Solve Linux Java read serial port permissions problem No permission to create lock File.__linux

When running Java read serial programs in the terminal or IDE, the following information is always reported:

[Lhwtouch@localhost root]$ java Main experimental:jni_onload called. Stable Library ========================================= Native lib Version = Rxtx-2.1-7 Java lib Version = Rxtx-2.1-7 che CK_GROUP_UUCP (): Error testing lock file creation error details:permission Deniedcheck_lock_status:no Permission to creat e lock file. Please see:how can I use the Lock Files with RXTX? In INSTALL

According to this hint, after finding the install file in the downloaded RXTX package, open with UE and find the following information "section":

Linux (only x86, x86_64, ia64-but more in the Toybox) Rxtxcomm.jar goes (In/jre/lib/ext java) under Goes In/jre/lib/[machine type] (i386 for instance) Make sure the user are in group lock or UUCP so lockfiles work. A is added to group lock or UUCP by editing/etc/groups. Distributions have various tools but this Works:lock:x:54:becomes:lock:x:53:jarvi,taj now Jarvi with Taj in group Lo Ck. Also make sure Jarvi and Taj have read and write permissions on the port.

The resolution steps are:

1: Find the groups file under/etc, but not found. Only group, group-these 2 files, where the group file is what we are looking for.

Open this file to modify the following 2 paragraphs:

UUCP:X:14:UUCP modified to Uucp:x:14:uucp,lhwtouch

LOCK:X:54: Modified to Lock:x:54:lhwtouch

After you modify this file, you must reboot the system to make it work.

Note:

1, I used the system for the successful linux2.6 Pu Hua

2, modify the Lhwtouch in the group file as the ordinary users of the system.