Called getWriter() after getOutputStream()

Hello,

In resin-3.0.13. I'm getting Response.getWriter() called after
Response.getOutputStream(). According to the spec, both can't be
called?

http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/ServletResponse.html#getWriter()

"Either this method (getWriter()) or getOutputStream() may be called
to write the body, not both."

This is the test:
test/hello.jsp
test/WEB-INF/web.xml
test/WEB-INF/src/test/Filter
test/WEB-INF/src/test/Response

¿Will this affect me in any way?. I mean, if I skip the invalid state
exception checking in the Response.

Kind Regards,
Leandro.