Lesson: Quick Tour of Controlling Applications
The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
Set up the Policy File to Grant the Required Permissions
This step uses the Policy Tool utility to open the policy file named examplepolicy created in the
Creating a Policy File lesson. You will add a new policy entry granting permission for code from the directory where GetProps.class is stored to read the "user.home" and the "java.home" property values, as shown in the following figure.
The steps are as follows.
Note for UNIX Users: The instructions illustrate creating the policy file for a Windows system. The steps are exactly the same if you are working on a UNIX system, with the following differences.
- You retrieve the
examplepolicyfile from thetestdirectory in your home directory. - For the CodeBase URL in the step for granting the required permissions, you can substitute
file:${user.home}/test/forfile:/C:/Test/. Alternatively you could directly specify your home directory rather than referring to the"user.home"property, as infile:/home/jones/test/.