A DESCRIPTION OF THE REQUEST :
We are facing performance issue because of blocking code in java.security.Permissions.

The code that is being accessed in java.security.Permissions.implies :
public boolean implies(Permission permission) {
        // No sync; staleness -> skip optimization, which is OK
        if (allPermission != null) {
            return true; // AllPermission has already been added
        } else {
            synchronized (this) {
                PermissionCollection pc = getPermissionCollection(permission,
                    false);
                if (pc != null) {
                    return pc.implies(permission);
                } else {
                    // none found
                    return false;
                }
            }
        }
    }

You will notice that the call here is within synchronized block which requires lock on instance monitor to proceed.

In my view, we should use a read write lock here such that multiple read operations can run in parallel without blocking each other as is the case now.

JUSTIFICATION :
Since Java is used in such large number of production deployments, it is mostly assumed that it is optimized for performance. As far as I know there is continuous endeavour to improve code quality and performance of JDK. I will appreciate if this issue is accepted and concerns specified here are addressed.