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https://issues.apache.org/jira/browse/JDO-517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12519980
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Craig Russell commented on JDO-517:
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The specification for persistent properties of classes is:
• the property element declares the mapping between a virtual field of an
implemented
interface and the corresponding persistent field of the persistence-capable
class.
• the name attribute is required, and declares the name for the property. The
naming
conventions for JavaBeans property names is used: the property name is the same
as the
corresponding get method for the property with the get or is removed and the
resulting
name lower-cased.
• the mapped-by attribute specifies that the field is mapped to the same
database column(s)
as the named field in the other class.
• the field-name attribute is required; it associates a persistent field with
the named
property.
We had a further discussion via email about which should take precedence in
case both persistent properties and fields were specified. I didn't update the
spec with the results of the email discussion, so for now this test case should
be considered a work in progress. Sadly, we don't have test cases for
persistent properties of classes using xml so there's no guidance there. Would
it help to start with an xml test case?
> NPE on enhancement of classes with persistent properties
> --------------------------------------------------------
>
> Key: JDO-517
> URL: https://issues.apache.org/jira/browse/JDO-517
> Project: JDO
> Issue Type: Bug
> Components: tck2
> Affects Versions: JDO 2 maintenance release 1
> Reporter: Michelle Caisse
> Assignee: Andy Jefferson
>
> To reproduce, edit project.propeties, go to the end of the file, and edit out
> the comment and blank lines so that the classes in the companyAnnotatedPC
> package are included in the argument list to the enhancer.
> 11:39:16,031 (main) ERROR [JPOX.Enhancer] - An error was encountered reading
> the specified input files. Please consult the log for details. The following
> may help : Errors were encountered when loading the specified MetaData files
> and classes. See the nested exceptions for details
> Errors were encountered when loading the specified MetaData files and
> classes. See the nested exceptions for details
> org.jpox.exceptions.JPOXUserException: Errors were encountered when loading
> the specified MetaData files and classes. See the nested exceptions for
> details
> at
> org.jpox.metadata.MetaDataManager.initialise(MetaDataManager.java:299)
> at
> org.jpox.enhancer.JPOXEnhancer.getFileMetaDataForInput(JPOXEnhancer.java:724)
> at org.jpox.enhancer.JPOXEnhancer.main(JPOXEnhancer.java:533)
> Caused by: java.lang.NullPointerException
> at
> org.jpox.metadata.annotations.JDOAnnotationReader.processFieldAnnotations(JDOAnnotationReader.java:1594)
> at
> org.jpox.metadata.annotations.AbstractAnnotationReader.getMetaDataForClass(AbstractAnnotationReader.java:211)
> at
> org.jpox.metadata.annotations.AnnotationManagerImpl.getMetaDataForClass(AnnotationManagerImpl.java:133)
> at
> org.jpox.metadata.MetaDataManager.loadAnnotationsForClass(MetaDataManager.java:1729)
> at
> org.jpox.metadata.MetaDataManager.initialise(MetaDataManager.java:265)
> ... 2 more
> Nested Throwables StackTrace:
> java.lang.NullPointerException
> at
> org.jpox.metadata.annotations.JDOAnnotationReader.processFieldAnnotations(JDOAnnotationReader.java:1594)
> at
> org.jpox.metadata.annotations.AbstractAnnotationReader.getMetaDataForClass(AbstractAnnotationReader.java:211)
> at
> org.jpox.metadata.annotations.AnnotationManagerImpl.getMetaDataForClass(AnnotationManagerImpl.java:133)
> at
> org.jpox.metadata.MetaDataManager.loadAnnotationsForClass(MetaDataManager.java:1729)
> at
> org.jpox.metadata.MetaDataManager.initialise(MetaDataManager.java:265)
> at
> org.jpox.enhancer.JPOXEnhancer.getFileMetaDataForInput(JPOXEnhancer.java:724)
> at org.jpox.enhancer.JPOXEnhancer.main(JPOXEnhancer.java:533)
> java.lang.NullPointerException
> at
> org.jpox.metadata.annotations.JDOAnnotationReader.processFieldAnnotations(JDOAnnotationReader.java:1594)
> at
> org.jpox.metadata.annotations.AbstractAnnotationReader.getMetaDataForClass(AbstractAnnotationReader.java:211)
> at
> org.jpox.metadata.annotations.AnnotationManagerImpl.getMetaDataForClass(AnnotationManagerImpl.java:133)
> at
> org.jpox.metadata.MetaDataManager.loadAnnotationsForClass(MetaDataManager.java:1729)
> at
> org.jpox.metadata.MetaDataManager.initialise(MetaDataManager.java:265)
> at
> org.jpox.enhancer.JPOXEnhancer.getFileMetaDataForInput(JPOXEnhancer.java:724)
> at org.jpox.enhancer.JPOXEnhancer.main(JPOXEnhancer.java:533)
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