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From "Rob Walker (JIRA)" <j...@apache.org>
Subject [jira] Created: (CONFIGURATION-365) Bean handling not allowing an XPathExpressionEngine
Date Tue, 17 Feb 2009 11:04:59 GMT
Bean handling not allowing an XPathExpressionEngine
---------------------------------------------------

                 Key: CONFIGURATION-365
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-365
             Project: Commons Configuration
          Issue Type: Bug
         Environment: OSGi / Felix
            Reporter: Rob Walker


Trying to set an XPathExpressionEngine in the config file:

===
  <xml  
    config-name="config.product.xml" 
    fileName="${sys:bundle.root}/etc/${sys:launch.target}.properties.xml" 
    >
        <expressionEngine config-class="org.apache.commons.configuration.tree.xpath.XPathExpressionEngine"/>
  </xml>
===

And it throws an exception:

====
Caused by: org.apache.commons.configuration.ConfigurationException: org.apache.commons.configuration.ConfigurationRuntimeException:
java.lang.IllegalArgumentException: Cannot invoke org.apache.commons.configuration.HierarchicalConfiguration.setExpressionEngine
on
bean class 'class org.apache.commons.configuration.XMLConfiguration' - argument type mismatch
- had objects of type "org.apache.comm
ons.configuration.tree.xpath.XPathExpressionEngine" but expected signature "org.apache.commons.configuration.tree.ExpressionEngine"
        at org.apache.commons.configuration.DefaultConfigurationBuilder.createConfigurationAt(DefaultConfigurationBuilder.java:752)
        at org.apache.commons.configuration.DefaultConfigurationBuilder.initCombinedConfiguration(DefaultConfigurationBuilder.java:6
28)
        at org.apache.commons.configuration.DefaultConfigurationBuilder.getConfiguration(DefaultConfigurationBuilder.java:560)
        at com.ascert.vt.modules.propsmgr.PropsMgrMainOSGI.<init>(PropsMgrMainOSGI.java:102)
        ... 13 more
Caused by: org.apache.commons.configuration.ConfigurationRuntimeException: java.lang.IllegalArgumentException:
Cannot invoke org.apa
che.commons.configuration.HierarchicalConfiguration.setExpressionEngine on bean class 'class
org.apache.commons.configuration.XMLCon
figuration' - argument type mismatch - had objects of type "org.apache.commons.configuration.tree.xpath.XPathExpressionEngine"
but e
xpected signature "org.apache.commons.configuration.tree.ExpressionEngine"
        at org.apache.commons.configuration.beanutils.BeanHelper.createBean(BeanHelper.java:252)
        at org.apache.commons.configuration.beanutils.BeanHelper.createBean(BeanHelper.java:269)
        at org.apache.commons.configuration.beanutils.BeanHelper.createBean(BeanHelper.java:283)
        at org.apache.commons.configuration.DefaultConfigurationBuilder.createConfigurationAt(DefaultConfigurationBuilder.java:747)
        ... 16 more
Caused by: java.lang.IllegalArgumentException: Cannot invoke org.apache.commons.configuration.HierarchicalConfiguration.setExpressio
nEngine on bean class 'class org.apache.commons.configuration.XMLConfiguration' - argument
type mismatch - had objects of type "org.
apache.commons.configuration.tree.xpath.XPathExpressionEngine" but expected signature "org.apache.commons.configuration.tree.Express
ionEngine"
===

Since XPathExpressionEngine implements ExpressionEngine, this looks like a reflection bug
to me i.e. not finding a method with a signature for implemented interfaces as opposed to
just subclasses.


Not sure if this is OSGi / Felix classloading related, but don't think so

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