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java.lang.NullPointerException: 	at org.hibernate.boot.model.source.internal.hbm.HbmMetadataSourceProcessorImpl.(HbmMetadataSourceProcessorImpl.java:53)	at org.hibernate.boot.model.source.internal.hbm.HbmMetadataSourceProcessorImpl.(HbmMetadataSourceProcessorImpl.java:40)	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.(MetadataBuildingProcess.java:142)	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:141)	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)	at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)	at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)	at org.hibernate.boot.MetadataSources.buildMetadata(MetadataSources.java:179)