H2 password issue after Upgrading to Hibernate 5

Question

I've just upgraded my project from Hibernate 4.2.8 to Hibernate 5.2.12.Final The only change in terms of configuration is the persistence provider, instead of org.hibernate.ejb.HibernatePersistence it's now org.hibernate.jpa.HibernatePersistenceProvider.

All of a sudden my Unit Tests which use H2 fail with:

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.h2.jdbc.JdbcSQLException: Wrong user name or password [28000-166]

Any idea what is causing it? My H2 configuration in the persistence.xml has not changed:

       <properties>
            <property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:MyDB;INIT=runscript from 'classpath:/com/camel/database.sql'" />
            <property name="javax.persistence.jdbc.user" value="SA" />
            <property name="javax.persistence.jdbc.password" value="" />

            <property name="hibernate.hbm2ddl.auto" value="none" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
            <property name="hibernate.cache.use_query_cache" value="true" />
            <property name="hibernate.max_fetch_depth" value="4" />
            <property name="hibernate.cache.use_second_level_cache" value="true" />
            <property name="hibernate.cache.use_query_cache" value="true" />
            <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory" />
        </properties>