:Elementry, my dear Watson.
:
:public class Hans implements Component, Composable, Disposable {
: ComponentManager manager;
: DataSourceComponent datasrc;
:
: public void compose(ComponentManager manager) {
: if (this.manager == null) {
: this.manager = manager;
: ComponentSelector selector = (ComponentSelector) this.manager.lookup(
: DataSourceComponent.ROLE + "Selector");
:
: datasrc = (DataSourceComponent) selector.select("documents");
: }
: }
:}
:
Firstly, thank you for guiding a stupido on the way through
the Avalon area.
1.
Now that my classes compile, thanks to Mr. Holmes, I'm in
the mood to use them ...
When writing a JSP page, how should I call the Hans.compose(),
I mean, what ComponentManager should I provide as an argument?
The class has it's own manager, so I tried suplying null,
which (surprise!) throws NullPointerException.
I suppose I have to call hans.compose() before I can use
the datasrc (and actually retrieve data from DB).
- cut ---
<%@ page language="java" session="true"
import="org.apache.bizserver.docs.*" %>
<jsp:useBean id="container" scope="page"
class="org.apache.bizserver.docs.ContainerComponent"/>
<jsp:useBean id="hans" scope="page"
class="org.apache.bizserver.docs.Hans"/>
<pre>
initializing container ... <% container.initialize(); %> done
user class composing components ... <%-- hans.compose(null); --%> done
disposing container ... <% container.dispose(); %> done
</pre>
- cut ---
2.
I use scope="page", because when using scope="session",
reloading the page says
javax.servlet.ServletException: Could not get class
and the log gently wheeps
ERROR 10111 [casopis ] (): Could not get class
org.apache.avalon.excalibur.component.ExcaliburComponentSelector for role
org.apache.avalon.excalibur.datasource.DataSourceComponentSelector on
configuration element datasources
org.apache.avalon.framework.component.ComponentException: Cannot add components
to an initialized ComponentManager
What's a natural way to solve this - conditionally include a
'container.initialize()'ing code on the top of every page?
Thanks for any help
Jan
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