title: setting isolation level in spring annotation-based transactions
body: <p>I use in my project annotation-based transaction management (I annotate some methods with @Transactional). I would like to set the isolation level globally (not by putting it as an argument to each @Transactional annotation).</p>
  
  <p>Is it possible configure that in the XML? Currently my xml configuration contains</p>
  
  <pre><code>&lt;tx:annotation-driven transaction-manager="txManager"/&gt;
  &lt;bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"&gt;
     &lt;property name="dataSource" ref="dataSource" /&gt;
  &lt;/bean&gt;
  </code></pre>
  
  <p>Is it possible to add the isolation somehow to tx:annotation-driven?</p>