在启用Java安全管理器的情况下,获取系统属性"os.arch"时,权限被拒绝是因为Java安全管理器限制了对系统属性的访问。Java安全管理器是Java安全框架的一部分,用于控制Java应用程序的安全策略。它通过定义安全策略文件来限制应用程序的行为,包括对系统资源的访问。
要解决这个问题,可以通过修改安全策略文件来授予应用程序访问系统属性的权限。以下是一种可能的解决方法:
// default permissions granted to all domains
grant {
// Allows any thread to stop itself using the java.lang.Thread.stop()
// method that takes no argument.
// Note that this permission is granted by default only to remain
// backwards compatible.
// It is strongly recommended to modify this policy to deny such
// permission, or to require some form of authentication.
permission java.lang.RuntimePermission "stopThread";
// allows anyone to listen on dynamic ports
permission java.net.SocketPermission "localhost:0", "listen";
// "standard" properies that can be read by anyone
permission java.util.PropertyPermission "java.version", "read";
permission java.util.PropertyPermission "java.vendor", "read";
permission java.util.PropertyPermission "java.vendor.url", "read";
permission java.util.PropertyPermission "java.class.version", "read";
permission java.util.PropertyPermission "os.name", "read";
permission java.util.PropertyPermission "os.version", "read";
permission java.util.PropertyPermission "os.arch", "read";
permission java.util.PropertyPermission "file.separator", "read";
permission java.util.PropertyPermission "path.separator", "read";
permission java.util.PropertyPermission "line.separator", "read";
permission java.util.PropertyPermission "java.specification.version", "read";
permission java.util.PropertyPermission "java.specification.vendor", "read";
permission java.util.PropertyPermission "java.specification.name", "read";
permission java.util.PropertyPermission "java.vm.specification.version", "read";
permission java.util.PropertyPermission "java.vm.specification.vendor", "read";
permission java.util.PropertyPermission "java.vm.specification.name", "read";
permission java.util.PropertyPermission "java.vm.version", "read";
permission java.util.PropertyPermission "java.vm.vendor", "read";
permission java.util.PropertyPermission "java.vm.name", "read";
};
permission java.util.PropertyPermission "os.arch", "read";
permission java.util.PropertyPermission "os.arch", "read,write";
需要注意的是,修改安全策略文件可能会降低应用程序的安全性,因此在进行修改之前应该仔细评估风险。此外,如果应用程序在受信任的环境中运行,可以考虑禁用Java安全管理器以避免此类权限限制。
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