webstart应用程序日志记录权限被拒绝

问题描述

是否可以使用java.util.Logging并登录到Java Webstart应用程序中的文件?我有以下记录代码:

is it possible to use java.util.Logging and log to a file in a java webstart application?I have the following logging code:

 Handler fh = new FileHandler("myapp.log");
 Logger.getLogger(MyApp.class.getName()).addHandler(fh);

，但出现以下异常:

java.security.AccessControlException: access denied (java.util.logging.LoggingPermission control)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.util.logging.LogManager.checkAccess(Unknown Source)
    at java.util.logging.Handler.checkAccess(Unknown Source)
    at java.util.logging.FileHandler.(Unknown Source)
    at whoisapiclient.WhoisAPIClientApp.main(WhoisAPIClientApp.java:80)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.javaws.Launcher.executeApplication(Unknown Source)
    at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
    at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
    at com.sun.javaws.Launcher.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

推荐答案

访问控制异常是这样的:

The access control exception says this:

权限类的 javadoc 表示:

您所做的事情显然属于控制"权限.

What you are doing clearly falls under the "control" permission.

如果要创建/添加自己的日志处理程序，则需要对应用程序进行签名.

You will need to sign your application if it is to create/add its own log handlers.

顺便说一句，如果您确实设法解决了LoggingPermission("control")的问题，则在打开日志文件时会遇到另一个访问问题.

Incidentally, if you did manage to work around the LoggingPermission("control"), you would then run into another access issue in opening the log file.

这两个问题都可以通过对应用程序进行签名来解决.然后，您遇到了用户必须接受/信任您的签名密钥的问题.但这很公平！就Java安全沙箱所知，您正在执行的操作可能会损坏用户的计算机.

Both problems are solved by signing the application. You've then got the problem that the user has to accept / trust your signing key. But that is fair enough! As far as the Java security sandbox can tell, what you are doing could potentially damage the user's machine.

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