ExcaliburComponentManager.configure() throws NUllPointerException

[Jan Stary]

Hi list,

when going through the examples in 'Developing with Avalon'
I got stuck with $SUBJ. The following jsp page ...

<jsp:useBean id="container" scope="application"
class="org.apache.bizserver.docs.ContainerComponent"/>

initializing container: <% container.initialize();%> done

... gives the following result:

java.lang.NullPointerException
at 
org.apache.avalon.excalibur.component.ExcaliburComponentManager.configure(ExcaliburComponentManager.java:378)
at org.apache.bizserver.docs.ContainerComponent.initialize(ContainerComponent.java:23)

The call actually does

public void initialize() throws Exception {
        DefaultConfigurationBuilder builder = new
        DefaultConfigurationBuilder();
        Configuration sysConfig = builder.buildFromFile(
                "/home/hans/casopis/system.xml");

        this.manager.contextualize(new DefaultContext());
        this.manager.configure(sysConfig);
        this.manager.initialize();
}

The evil happens in the configure() call - when commented out,
it works, except the components are not configured, of course :-)

Could this be due to errors in system.xml? It's copied directly
from DwAA:

<my-system>
  <component
    role="org.apache.avalon.excalibur.datasource.DataSourceComponentSelector"
    class="org.apache.avalon.excalibur.component.ExcaliburComponentSelector">
     <component-instance name="documents"
       class="org.apache.avalon.excalibur.datasource.JdbcDataSource">
         <pool-controller min="5" max="10"/>
         <auto-commit>false</auto-commit>
         <driver>org.mysql.MySqlDriver</driver>
         <dburl>jdbc:mysql:localhost/mydb</dburl>
         <user>test</user>
         <password>test</password>
      </component-instance>
      <component-instance name="security"
        class="org.apache.avalon.excalibur.datasource.JdbcDataSource">
         <pool-controller min="5" max="10"/>
         <auto-commit>false</auto-commit>
         <driver>org.mysql.MySqlDriver</driver>
         <dburl>jdbc:mysql:localhost/myotherdb</dburl>
         <user>test</user>
         <password>test</password>
      </component-instance>
  </component>
  <component
    role="org.apache.bizserver.docs.DocumentRepository"
    class="org.apache.bizserver.docs.DatabaseDocumentRepository">
      <dbpool>documents</dbpool>
  </component>
  <component
    role="org.apache.bizserver.docs.GuardianComponent"
    class="org.apache.bizserver.docs.DocumentGuardianComponent">
      <dbpool>security</dbpool>
      <policy file="/home/system/document.policy"/>
  </component>
</my-system>

Or is it because something else? I don't expect Excalibur actually
tests the db connection when parsing the file, so the meaningless
'myotherdb' etc should matter.

Thanks a lot.

Jan


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