Java SWT app fails to render from AIX on Cygwin X

[Jon TURNEY]

Stephen McCants wrote:
> Hello,
> 
>     I've run into a problem with Cygwin X that I'm at a loss as to how
> to debug further.  I have a trivial test case that uses Java and SWT,
> and it creates a simple dialog box (source code provided below - I
> found it as an example on the internet).  I have two other machines -
> one is a Linux box (RHEL 4) and the other is an AIX machine (AIX 5.3).
>     I start my Cygwin X server so that it displays its windows side by
> side on the desktop with Windows' windows.  I then ssh with X11
> tunnelling (using Putty) to the Linux and AIX boxes.  Both can send
> back xterm windows without problem.  However, when I run my simple test
> program, it works on Linux and fails on AIX (draws an ugly unresponsive
> gray box that I can drag around the screen but not close - it doesn't
> have the buttons).  If I run both the applications to display on my
> Linux box, then they both work correctly, so it isn't AIX that is
> failing by itself or with a Linux X server, but an AIX/Cygwin
> interaction seems to be going awry.
>     So, what are some of the obvious differences between AIX and Linux here:
> 
> 1) Different Java binaries (they are the same Java version, so I think this is unlikely to be the problem)
> 2) Different graphics libraries.  Both use SWT, but on Linux SWT uses GTK.  On AIX, SWT uses Motif.
> 
> Possibly related bugs I found:
> 
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=36806
> 
>     At this point, I'm at a loss as to how to further debug the problem.  I'd appreciate any thoughts.  Thanks!
> 
> Steps to reproduce:
> 
> 0) Log into an AIX box from a Windows machine with SSH (X11 tunneling on) and Cygwin X.

Thanks for the clear repro steps.  Unfortunately, I don't have access to an 
AIX box so I'm afraid I can't put use them myself.

I'm not sure what the best approach to debugging this is.  It might be 
informative to use wireshark to look at the X protocol exchanges between the 
client and server in the AIX/Cygwin and AIX/Linux cases and see if there are 
differences which explain the difference in behaviour?



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