I believe I have discovered an error in
org.apache.struts.taglib.html.FormTag.getActionMappingURL().
The following is the block of code with the error:
if (servletMapping.startsWith("*.")) {
value.append(actionMapping);
value.append(servletMapping.substring(1));
} else if (servletMapping.endsWith("/*")) {
value.append(servletMapping.substring(0,
servletMapping.length() - 2));
value.append(actionMapping);
}
The problem is simply that only 2 of the 3 cases for
servlet url-pattern mapping are handled. These 3
cases can be found on page 76 of the Servlet 2.3
specification (in section SRV.11.2). The 2 cases that
are handled by the above code block are url-patterns
starting with "/" and ending with "/*" and
url-patterns beginning with "*.". The one case that
is lacking is the one where the url-pattern is "/",
which is a pattern that indicates that the servlet is
the default servlet of the application.
So if one attempts to use the <html:form> JSP tag
while having the action servlet url-pattern set to
"/", an empty string is generated for the action
attribute of the resulting HTML <form> element.
To remedy this, something similar to the following
could be used to patch the block of code:
if (servletMapping.startsWith("*.")) {
value.append(actionMapping);
value.append(servletMapping.substring(1));
} else if (servletMapping.endsWith("/*")) {
value.append(servletMapping.substring(0,
servletMapping.length() - 2));
value.append(actionMapping);
} else if (servletMapping.equals("/")) {
value.append(actionMapping);
}
Best
Gabriel
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