Problem running Java applications on Lubuntu 12.10

[Yorvyk]

On 28/10/12 02:37, Aere Greenway wrote:
> On Sat, 2012-10-27 at 18:55 -0600, Aere Greenway wrote:
>> On Sat, 2012-10-27 at 12:07 -0600, Aere Greenway wrote:
>>> All:
>>>
>>> I just noticed something running Java applications on Lubuntu
>>> 12.10, and it probably didn't do it before the latest updates I
>>> installed today (which included updates to the Java JRE/JDK's.
>>>
>>> When I run a Java application, there is no indication of it (or
>>> any of its sub-windows) in the taskbar!
>>>
>>> The application is obviously there, and works, but it doesn't
>>> appear in the taskbar.
>>>
>>> When the Java application shows a modal dialog box, that dialog
>>> box gets window focus, but when you finish with it (the dialog is
>>> closed), the main application does not get re-focused.
>>>
>>> I can't get to it via Alt-Tab.  The only application in the
>>> taskbar is Evolution mail.
>>>
>>> The only way I can get back to my Java application main window,
>>> is to actually click on the Java application's window, and I have
>>> to do that every single time it uses a sub-window, which is a
>>> real pain!
>>>
>>> --
>>>
>>> Sincerely, Aere
>>>
>>>
>>
>> All:
>>
>> I have a bit more information on this problem.
>>
>> On one of my upgraded Lubuntu systems (12.04 to 12.10), I had
>> installed specifically the open Java 6 JRE/JDK (instead of the
>> default JRE/JDK, which in 12.10, is Open Java 7).
>>
>> On that machine (which doesn't have Open Java 7), everything is
>> fine - the Java applications are displayed on the taskbar.
>>
>> So it appears to be a problem with Open Java 7.
>>
>> I did still more checking on the machines that had the problem.
>>
>> I found that the problem (no Java applications in the taskbar) was
>> present after the upgrade, and before any Java updates.
>>
>> After applying the Java updates (to both Java 7 and Java 6), the
>> problem was still there.
>>
>> So the problem was not introduced by the recent Java updates.
>>
>> Sincerely, Aere
>>
>>
>
> All:
>
> I have successfully worked-around this problem by removing the
> default-jre and default-jdk packages, along with the specific open
> Java 7 packages.
>
> Of course, at some point, it will cause problems for me again when I
>  eventually have to use open Java 7.
>
> But maybe the problem will be fixed by then...
>
A quick google shows that this has been a problem with java apps for
some time.  There doesn't appear to be any single solution.