">SystemException</a></code> - Thrown if the transaction manager
    encounters an unexpected error condition.</dd>
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<h4>rollback</h4>
<pre>void&nbsp;rollback()
       throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a>,
              <a href="https://docs.oracle.com/javase/8/docs/ap