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From Knut Wannheden <knut.wannhe...@gmail.com>
Subject Re: Configuration as List of String and nulls
Date Wed, 06 Jul 2005 17:26:36 GMT
Jean-Francois,

The error message you get is missleading so this is certainly
something we have to fix in HiveMind.

I think we should actually change the <invoke-parent> rule to allow
null values. I take it that's what your preferred solution would be as
well, no?

--knut

On 7/6/05, Jean-Francois Poilpret <jfpoilpret@hcm.vnn.vn> wrote:
> Hello,
> 
> For some configurations, I need to have something that looks like the
> following (NB: the real case is more complex, but the next example exhibits
> the problem I meet):
> 
> <configuration-point id="Menus">
>         <schema>
>                 <element name="item">
>                         <attribute name="id"/>
>                         <rules>
>                                 <push-attribute attribute="id"/>
>                                 <invoke-parent method="addElement"/>
>                         </rules>
>                 </element>
>         </schema>
> </configuration-point>
> 
> Please note that:
> - the "id" attribute defines no translator (so passed directly as String)
> - the "id attribute is not required
> 
> Then in my configuration I put:
> 
> <contribution configuration-id="Menus">
>         <item id="item-1"/>
>         <item/>
> </contribution>
> 
> From the schema that I declared the second "item" tag is valid (no id
> attribute). However, when I get the configuration and I want to use it, I
> have got an exception:
> 
> org.apache.hivemind.ApplicationRuntimeException:
>         Unable to construct configuration test.Menus:
>         Error invoking method addElement on
> org.apache.hivemind.impl.SchemaProcessorImpl@172e449
>         (at
> jar:file:/C:/dev/hivetranse-hm11/build/bugs.test.jar!/META-INF/hivemodule.xm
> l, line 10):
>         java.lang.NullPointerException
> [jar:file:/C:/dev/hivetranse-hm11/build/bugs.test.jar!/META-INF/hivemodule.x
> ml, line 10]
> at
> org.apache.hivemind.impl.ConfigurationPointImpl.processContributionElements(
> ConfigurationPointImpl.java:273)
> at
> org.apache.hivemind.impl.ConfigurationPointImpl.constructElements(Configurat
> ionPointImpl.java:189)
> at
> org.apache.hivemind.impl.ElementsInnerProxyList.inner(ElementsInnerProxyList
> .java:46)
> at
> org.apache.hivemind.impl.ElementsInnerProxyList.size(ElementsInnerProxyList.
> java:62)
> at
> org.apache.hivemind.impl.ElementsProxyList.size(ElementsProxyList.java:60)
> at
> test.MenuContributionTest.testMenuContribution(MenuContributionTest.java:25)
> 
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
> )
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
> .java:25)
> 
> Caused by: org.apache.hivemind.ApplicationRuntimeException:
>         Error invoking method addElement on
> org.apache.hivemind.impl.SchemaProcessorImpl@172e449
>         (at
> jar:file:/C:/dev/hivetranse-hm11/build/bugs.test.jar!/META-INF/hivemodule.xm
> l, line 10):
>         java.lang.NullPointerException
> [jar:file:/C:/dev/hivetranse-hm11/build/bugs.test.jar!/META-INF/hivemodule.x
> ml, line 10]
> at
> org.apache.hivemind.schema.rules.InvokeParentRule.begin(InvokeParentRule.jav
> a:63)
> at org.apache.hivemind.impl.SchemaElement.fireBegin(SchemaElement.java:228)
> at
> org.apache.hivemind.impl.SchemaProcessorImpl.processElement(SchemaProcessorI
> mpl.java:255)
> at
> org.apache.hivemind.impl.SchemaProcessorImpl.processRootElement(SchemaProces
> sorImpl.java:235)
> at
> org.apache.hivemind.impl.SchemaProcessorImpl.process(SchemaProcessorImpl.jav
> a:223)
> at
> org.apache.hivemind.impl.ConfigurationPointImpl.processContributionElements(
> ConfigurationPointImpl.java:268)
> ... 20 more
> 
> Caused by: java.lang.NullPointerException
> at
> org.apache.hivemind.schema.rules.InvokeParentRule.begin(InvokeParentRule.jav
> a:57)
> ... 25 more
> 
> Actually, I would have expected to get a List of 2 Strings, the first being
> "item-1", the second being null.
> 
> Is my assumption founded (ie, can I consider this to be a HiveMind problem)
> or should I consider a different way to handle this situation (Note that I
> have another way already but I am not very pleased with it: I had to write a
> class wrapping a String to make this work).
> 
> Thanks for any answer/comment.
> Cheers
> 
>         Jean-Francois
> 
> 
> 
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