How to deal with IO Exception: Not Enough Space

Question

I always get the error message like IO Exception: Not Enough Space, following is the information on my desk , is not suppose have this happy is that right ?
why ? and how to deal with ?? I use solars 10 with NetBean 6.9
# df -k
Filesystem kbytes used avail capacity Mounted on
rpool/ROOT/s10x_u8wos_08a
239468544 7338765 229954672 4% /
/devices 0 0 0 0% /devices
ctfs 0 0 0 0% /system/contract
proc 0 0 0 0% /proc
mnttab 0 0 0 0% /etc/mnttab
swap 610684 348 610336 1% /etc/svc/volatile
objfs 0 0 0 0% /system/object
sharefs 0 0 0 0% /etc/dfs/sharetab
/usr/lib/libc/libc_hwcap1.so.1
237293437 7338765 229954672 4% /lib/libc.so.1
fd 0 0 0 0% /dev/fd
swap 610484 148 610336 1% /tmp
swap 610360 24 610336 1% /var/run
rpool/export 239468544 23 229954672 1% /export
rpool/export/home 239468544 63960 229954672 1% /export/home
rpool 239468544 34 229954672 1% /rpool
#

Answer 1

Thank you for all the replies.
Just have time come to this forum:
think you are running out of swap space.Google surge this too,
at first I install solaria I give 512M out of totally 2G in memory,
then I run
# zfs create -V 512M rpool/additionalswap
# swap -a /dev/zvol/dsk/rpool/additionalswap
on meantime
swapfile dev swaplo blocks free
/dev/zvol/dsk/rpool/swap 181,3 8 1048568 1048568
# df -k
Filesystem kbytes used avail capacity Mounted on
rpool/ROOT/s10x_u8wos_08a
239468544 7280779 230012901 4% /
/devices 0 0 0 0% /devices
ctfs 0 0 0 0% /system/contract
proc 0 0 0 0% /proc
mnttab 0 0 0 0% /etc/mnttab
swap 392944 352 392592 1% /etc/svc/volatile
objfs 0 0 0 0% /system/object
sharefs 0 0 0 0% /etc/dfs/sharetab
/usr/lib/libc/libc_hwcap1.so.1
237293680 7280779 230012901 4% /lib/libc.so.1
fd 0 0 0 0% /dev/fd
swap                  392760     168  392592     1%    /tmp
swap                  392616      24  392592     1%    /var/run
rpool/export 239468544 23 230012901 1% /export
rpool/export/home 239468544 63989 230012901 1% /export/home
rpool 239468544 34 230012901 1% /rpool
/vol/dev/dsk/c7t0d0/unnamed_rmdisk:c
15618080 1985728 13632352 13% /rmdisk/unnamed_rmdisk
Edited by: Hjava on Nov 25, 2010 8:40 PM
Edited by: Hjava on Dec 9, 2010 2:09 AM
this link is useful
http://docs.sun.com/app/docs/doc/817-5093/gizet?l=zh_TW&a=view