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From "Deepa Remesh (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-375) Specification of incomplete server properties on command line causes NPE with NetworkServerControl when starting the server.
Date Thu, 13 Oct 2005 00:51:05 GMT
    [ http://issues.apache.org/jira/browse/DERBY-375?page=comments#action_12331941 ] 

Deepa Remesh commented on DERBY-375:

The default values for network server properties mentioned in Derby Server and Administration
Guide are:

derby.drda.host - If no host name is specified, the Network Server listens on the loopback
address of the current machine (localhost).
derby.drda.keepAlive - true
derby.drda.logConnections - false
derby.drda.maxThreads - 1
derby.drda.minThreads - 1
derby.drda.portNumber - If no port number is specified, 1527 is the default.
derby.drda.startNetworkServer - false
derby.drda.timeSlice - 1
derby.drda.traceAll - false
derby.drda.traceDirectory - If the derby.system.home property has been set, it is the default.
Otherwise, the default is the current directory.
derby.drda.debug - false 

However, in the code, default value of minThreads, maxThreads and timeSlice is '0'. In my
patch too, I am using '0' as the default value for these. I also saw a test (maxThread.java)
which tests default value of maxThreads as '0'. I think the document needs to be updated.
Also, the property 'derby.drda.debug' is not listed in the admin guide. Is this an internal
property not exposed to users? 

> Specification of incomplete server properties on command line causes NPE with NetworkServerControl
when starting the server.
> ----------------------------------------------------------------------------------------------------------------------------
>          Key: DERBY-375
>          URL: http://issues.apache.org/jira/browse/DERBY-375
>      Project: Derby
>         Type: Bug
>   Components: Network Server
>     Versions:,
>  Environment: Running Derby Network Server and using command line API to start the server.
>     Reporter: A B
>     Assignee: Deepa Remesh
>      Fix For:

> When using the command line to start the Network Server, there a couple of cases where
if a property is specified on the command line but no value is given (ex. "-Dderby.drda.maxThreads"
instead of "-Dderby.drda.maxThreads=3"), a Null Pointer Exception will result, when the correct
behavior should be to use some kind of default.
> For example:
> > java -Dderby.drda.maxThreads org.apache.derby.drda.NetworkServerControl start -p
> java.lang.NullPointerException
>         at org.apache.derby.impl.drda.NetworkServerControlImpl.localizeMessage(NetworkServerControlImpl.java)
>         at org.apache.derby.impl.drda.NetworkServerControlImpl.consolePropertyMessageWork(NetworkServerControlImpl.java)
>         at org.apache.derby.impl.drda.NetworkServerControlImpl.consolePropertyMessage(NetworkServerControlImpl.java)
>         at org.apache.derby.impl.drda.NetworkServerControlImpl.getIntPropVal(NetworkServerControlImpl.java)
>         at org.apache.derby.impl.drda.NetworkServerControlImpl.getPropertyInfo(NetworkServerControlImpl.java)
>         at org.apache.derby.impl.drda.NetworkServerControlImpl.<init>(NetworkServerControlImpl.java)
>         at org.apache.derby.drda.NetworkServerControl.main(NetworkServerControl.java)
> Note that even though we see this NPE, it appears that the server still starts up, although
the startup may not be complete (subsequent attempts to connect  might lead to errors like
"Invalid reply from network server: Insufficient data.").
> For other properties, this will just result in the default value being used, which is
the correct behavior.  For example:
> > java -Dderby.drda.host org.apache.derby.drda.NetworkServerControl start -p 1528
> Server is ready to accept connections on port 1528.

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