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There is a newer version: 8.9.0.37768

According to the Common Weakness Enumeration,
If two validation forms have the same name, the Struts Validator arbitrarily chooses one of the forms to use for input validation and discards the other. This decision might not correspond to the programmer's expectations...
In such a case, it is likely that the two forms should be combined. At the very least, one should be removed.

Noncompliant Code Example
<form-validation>
  <formset>
    <form name="BookForm"> ... </form>
    <form name="BookForm"> ... </form>  <!-- Noncompliant -->
  </formset>
</form-validation>


Compliant Solution
<form-validation>
  <formset>
    <form name="BookForm"> ... </form>
  </formset>
</form-validation>


See

 MITRE, CWE-102 - Struts: Duplicate Validation Forms
 OWASP, Improper Data Validation - Struts: Duplicate Validation Forms