In Spring/Hibernate/MySql, is autocommit true or false by default? - mysql

Question

I'm using a Amazon RDS MySql 5.5.37 server with another RDS read replica, mysql-connector-java-5.1.22-bin.jar, Spring 4.3.8.RELEASE and Hibernate 5.1.5.Final. I have my SPring/Hibernate configuration as such
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="packagesToScan" value="org.mainco.subco" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
</property>
<property name="dataSource" ref="dataSource"/>
<property name="jpaPropertyMap" ref="jpaPropertyMap" />
</bean>
<util:map id="jpaPropertyMap">
<entry key="hibernate.show_sql" value="false" />
<entry key="hibernate.hbm2ddl.auto" value="validate"/>
<entry key="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
<entry key="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTransactionManagerLookup" />
<entry key="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"/>
<entry key="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider"/>
<entry key="hibernate.cache.use_second_level_cache" value="${enable.hibernate.second_level.cache}" />
<entry key="hibernate.cache.use_query_cache" value="${enable.hibernate.query.cache}" />
<entry key="hibernate.generate_statistics" value="false" />
<entry key="hibernate.event.merge.entity_copy_observer" value="allow" />
<entry key="hibernate.enable_lazy_load_no_trans" value="true" />
</util:map>
<bean id="entityManager" class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<jee:jndi-lookup jndi-name="java:jboss/datasources/MySqlDS" id="dataSource" expected-type="javax.sql.DataSource"/>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
and below is how I set up my datasource in JBoss ...
<datasource jndi-name="java:jboss/datasources/MySqlDS" pool-name="MySqlDS" enabled="true" use-java-context="true">
<connection-url>jdbc:mysql:replication://cidb-aurora-cluster.cluster-dbserver.us-east-1.rds.amazonaws.com:3306,cidb-aurora-read.dbserver.us-east-1.rds.amazonaws.com:3306/dbsid?failOverReadOnly=true</connection-url>
<driver>mysql</driver>
<transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
<pool>
<min-pool-size>10</min-pool-size>
<max-pool-size>100</max-pool-size>
<prefill>true</prefill>
</pool>
<security>
<user-name>username</user-name>
<password>password</password>
</security>
<statement>
<prepared-statement-cache-size>32</prepared-statement-cache-size>
<share-prepared-statements>true</share-prepared-statements>
</statement>
</datasource>
<drivers>
<driver name="mysql" module="com.mysql">
<driver-class>com.mysql.jdbc.ReplicationDriver</driver-class>
</driver>
<driver name="h2" module="com.h2database.h2">
<xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>
</driver>
</drivers>
In my Java code, I mark my transactional service methods with the
org.springframework.transaction.annotation.Transactional
annotation. My question is, is autocommit enabled or disabled in as far as I haven't specified it? The next question is, what should the value be for autoCommit (true or false)?