NPE in SSTableWriter when no ReplayPosition availible
-----------------------------------------------------

                 Key: CASSANDRA-2718
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2718
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.8.1
            Reporter: T Jake Luciani
            Assignee: T Jake Luciani
            Priority: Trivial
             Fix For: 0.8.1


The following NPE occurs when durable_writes is set to false

{noformat}
ERROR 09:20:30,378 Fatal exception in thread Thread[FlushWriter:11,5,main]
java.lang.RuntimeException: java.lang.NullPointerException
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:34)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
        at 
org.apache.cassandra.db.commitlog.ReplayPosition$ReplayPositionSerializer.serialize(ReplayPosition.java:127)
        at 
org.apache.cassandra.io.sstable.SSTableWriter.writeMetadata(SSTableWriter.java:209)
        at 
org.apache.cassandra.io.sstable.SSTableWriter.closeAndOpenReader(SSTableWriter.java:187)
        at 
org.apache.cassandra.io.sstable.SSTableWriter.closeAndOpenReader(SSTableWriter.java:173)
        at 
org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:253)
        at org.apache.cassandra.db.Memtable.access$400(Memtable.java:49)
        at org.apache.cassandra.db.Memtable$3.runMayThrow(Memtable.java:270)
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        ... 3 more
{noformat}

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