neo4j + mysql in spring data transactions not working - mysql

Question

I am trying to build an application using both MySQL and neo4j.
Currently I succeed on saving an entity in both of the databases, but when I try to create a rollback only MySQL changes are rollbacked.
I'm not sure if the mode="proxy" configuration for the transactions can even work for neo4j, can someone approve/deny?
I'm using the #Transactional annotation over the relevant method, and I initiate a rollback by throwing a RuntimeException, which as I mentioned causes a rollback on MySQL.
My Configurations:
<neo4j:config graphDatabaseService="graphDatabaseService" entityManagerFactory="entityManagerFactory"/>
<bean id="graphDatabaseService" class="org.springframework.data.neo4j.rest.SpringRestGraphDatabase">
<constructor-arg index="0" value="http://localhost:7474/db/data"/>
</bean>
<context:annotation-config/>
<context:component-scan base-package="...">
<neo4j:repositories base-package="..."/>
<jpa:repositories base-package="..."
entity-manager-factory-ref="entityManagerFactory"
transaction-manager-ref="transactionManager"/>
<tx:annotation-driven mode="proxy" transaction-manager="transactionManager"/>
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="persistenceUnitName" value="hibernatePersistenceUnit"/>
<property name="packagesToScan" value="..."/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"/>
<property name="generateDdl" value="true"/>
<property name="database" value="MYSQL"/>
</bean>
</property>
</bean>
<!-- Database -->
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="java:comp/env/jdbc/..."/>
<property name="lookupOnStartup" value="true"/>
<property name="proxyInterface" value="javax.sql.DataSource"/>
</bean>
<!-- Declare a transaction manager-->
<bean id="transactionManager" class="org.springframework.data.transaction.ChainedTransactionManager">
<constructor-arg>
<list>
<ref bean="transactionManagerMysql"/>
<ref bean="transactionManagerNeo4j"/>
</list>
</constructor-arg>
</bean>
<bean id="transactionManagerMysql" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<bean id="transactionManagerNeo4j" class="org.springframework.data.neo4j.config.JtaTransactionManagerFactoryBean">
<constructor-arg ref="graphDatabaseService" />
</bean>