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A quick search on the Net reveals three or four variants how folks have been specifying xmlns and xsi:schemaLocation in persistence.xml.
What would be the 'correct' manner to specify JPA version 2.1?
I'm using
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"> 
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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.
Right-click the file and click Upgrade document version. The persistence. xml file is upgraded to either version 2.0 or 2.1. Confirm the upgrade by opening the file in the Persistence XML editor and check that the version that displays is the one that you want.
persistence. xml is needed when you're using Hibernate through JPA, even though you're using Spring JPA. If you're using Hibernate directly, then persistence. xml isn't needed.
According to the official documentation it must be (like yours):
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1"> ... </persistence> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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