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https://issues.apache.org/jira/browse/JXPATH-80?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490162
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Nico Max commented on JXPATH-80:
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>From my above saying, that "java.lang.Object" is not a basic Xpath type, is 
>slightly wrong, as the property value itself might be. 

Anyway, as for the testcase, the property value itself is NULL; thus cannot be 
treated as for something else as an empty node list.

> boolean conversion of javabean getter values returning NULL fails
> -----------------------------------------------------------------
>
>                 Key: JXPATH-80
>                 URL: https://issues.apache.org/jira/browse/JXPATH-80
>             Project: Commons JXPath
>          Issue Type: Bug
>    Affects Versions: 1.2 Final
>         Environment: java.runtime.name=Java(TM) SE Runtime Environment
> java.runtime.version=1.6.0-b105
> java.specification.name=Java Platform API Specification
> java.specification.vendor=Sun Microsystems Inc.
> java.vm.info=mixed mode
> java.vm.name=Java HotSpot(TM) Client VM
>            Reporter: Nico Max
>            Priority: Minor
>         Attachments: patch.patch, patch.patch, test.java
>
>
> According to the JXPath User Guide a Javabean Getter returning NULL, 
> regadless of the type, will be converted bo Boolean FALSE. But trying to 
> build a boolean expression from this fails as the attached testcase shows.
> It seems that the type the bean getter returns matters, as a NULL String for 
> example works as expected.

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