Problem on start with starter-data-jpa and orm.xml on classpath

[artaban]

I'm using Spring boot 2.0.0.M4 and trying to run bundled application with orm.xml on classpath (resources/META-INF/). I'm getting following error:
java.lang.IllegalStateException: Duplicate XML entry for com.example.demo.model.Entity

The error is thrown on AnnotationMetadataSourceProcessorImpl.java:94) and is caused by the fact, that the orm.xml file has been found twice:

• Origin(name=BOOT-INF/classes/META-INF/orm.xml,type=INPUT_STREAM)
• Origin(name=jar:file:../build/libs/test-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/META-INF/orm.xml,type=INPUT_STREAM)

Attaching the sample gradle project: spring-orm-problem.zip

[wilkinsona]

Thanks for the sample. As far as I can tell, this is a bug in Hibernate. It should be looking for files named META-INF/orm.xml at the root of the classpath. Instead, it's finding files named META-INF/orm.xml anywhere on the classpath. When you run a Boot fat jar both the root of the jar (allowing the launcher to be loaded) and the BOOT-INF/classes directory (allowing the application to be loaded) are classpath roots. Hibernate is finding META-INF/orm.xml from both of these roots when I believe it should only be finding it from the latter.

You can reproduce the problem without creating a bundled application if you copy your orm.xml file into src/main/resources/foo/META-INF/orm.xml. If you wish to pursue this, I would recommend raising it with the Hibernate team.

[bahaa]

As a workaround, you can rename your orm.xml file and set its new path in your application.properties like this:

spring.jpa.mapping-resources=META-INF/orm-alternative-path.xml