one for the reflection experts

[jwenting]

I try to use getClass().getPackage().getName() to get the package name of an object to insert into a log message.
Sometimes it works, at other times it throws a NullPointerException.

Does anyone have any insight into the conditions under which getPackage() returns null ('cause that's what's happening)?
The classes in question are inside a package (as all classes should be).

In this test the call returns the package name as expected.

package wtg.test;

import java.util.*;

public class MapTest {
    public MapTest() {
        super();
    }

    public static void main(String[] args) {
        System.out.println(new HashMapTest().getClass().getPackage().getName());
    }
}

This code does not

package suncertify.db;

import java.rmi.RemoteException;
import java.util.*;
import java.util.logging.Logger;

public class LockManager {

// lots of other methods and declarations

public long lock(int recordId) throws RemoteException {
        Logger.getLogger(getClass().getPackage().getName()).entering(this.
            getClass().getName(), "lock");
        synchronized (locks) {
            while (locks.containsKey(recordId)) {
                try {
                    locks.wait();
                } catch (InterruptedException ex) {
                    Logger.getLogger(getClass().getPackage().getName()).
                        info(
                            "InterruptedException while waiting for lock to be released");
                }
            }
            long cookie = System.nanoTime();
            locks.put(recordId, cookie);
            timestamps.put(recordId, new Date());
            Logger.getLogger(getClass().getPackage().getName()).exiting(this.
                getClass().getName(), "lock");
            return cookie;
        }
    }

// more methods

}