The test java/nio/channels/FileChannel/BlockDeviceSize.java attempts to access block devices such as /dev/sda1 which typically are readable only by the owner and group members. For example:

$ ls -l /dev/sda[12]
brw-rw---- 1 root disk 8, 1 Feb 25 15:40 /dev/sda1
brw-rw---- 1 root disk 8, 2 Feb 25 15:40 /dev/sda2

It would be better if a test could be devised which did not require extra permission.