How do I fix this error/warning that Netbeans gives me regarding no persistence unit?
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The project does not contain a persistence unit
#2
ObjectDB itself does not require a persistence unit, but NetBeans produces this warning because a persistence unit is required by JPA.
Although your application should work well with ObjectDB with no persistence unit, you may have to add a persistence unit definition in a persistence.xml file to your project, in order to remove this NetBeans warning.
ObjectDB Support
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#3
The warning doesn't seem to go away after placing persistence.xml into META-INF and cleaning and building?
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#4
Maybe the META-INF directory is not in the right place.
See the Java EE / JPA / Netbeans tutorial.
This page in the tutorial explains how to add a persistence unit.
ObjectDB Support
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