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From "Deepa Remesh (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-1298) Tracing client data source gives NPE if all data source properties are not set
Date Sat, 06 May 2006 00:03:28 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1298?page=all ]

Deepa Remesh updated DERBY-1298:

    Attachment: ClientTracing.java

This repro uses the example for ClientDataSource tracing in http://db.apache.org/derby/papers/DerbyClientSpec.html#-N101A8

To run this repro, start network server, run the command "java ClientTracing". The directory
used for tracing "myTraceDir" has to be created before running the command. This gives the
following NPE:

        at java.util.Hashtable.put(Hashtable.java:393)
        at java.util.Properties.setProperty(Properties.java:102)
        at org.apache.derby.client.am.LogWriter.getProperties(LogWriter.java:1251)
        at org.apache.derby.client.am.LogWriter.traceConnectsEntry(LogWriter.java:1069)
        at org.apache.derby.client.am.LogWriter.traceConnectEntry(LogWriter.java:998)
        at org.apache.derby.client.am.Connection.initConnection(Connection.java:169)
        at org.apache.derby.client.am.Connection.<init>(Connection.java:160)
        at org.apache.derby.client.net.NetConnection.<init>(NetConnection.java:225)
        at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl.newNetConnection(ClientJDBCObject
        at org.apache.derby.jdbc.ClientDataSource.getConnection(ClientDataSource.java:185)
        at ClientTracing.sampleConnectUsingSimpleDataSource(ClientTracing.java:44)
        at ClientTracing.main(ClientTracing.java:10)

The reason for this is LogWriter.getProperties method tries to set all propeties of ClientDataSource
and this can give NPE if the value for any property is null. The solution seems to be just
to add a check before setting the property:
if(value != null)
                	properties.setProperty(propertyKey, value);

> Tracing client data source gives NPE if all data source properties are not set
> ------------------------------------------------------------------------------
>          Key: DERBY-1298
>          URL: http://issues.apache.org/jira/browse/DERBY-1298
>      Project: Derby
>         Type: Bug

>   Components: Network Client
>     Versions:,
>     Reporter: Deepa Remesh
>     Priority: Minor
>  Attachments: ClientTracing.java
> I found this when trying to capture client traces for another issue. If all the properties
are set to some value, tracing works without problems. I will upload a repro with more details.

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