NullPointerException

[Chris Lamprecht]

I'm using the java client by Dustin Sallings, 2.0-pre4, and under a load of
about 20 requests per second, I'm getting this error every few minutes (and
it seems to kill the NIO thread, so I have to restart the program):

Exception in thread "Memcached IO over {MemcachedConnection to
localhost/127.0.0.1:11211}" java.lang.NullPointerException
        at net.spy.memcached.protocol.ProxyCallback.gotData(
ProxyCallback.java:41)
        at net.spy.memcached.protocol.ascii.GetOperationImpl.handleRead(
GetOperationImpl.java:95)
        at net.spy.memcached.protocol.ascii.OperationImpl.readFromBuffer(
OperationImpl.java:104)
        at net.spy.memcached.MemcachedConnection.handleReads(
MemcachedConnection.java:300)
        at net.spy.memcached.MemcachedConnection.handleIO(
MemcachedConnection.java:264)
        at net.spy.memcached.MemcachedConnection.handleIO(
MemcachedConnection.java:180)

Here's the code where the NPE is happening (just after the assert
statement):

public void gotData(String key, int flags, byte[] data) {
    Collection<GetOperation.Callback> cbs=callbacks.get(key);
    assert cbs != null : "No callbacks for key " + key;
    for(GetOperation.Callback c : cbs) {          <---- NPE here
        c.gotData(key, flags, data);
    }
}


Any ideas?  I haven't dug into the code yet to try and debug it.  Also
previously I tried the 1.4 client version and got an NPE in
OptimizeGet.javaor something like that.  Thanks

-Chris
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