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At work we have an entity library which is used by several clients for the library (several servlets, a desktop application, etc.). The entity library consists of JPA-Annotated classes and most prominently a persistence.xml.
All projects are configured using maven.
Where should a persistence.xml file be put? It needs to be located inside the jar file of that entity library and I'm not sure how to configure this using maven.
(We are just splitting up a project into several smaller projects)
'''UPDATE''' To be clear about this, there is one Maven-Project A containing the persistence.xml and another one (B) which depends on that Project. I've places persistence.xml in src/main/resources/META-INF/persistence.xml in A, when trying to use an EntityManager inside A, no problem, insidie B: nothing works.
EclipseLink gives the following Warning:
[EL Warning]: The collection of metamodel types is empty. Model classes may not have been found during entity search for Java SE and some Java EE container managed persistence units. Please verify that your entity classes are referenced in persistence.xml using either <class> elements or a global <exclude-unlisted-classes>false</exclude-unlisted-classes> element I suspect the persistence.xml is not found, but it is present in the target jar.
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If you package the persistence unit as a set of classes in a WAR file, persistence. xml should be located in the WAR file's WEB-INF/classes/META-INF directory.
The persistence. xml configuration file is used to configure a given JPA Persistence Unit. The Persistence Unit defines all the metadata required to bootstrap an EntityManagerFactory , like entity mappings, data source, and transaction settings, as well as JPA provider configuration properties.
The persistence. xml file is a standard configuration file in JPA. It has to be included in the META-INF directory inside the JAR file that contains the entity beans. The persistence. xml file must define a persistence-unit with a unique name in the current scoped classloader.
The Java Persistence API allows you to define multiple persistence units, each of which can map to a separate database.
As @Dave mentions above src/main/resources is the place. When it comes to persistence.xml it should be placed in the META-INF folder. So to conclude: src/main/resources/META-INF/persistence.xml.
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