Previous | Next | Trail Map | Security in JDK 1.2 | Quick Tour of Controlling Applications

Grant the Required Permissions

To grant the GetProps application permission to read the "user.home" and "java.home" property values, you must create a policy entry granting this permission.

Select the Add Policy Entry button in the main "Policy Tool" window. This brings up the "Policy Entry" dialog box:

Type the following file URL into the CodeBase text box to indicate you are going to be granting a permission to code from the specified directory, which is the directory in which GetProps.class is stored: 

file:/C:/Test/
(Note, this is a URL and thus must always have slashes, not backslashes.)

Leave the SignedBy text box blank, since you aren't requiring the code to be signed.

To add permission to read the "user.home" property value, select the Add Permission button. This brings up the "Permissions" dialog box:

Do the following:
  1. Select Property Permission from the "Permission:" drop-down list. The complete permission type name (java.util.PropertyPermission) now appears in the text box to the right of the drop-down list.

  2. Type the following in the text box to the right of the list labeled "Target Name:" to specify the "user.home" property: 
    user.home
  3. Specify permission to read this property by selecting read from the "Actions:" drop-down list.
Now the "Permissions" dialog box looks like the following:

Select the OK button. The new permission appears in a line in the policy entry window:

To add permission to read the "java.home" property value, select the Add Permission button again. In the "Permissions" dialog box, do the following:

  1. Select Property Permission from the "Permission:" drop-down list.

  2. Type the following in the text box to the right of the list labeled "Target Name:" to specify the "java.home" property: 
    java.home
  3. Specify permission to read this property by selecting read from the "Actions:" drop-down list.
Now the "Permissions" dialog box looks like the following:

Select the OK button. The new permission and the previously-added permission appear in lines in the policy entry window:

You are now done specifying this policy entry, so select the Done button in the "Policy Entry" dialog. The "Policy Tool" window now includes a line representing the new policy entry, showing the CodeBase value:

Previous | Next | Trail Map | Security in JDK 1.2 | Quick Tour of Controlling Applications