With this example we are going to demonstrate how to get all permissions granted to a loaded Class in Java. In short, to get the permissions granted to a Class that is loaded you should:
- Get the ProtectionDomain of the Class. Create a new ProtectionDomain, using the
getProtectionDomain()API method of the Class. - Create a PermissionCollection, by getting the permissions for the specific ProtectionDomain, using the
getPermissions(ProtectionDomain domain)API method of the installed Policy Object. - Create an Enumeration of all the Permission objects in the PermissionCollection, using the
elements()API method of the PermissionCollection. - For each permission in the enumeration create a new Permission Object, using the
nextElement()API method of the Enumeration.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.Policy;
import java.security.ProtectionDomain;
import java.util.Enumeration;
public class GetGrantedPermissions {
public static void main(String[] args) {
// Get the protection domain for the class
ProtectionDomain protectionDomain = GetGrantedPermissions.class.getProtectionDomain();
// Get all the permissions from the Policy object
PermissionCollection permissionCollection = Policy.getPolicy().getPermissions(protectionDomain);
Enumeration permissions = permissionCollection.elements();
while (permissions.hasMoreElements()) {
Permission permission = (Permission)permissions.nextElement();
System.out.println(permission.getName());
}
}
}
Example Output:
stopThread
exitVM
/home/kioub/workspace/test/bin/-
line.separator
java.vm.version
java.vm.specification.version
java.vm.specification.vendor
java.vendor.url
java.vm.name
os.name
java.vm.vendor
path.separator
java.specification.name
os.version
os.arch
java.class.version
java.version
file.separator
java.vendor
java.vm.specification.name
java.specification.version
java.specification.vendor
localhost:1024-
<all permissions>
This was an example of how to get all permissions granted to a loaded Class in Java.
