Why is java X application not working through ssh tunnel?

Solution Verified - Updated -

Issue

We wanted to use jconsole with OpenJDK and found that it did not work with putty (X display redirection in SSH tunnel)
There is no error message, the X server (Xming) tells that a client is connected, but you do not see a window.

Environment

Server:
- Red Hat Enterprise Linux 6.x
- Red Hat Enterprise Linux 5.x

Client:
- Putty 0.62.0.0
- Xming 6.9.0.31
- Microsoft Windows XP Professional Service Pack 3

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