I was wondering whether anyone can advice me on how to correctly
configure the datasource component within merlin. This is what I have
tried but I get an exception when I execute the block.
1. In the block.xml I use the include directive
<container name="pep">
:
:
<include name="jdbc-manager"
id="cornerstone-datasources:cornerstone-datasources-impl" version="1.0"
/>
</container>
2. In the config.xml I have the following
<targets>
<target path="/pep/jdbc-manager/manager">
<configuration>
<data-sources>
<data-source name="maindb"
class="org.apache.avalon.excalibur.datasource.JdbcDataSource">
<pool-controller min="5" max="10" />
<driver>org.gjt.mm.mysql.Driver</driver>
<dburl>jdbc:mysql:/localhost/test</dburl>
<user>mysql</user>
<password>mysql</password>
<auto-commit>true</auto-commit>
</data-source>
</data-sources>
</configuration>
</target>
:
:
</targets>
3. In one of my other services, I try to use the datasource like this
DataSourceComponent ds =
(DataSourceComponent)_dsSelector.select("maindb");
But when this service executes I get the following error
java.lang.NullPointerException
at
org.apache.avalon.activation.appliance.impl.DefaultBlock$BlockInvocation
Handler.invoke(DefaultBlock.java:996)
at $Proxy3.select(Unknown Source)
at
com.choreoworks.pep.loader.PEPLoader.testDataSource(PEPLoader.java:359)
at
com.choreoworks.pep.loader.PEPLoader.start(PEPLoader.java:184)
at
org.apache.avalon.activation.appliance.impl.DefaultAppliance.applyStart(
DefaultAppliance.java:998)
at
org.apache.avalon.activation.appliance.impl.DefaultAppliance.access$1400
(DefaultAppliance.java:112)
at
org.apache.avalon.activation.appliance.impl.DefaultAppliance$StandardFac
tory.newInstance(DefaultAppliance.java:1294)
at
org.apache.avalon.activation.lifestyle.impl.SingletonLifestyleHandler.re
freshReference(SingletonLifestyleHandler.java:138
)
at
org.apache.avalon.activation.lifestyle.impl.SingletonLifestyleHandler.re
solve(SingletonLifestyleHandler.java:88)
at
org.apache.avalon.activation.appliance.impl.DefaultAppliance.resolve(Def
aultAppliance.java:566)
at
org.apache.avalon.activation.appliance.impl.DefaultAppliance.deploy(Defa
ultAppliance.java:508)
at
org.apache.avalon.activation.appliance.impl.DefaultBlock.deploy(DefaultB
lock.java:623)
at
org.apache.avalon.activation.appliance.impl.BlockThread.run(BlockThread.
java:111)
Can anyone see any problems with my usage?
Has anyone used excalibur-datasource/cornerstone-datasources within
merlin?
cheers
</jima>
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