app.datasource.url=jdbc:mysql://localhost/test
app.datasource.username=dbuser
app.datasource.password=dbpass
app.datasource.configuration.maximum-pool-size=30

@Autowired
private EntityManagerFactory entityManagerFactory;

@Bean
public PlatformTransactionManager jpaTransactionManager() {
    JpaTransactionManager jpaTransactionManager = new JpaTransactionManager(entityManagerFactory);
    return jpaTransactionManager;
}