Posta seu web.xml por favor, pois agora esta dando erro de mapeamento.
Meu Web XML
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Servlet</display-name>
<servlet>
<description>
</description>
<display-name>CadastroFornecedorServlet</display-name>
<servlet-name>CadastroFornecedorServlet</servlet-name>
<servlet-class>
CadastroFornecedorServlet</servlet-class>
</servlet>
<servlet>
<description>
</description>
<display-name>CadastroFornecedorS</display-name>
<servlet-name>CadastroFornecedorS</servlet-name>
<servlet-class>
Apresentacao.CadastroFornecedorS</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CadastroFornecedorServlet</servlet-name>
<url-pattern>/CadastroFornecedorServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CadastroFornecedorS</servlet-name>
<url-pattern>/CadastroFornecedorS</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
O erro ainda é o 404 ou apresenta outro erro?
Então eu Tirei no meu web.xml
<servlet>
<description>
</description>
<display-name>CadastroFornecedorS</display-name>
<servlet-name>CadastroFornecedorS</servlet-name>
<servlet-class>
Apresentacao.CadastroFornecedorS</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CadastroFornecedorServlet</servlet-name>
<url-pattern>/CadastroFornecedorServlet</url-pattern>
</servlet-mapping>
AGORA ESTÁ FUNCIONANDO
MUITO OBRIGADO PELA AJUDA VAGNER