Performing weaving (static or dynamic) results in the following error:
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.7.1.v20171221-bd47e8f): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [MyUnit] failed.
Internal Exception: java.lang.NullPointerException
at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:231)
... 20 more
Caused by: java.lang.NullPointerException
at org.eclipse.persistence.sessions.Project.hasSQLResultSetMapping(Project.java:1040)
at org.eclipse.persistence.internal.jpa.metadata.queries.NamedNativeQueryMetadata.hasResultSetMapping(NamedNativeQueryMetadata.java:141)
at org.eclipse.persistence.internal.jpa.metadata.queries.NamedNativeQueryMetadata.process(NamedNativeQueryMetadata.java:172)
at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processQueries(MetadataProject.java:1713)
at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.addNamedQueries(MetadataProcessor.java:153)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:2024)
I didn't get this error with EclipseLink 2.6.5 and if I turn Weaving off everything works fine. Is there a way to work around it? What triggers the error?
The NPE is a bug, as it isn't performing a null check and throwing a more specific error: This error could only occur if you've specified a named native (SQL) query on your entities that references a SqlResultSetMapping, but you haven't defined any result sets mappings. See https://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Querying/Native#SQL_Result_Set_Mapping for documentation and an example.