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The bean 'org.springframework.transaction.config.internalTransactionAdvisor' already registered

I have defined a trivial SpringBoot Hibernate app, copy-pasted from sample code found in a random site on the Internet. The hopefully relevant portions of my spring.xml look like this:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
... details ommitted ...
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
... details ommitted ...
<bean id="transactionManager"
    class="org.springframework.orm.hibernate5.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
Why do I get this error?
  
The bean
  'org.springframework.transaction.config.internalTransactionAdvisor',
  defined in class path resource
  [org/springframework/transaction/annotation/ProxyTransactionManagementConfiguration.class],
  could not be registered. A bean with that name has already been
  defined in null and overriding is disabled.
Other things I have already tried
Using org.springframework.jdbc.datasource.DataSourceTransactionManager - same error
Using org.springframework.orm.jpa.JpaTransactionManager - same error
Removing the transactionManager bean - ok my SpringBoot app works but now all my JUnit tests break
                Maybe check this answer, I was getting the same error after upgrading to Spring Boot 2.x from 1.5.xx : stackoverflow.com/questions/51367566/…
– lincolnadym
                Jul 16, 2019 at 16:27
                Came here after trying to migrate from SpringBoot 1.5.9 to 2.2.1. Trying @lincolnadym link...
– Jefferson Quesado
                Nov 18, 2019 at 20:00
        
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