return.

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