【转】解决linux下java读取串口之权限问题 No permission to creat
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出现这个问题主要是非root权限用户访问串口时出现。
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
ermission 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
短信设备二次开发
2022-04-09
0
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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
ermission 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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