No single default persistence unit defined

If you getting nowhere with this type of problem:

Using spring and jpa, and you get this error:

No single default persistence unit defined in {classpath*:META-INF/persistence.xml}

And you DO have a persistence.xml in your classpath.

Then the cause is simple.

You may have other persistence.xml files as well in your lib/jars.

Solution, add your persistenceUnitName to entityManager bean.


<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="persistenceUnitName" value="blahblahYourName" />

which matches the one in your persistence.xml


<persistence-unit name="blahblahYourName">

</persistence-unit>