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From "Serge Tsv (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3454) 'java.lang.NullPointerException' is thrown when starting a master db before a slave one
Date Sat, 23 Feb 2008 11:17:19 GMT
'java.lang.NullPointerException' is thrown when starting a master db before a slave one

                 Key: DERBY-3454
                 URL: https://issues.apache.org/jira/browse/DERBY-3454
             Project: Derby
          Issue Type: Bug
          Components: Replication
    Affects Versions:
            Reporter: Serge Tsv

The 'java.lang.NullPointerException' exception is thrown when a database is started in a master
mode and is trying to establish a connection to an slave database socket, which is not available.

The exception is by the MasterController#startMaster(). First, it tries to setup connection
with a slave database using a transmitter:
       -> transmitter = new ReplicationMessageTransmit(); 
              -> new InetSocketAddress() -> createSocket() -> connect()

The connect() method throws a ConnectException, and so fails to create a socketConn instance.
The exception is then wrapped several times an propagated back to the MasterController#startMaster()
method. It's caught there and then a MasterController#teardownNetwork() method is called,
which tries to send a STOP message using the aforementioned transmitter, which hasn't been
able to init a connection. 

A transmitter simply tries to call socketConn.writeMessage(message), which throws NPE because
socketConn is null.


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