This problem appears to be AT-SPI (accessibility) related. stracing
netbeans 7.1 shows that the JVM is attempting to connect to a separate
dbus session bus. However, the dbus daemon associated with that bus
isn't running.

If you run "gnome-control-center", select "Universal Access", and enable
a setting (for example the screen reader), you'll then find a number of
new spi processes running including:

at-spi2-registryd ?
at-spi-bus-launcher
dbus-daemon (a 2nd instance specifically for at-spi seemingly).

If you now attempt to start netbeans, you'll find the JVM crashes with a
core dump. Killing those processes returns us to the initial "Couldn't
connect to accessibility bus:" warning. So, there seems to be a problem
with openjdk's use of at-spi.

See bug 68714.

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https://bugs.launchpad.net/bugs/935296

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