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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