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Trail: Security Features in Java SE
Lesson: Quick Tour of Controlling Applications
Quick Tour of Controlling Applications
Observe Application Freedom
See How to Restrict Applications
Set up the Policy File to Grant the Required Permissions
Open the Policy File
Grant the Required Permissions
Save the Policy File
See the Policy File Effects
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Observe Application Freedom

> A security manager is not automatically installed when an application is running. In the next step, you'll see how to apply the same security policy to an application found on the local file system as to downloaded unsigned applets. But first, let's demonstrate that a security manager is by default not installed for an application, and thus the application has full access to resources.

> Create a file named `GetProps.java` on your computer by either copying or downloading the `GetProps.java` source code.

> The examples in this lesson assume that you put `GetProps.java` in the `C:\Test` directory if you're using a Windows system or in the `~/test` directory on UNIX.

> As you can see if you examine the source file, this program tries to get (read) the property values, whose names are `"os.name"` , `"java.version"`, `"user.home"`, and `"java.home"`.

> Now compile and run `GetProps.java`. You should see output like the following:

> >     C:\TEST>java GetProps
> >         About to get os.name property value
> >           The name of your operating system is: Windows XP
> >         About to get java.version property value
> >           The version of the JVM you are running is: 1.6.0
> >         About to get user.home property value
> >           Your user home directory is: C:\WINDOWS
> >         About to get java.home property value
> >           Your JRE installation directory is: C:\JDK6.0.0\JRE

> This shows that the application was allowed to access all the property values, as shown in the following figure.

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