解决linux下java读取串口之权限问题 No permission to create lock file. 分类： LINUX 20100713 20:51 2006人阅读 评论(0) 收藏

在终端或IDE中运行java读取串口程序时，总是报告如下信息：

[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 check_group_uucp(): error testing lock file creation Error details:Permission deniedcheck_lock_status: No permission to create lock file. please see: How can I use Lock Files with rxtx? in INSTALL

根据此提示，找到下载的RXTX包中的INSTALL文件后，用UE打开，发现如下信息【部分】：

Linux (only x86, x86_64, ia64 here but more in the ToyBox) RXTXcomm.jar goes in /jre/lib/ext (under java) librxtxSerial.so goes in /jre/lib/[machine type] (i386 for instance) Make sure the user is in group lock or uucp so lockfiles work. A person 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 and taj are in group lock. Also make sure jarvi and taj have read and write permissions on the port.

解决步骤为：

1：查找/etc下的groups文件，但是没有找到。只有group、group- 这2个文件，其中group文件就是我们要找的。

打开此文件，将如下2段修改：

uucp:x:14:uucp         修改为  uucp:x:14:uucp,lhwtouch

lock:x:54:                  修改为  lock:x:54:lhwtouch

修改这个文件后，必须重启系统，才能使之起效！

备注：

1、本人所用系统为中标普华linux2.6

2、修改group文件中的lhwtouch为系统的普通用户。

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