Programmatically grant Permissions without using policy file

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How to programmatically grant AllPermissions to an RMI application without using policy file?

UPDATE:

After some researching, I have written this custom Policy Class and installed it via Policy.setPolicy(new MyPolicy()).

Now I get the following error:

invalid permission: (java.io.FilePermission \C:\eclipse\plugins\org.eclipse.osgi_3.7.0.v20110613.jar read

class MyPolicy extends Policy {

    @Override
    public PermissionCollection getPermissions(CodeSource codesource) {
        return (new AllPermission()).newPermissionCollection();
    }

}
policyfiles rmi permissions java
4 Answers

Short solution

Extend your updated solution to:

public class MyPolicy extends Policy
{
    @Override
    public PermissionCollection getPermissions(CodeSource codesource)
    {
        Permissions p = new Permissions();
        p.add(new AllPermission());
        return p;
    }
}

Consider, that Policy.getPermissions() must always return a mutable PermissionCollection

Returns: ...If this operation is supported, the returned set of permissions must be a new mutable instance and it must support heterogeneous Permission types...

This solution works already, since it adds an AllPermission object into every call of the Policy.getPermissions(ProtectionDomain), that refers to Policy.getPermissions(CodeSource).

Clean solution

But there is a cleaner solution, that doesn't track any unnecessary other Permissions, since AllPermissions allows pretty everything already.

public class MyPolicy extends Policy
{
    private static class AllPermissionsSingleton extends PermissionCollection
    {
        private static final long serialVersionUID = 1L;
        private static final Vector<Permission> ALL_PERMISSIONS_VECTOR = new Vector<Permission>(Arrays.asList(new AllPermission()));

        @Override
        public void add(Permission permission)
        {
        }

        @Override
        public boolean implies(Permission permission)
        {
            return true;
        }

        @Override
        public Enumeration<Permission> elements()
        {
            return ALL_PERMISSIONS_VECTOR.elements();
        }

        @Override
        public boolean isReadOnly()
        {
            return false;
        }
    }

    private static final AllPermissionsSingleton ALL_PERMISSIONS_SINGLETON = new AllPermissionsSingleton();

    @Override
    public PermissionCollection getPermissions(CodeSource codesource)
    {
        return ALL_PERMISSIONS_SINGLETON;
    }
}
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