My Java Application returns following Exception when saving a new file in /opt/wso2 on a CentOS 6.4:

Caused by java.io.FileNotFoundException: ... (No space left on device)

Caused by: java.io.FileNotFoundException: /opt/wso2/FrameworkFiles/trk_2014062500042488825_TRCK_PatfallHospis_pFromHospis_66601fb3-a03c-4149-93c3-6892e0a10fea.txt (No space left on device)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
at java.io.FileOutputStream.<init>(FileOutputStream.java:99)
at com.avintis.esb.framework.adapter.wso2.FrameworkAdapterWSO2.sendMessages(FrameworkAdapterWSO2.java:634)
... 23 more

But when I run df -a I can see that the partition still has plenty of space available:

[root@stzsi466 wso2]# df -a
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_stzsi466-lv_root
                      12054824   2116092   9326380  19% /
proc                         0         0         0   -  /proc
sysfs                        0         0         0   -  /sys
devpts                       0         0         0   -  /dev/pts
tmpfs                  4030764         0   4030764   0% /dev/shm
/dev/sda1               495844     53858    416386  12% /boot
/dev/sdb1             51605436   1424288  47559744   3% /opt/wso2
none                         0         0         0   -  /proc/sys/fs/binfmt_misc

[root@stzsi466 ~]# df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/mapper/vg_stzsi466-lv_root
                      765536   45181  720355    6% /
tmpfs                1007691       1 1007690    1% /dev/shm
/dev/sda1             128016      44  127972    1% /boot
/dev/sdb1            3276800    6137 3270663    1% /opt/wso2

What is the problem here? Is it caused by the Java on CentOS 6.4? I have another server running Redhat REHL 6.4 and all works fine - same Java etc.

Does anyone know of this problem?