System properties and security policy
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*/
public class GetProps {
public static void main(String[] args) {
/* Test reading properties w & w/out security manager */
String s;
try {
System.out.println("About to get os.name property value");
s = System.getProperty("os.name", "not specified");
System.out.println(" The name of your operating system is: " + s);
System.out.println("About to get java.version property value");
s = System.getProperty("java.version", "not specified");
System.out.println(" The version of the JVM you are running is: "
+ s);
System.out.println("About to get user.home property value");
s = System.getProperty("user.home", "not specified");
System.out.println(" Your user home directory is: " + s);
System.out.println("About to get java.home property value");
s = System.getProperty("java.home", "not specified");
System.out.println(" Your JRE installation directory is: " + s);
} catch (Exception e) {
System.err.println("Caught exception " + e.toString());
}
}
}
//File: java.policy
/*
// Standard extensions get all permissions by default
grant codeBase "file:${java.home}/lib/ext/" {
permission java.security.AllPermission;
};
// default permissions granted to all domains
grant {
// allows anyone to listen on un-privileged ports
permission java.net.SocketPermission "localhost:1024-", "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";
};
*/
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