I don't know what causes this:

java.lang.NoClassDefFoundError: simpledb/buffer/BufferManagerTest
Caused by: java.lang.ClassNotFoundException: simpledb.buffer.BufferManagerTest
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Exception in thread "main"

it doesn't make sense, because we do have the main method in the BufferMgrTest?

-- Grady