udev rules error on BBB

Now i am able to open port using symlink name on my java app by using following line

       System.setProperty("gnu.io.rxtx.SerialPorts", "/dev/printer");

But according to rxtx lib source, it will omit other device if we user system property method, so that i can't use more than one device using it's symlink name,

is there any way to load more than one symlinked devices?

Reference

Trouble shooting - Rxtx

If you wish, you can set the system properties gnu.io.rxtx.SerialPorts and gnu.io.rxtx.ParallelPorts. If either of these is set, then no scanning will be carried out and only the specified ports will be available

Now i am able to open port using symlink name on my java app by using following line

       System.setProperty("gnu.io.rxtx.SerialPorts", "/dev/printer");

But according to rxtx lib source, it will omit other device if we user system property method, so that i can't use more than one device using it's symlink name,

is there any way to load more than one symlinked devices?

Reference

Trouble shooting - Rxtx

If you wish, you can set the system properties gnu.io.rxtx.SerialPorts and gnu.io.rxtx.ParallelPorts. If either of these is set, then no scanning will be carried out and only the specified ports will be available

Have a look at this it may help, it applies to  both RPi and BBB  http://angryelectron.com/rxtx-on-raspbian/

Thanks Brain, i solved it by adding symlink names with column separated as follows 

   System.setProperty("gnu.io.rxtx.SerialPorts", "/dev/Printer:/dev/Display");

but i think we can solve it as follows also by script

java -Dgnu.io.rxtx.SerialPorts=/dev/printer:/dev/dispaly

Great,  Yes and I have just found this too in the FAQ - Rxtx

You can specify the available ports by

 System.setProperty("gnu.io.rxtx.SerialPorts", portFileNames); 

where the file names of the ports are separated by File.pathSeparator.

Brain, now i am facing another issue that, when job get done by my java app, the device is get disconnected and then appeared with new portname e.g ttyUSB1/2 automatically in /dev directory, now  i send command to that device, job is not get done because port is changed my app assign this device with same symlink that correscopnds to another ttyUSB1/2 on startup, if i restart my app then works once then same issue comes, i don't know why this behavior on BBB, my job is to print token using small thermal printer, this thermal printer is interfaced with BBB through USB-Serial converter(Prolific-PL2303), Do you have any idea or clue about this issue?