legalStateException.html" title="class or interface in java.lang" class="external-link">IllegalStateException</a></code> - Thrown if the thread is already
    associated with another transaction.</dd>
<dd><code><a href="SystemException.html" title="class in jakarta.transaction">SystemException</a></code> - Thrown if the transaction manager
    encounters an unexpected error condition.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="rollback()">
<h3>rollback</h3>
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