问题描述
我正在尝试构建一个可以打开串行端口并与之通信的小程序.我使用 rxtxcomm.jar 进行串行通信.我构建了一个可以在 eclipese 环境中完美运行的小程序.我构建了 Jar 文件并对其进行了签名,但是在浏览器中运行时,控制台会显示以下内容:
I am trying to build an applet that can open a serial port and communicate with the same. I have used rxtxcomm.jar for the serial communications. I have an applet built that works in the eclipese environment perfectly. I built the Jar file and signed the same, but when run in the browser the console shows the foll:
java.lang.ExceptionInInitializerError thrown while loading gnu.io.RXTXCommDriver Exception in thread "thread applet-zhas_xbeeComm.xtalk-1" java.lang.ExceptionInInitializerError at zhas_xbeeComm.Xconnect$1.run(Xconnect.java:46) at java.security.AccessController.doPrivileged(Native Method) at zhas_xbeeComm.Xconnect.connect(Xconnect.java:40) at zhas_xbeeComm.xtalk.init(xtalk.java:22) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission loadLibrary.rxtxSerial) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkLink(Unknown Source) at java.lang.Runtime.loadLibrary0(Unknown Source) at java.lang.System.loadLibrary(Unknown Source) at gnu.io.CommPortIdentifier.<clinit>(CommPortIdentifier.java:123) ... 6 more
我什至在 connect 和 open 函数周围使用了 doPrivileged 方法,但它不起作用!请帮忙!!这是小程序的代码片段:{/** 打开一个端口并开始读写的函数 */
I have even used doPrivileged method around the connect and open functions but it aint working! Please help!! Here is a snippet of the code of the applet: { /** Function to open a port and begin reading and writing */
public void connect ( final String portName ) throws Exception { AccessController.doPrivileged(new PrivilegedAction() { public Object run() { // privileged code goes here, for example: // 1. added try catch for no such port exception; try { portIdentifier = CommPortIdentifier.getPortIdentifier(portName); //line 46 } catch (NoSuchPortException e) { // TODO Auto-generated catch block e.printStackTrace(); }
}
推荐答案
刚遇到同样的问题.请确保对 RXTX 库的第一次调用是在 doPrivileged 块中.如果它将尝试在特权块之前加载库 - 它将失败并出现此错误.
Just had the same problem. Please make sure that the first call to RXTX library is in doPrivileged block. If it will try to load library before privileged block - it will fail with this error.
一些附加信息:http://hacky.typepad.com/blog/2009/05/using-rxtxcomm-in-applets.html