How to stop a singleton class being clonable ?

Do we have any way to stop clone method being invoked on a singleton class.
One way I guess is to implement clone method and throw an exception inside the method.

jwenting wrote:
georgemc wrote:
Why bother, though? Don't you trust your fellow developers not to do stupid things?why should I trust them to not do stupid things when I don't even trust myself to not do stupid things? >:=)Because trusting them not to do stupid things would actually be a stupid thing :)

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If you don't have access to the parent frame, a "hack" that usually works:
Frame frame = Frame.getFrames()[0];
if (null != frame && frame instanceof JFrame){
JFrame jf = (JFrame)frame;
JDialog jd = new JDialog(jf, "title");
... code here ...
As each JFrame (or Frame) is opened, its stored in the array of Frames that you can get. Same thing with Dialog.getDialogs(). Almost always, at least so far for me I've never had this problem, the [0] index is the main window opened, or the parent/top frame. I'd put the check in there to be safe and make sure its a JFrame and usually you'll only have the one JFrame.

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How to stop volume icon from being displayed randomly

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I have to stop the idoc and give a suitable status message over there.
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Hi,
Check the below link
https://forums.sdn.sap.com/click.jspa?searchID=11810720&messageID=3032674
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IDOC_DATA
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PERFORM LOGIC...
ENDLOOP.
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PERFORM updatestatusidoc.
endform logic.
like this in
form updatestatusidoc.
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>denotes success
t_idoc_status-msgid = 'ZXXX'.
t_idoc_status-msgno = '000'. "
t_idoc_status-msgv1 = itab-field.
APPEND t_idoc_status.
ELSEIF subrc = 1.
t_idoc_status-docnum = f_idoc_contrl-docnum.
t_idoc_status-status = c_idoc_status_error.
t_idoc_status-msgty = 'E'. "denotes --->error
t_idoc_status-msgid = 'ZXXX'.
t_idoc_status-msgno = '001'. "
t_idoc_status-msgv1 = itab-field.
APPEND t_idoc_status.
endif.
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this has to be done to make the idoc to trigger error mode.
Regards,
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How to implement a singleton class across apps in a managed server}

Hi ,
I tried implementing a singleton class , and then invoking the same in a filter class.
Both are then deployed as a web app (war file) in a managed server.
I created a similar app , deployed the same as another app in the same managed server .
I have a logger running which logs the singleton instances as well.
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public class Test
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public final class Filter implements Filter
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}Edited by: Tom on Dec 8, 2010 2:45 PM
Edited by: Tom on Dec 8, 2010 2:46 PM

Tom wrote:
Hi ,
I tried implementing a singleton class , and then invoking the same in a filter class.
Both are then deployed as a web app (war file) in a managed server.
I created a similar app , deployed the same as another app in the same managed server .
I have a logger running which logs the singleton instances as well.
But am getting two instances of the singleton class in the two apps - not the same .Two apps = two instances.
Basically by definition.
>
I was under the impression that , a singleton is loaded in the class loader level , and since all apps under the same managed server used the same JVM , singleton will only get initialized once. A class is loaded by a class loader.
Any class loader that loads a class, by definition loads the class.
A VM can have many class loaders. And far as I know every JEE server in existance that anyone uses, uses class loaders.
And finally there might be a problem with the architecture/design of a JEE system which has two applications but which is trying to solve it with a singleton. That suggests a there might be concept problem with understanding what an "app" is in the first place.

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http://support.apple.com/kb/HT5570
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How to stop a singleton class being clonable ?

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