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Newsgroups: comp.lang.java.programmer
Date: Thu, 28 Feb 2019 13:49:33 -0800 (PST)
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Subject: Re: it's Closeable, but I don't want to close() it yet.
From: bursejan@gmail.com
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Xref: csiph.com comp.lang.java.programmer:38765

Hint: Don't use MyClass.class.getResourceAsStream.
Use getResource which gives you an URL, and provide
this to ImageIcon.

Swing will create a background worker, and load the
ImageIcon for you. getResource doesn't throw
any error, but it might return null:

   URL url =3D clazz.getResource("relative path to icon");
   if (url!=3Dnull) {
      ImageIcon icon=3Dnew ImageIcon(url);
      /* do something with the icon,
         it should already be loaded */
   } else {
      /* your setup is wrong or programming error
         wrong class or wrong relative path */
   }

On Thursday, February 28, 2019 at 9:11:41 PM UTC+1, Eric Douglas wrote:
> On Wednesday, February 27, 2019 at 10:52:01 AM UTC-5, Andreas Leitgeb wro=
te:
> > In my application there exists an entity that is Closeable.
> > It is kept in some class, and other parts of my application
> > request a ref to the entity and do actions on it, then drop
> > their ref, leaving the entity intact.
> >=20
> > Everything runs fine, except eclipse warns me about spots
> > where the entity is requested, used, and then dropped.
> > Eclipse thinks it might need to be close()d.
> >=20
> > Apart from ignoring the warning per eclipse settings or
> > adding @SuppressWarnings, is there maybe a way to tell
> > the compiler that a certain ref is not meant to be close()d?
> > Letting it know that - despite the entity's ultimate fate of
> > being eventually closed - this is not yet the time&place for it?
>=20
> Here's where it gets ugly.  I've had the "Potential resource leak" error =
just turned off, now I'm trying to turn it on and change code to make it go=
 away.  I have a class with class level final public static ImageIcon varia=
bles.  I initialize each ImageIcon in a static block which calls MyClass.cl=
ass.getResourceAsStream() to open an InputStream to an image file which is =
packaged into the jar (so if this ever gets an error you've got serious pro=
blems).  I then pass that InputStream into another method in a utility clas=
s which uses ImageIO to generate the ImageIcon.  That method closes the str=
eam.  Eclipse complains the stream may be leaked in this class.  I take the=
 close out of that class and try to change this to use the try-with-resourc=
es.  I previously needed no try statement in this static block.  When I wro=
te a try-with-resources for a SQL Statement it didn't ask for any exception=
 clause, but here it's telling me I need to catch IOException.  Now of cour=
se my assignment of the ImageIcon must be inside this try block, and if I a=
dd a catch clause it's complaining it may not be initialized, so I have to =
initialize it to null in the constructor and remove the final.